Merge branch 'master' into sathieu/gitlab-ce-project_api

109 files changed, 4862 insertions, 3112 deletions

diff --git a/spec/controllers/dashboard/projects_controller_spec.rb b/spec/controllers/dashboard/projects_controller_spec.rb
index ea68eae12ed..6591901a9dc 100644
--- a/spec/controllers/dashboard/projects_controller_spec.rb
+++ b/spec/controllers/dashboard/projects_controller_spec.rb
@@ -11,8 +11,10 @@ describe Dashboard::ProjectsController do
     end
 
     context 'user logged in' do
+      let(:user) { create(:user) }
+
       before do
-        sign_in create(:user)
+        sign_in(user)
       end
 
       context 'external authorization' do
@@ -24,6 +26,20 @@ describe Dashboard::ProjectsController do
           expect(response).to have_gitlab_http_status(200)
         end
       end
+
+      it 'orders the projects by last activity by default' do
+        project = create(:project)
+        project.add_developer(user)
+        project.update!(last_repository_updated_at: 3.days.ago, last_activity_at: 3.days.ago)
+
+        project2 = create(:project)
+        project2.add_developer(user)
+        project2.update!(last_repository_updated_at: 10.days.ago, last_activity_at: 10.days.ago)
+
+        get :index
+
+        expect(assigns(:projects)).to eq([project, project2])
+      end
     end
   end
 
diff --git a/spec/controllers/projects/deployments_controller_spec.rb b/spec/controllers/projects/deployments_controller_spec.rb
index 95417936df4..b9ee69a617b 100644
--- a/spec/controllers/projects/deployments_controller_spec.rb
+++ b/spec/controllers/projects/deployments_controller_spec.rb
@@ -41,34 +41,26 @@ describe Projects::DeploymentsController do
   describe 'GET #metrics' do
     let(:deployment) { create(:deployment, :success, project: project, environment: environment) }
 
-    before do
-      allow(controller).to receive(:deployment).and_return(deployment)
-    end
-
     context 'when metrics are disabled' do
-      before do
-        allow(deployment).to receive(:has_metrics?).and_return false
-      end
-
       it 'responds with not found' do
-        get :metrics, params: deployment_params(id: deployment.id)
+        get :metrics, params: deployment_params(id: deployment.to_param)
 
         expect(response).to be_not_found
       end
     end
 
     context 'when metrics are enabled' do
-      before do
-        allow(deployment).to receive(:has_metrics?).and_return true
-      end
-
       context 'when environment has no metrics' do
         before do
-          expect(deployment).to receive(:metrics).and_return(nil)
+          expect_next_instance_of(DeploymentMetrics) do |deployment_metrics|
+            allow(deployment_metrics).to receive(:has_metrics?).and_return(true)
+
+            expect(deployment_metrics).to receive(:metrics).and_return(nil)
+          end
         end
 
         it 'returns a empty response 204 resposne' do
-          get :metrics, params: deployment_params(id: deployment.id)
+          get :metrics, params: deployment_params(id: deployment.to_param)
           expect(response).to have_gitlab_http_status(204)
           expect(response.body).to eq('')
         end
@@ -84,11 +76,15 @@ describe Projects::DeploymentsController do
         end
 
         before do
-          expect(deployment).to receive(:metrics).and_return(empty_metrics)
+          expect_next_instance_of(DeploymentMetrics) do |deployment_metrics|
+            allow(deployment_metrics).to receive(:has_metrics?).and_return(true)
+
+            expect(deployment_metrics).to receive(:metrics).and_return(empty_metrics)
+          end
         end
 
         it 'returns a metrics JSON document' do
-          get :metrics, params: deployment_params(id: deployment.id)
+          get :metrics, params: deployment_params(id: deployment.to_param)
 
           expect(response).to be_ok
           expect(json_response['success']).to be(true)
@@ -96,54 +92,32 @@ describe Projects::DeploymentsController do
           expect(json_response['last_update']).to eq(42)
         end
       end
-
-      context 'when metrics service does not implement deployment metrics' do
-        before do
-          allow(deployment).to receive(:metrics).and_raise(NotImplementedError)
-        end
-
-        it 'responds with not found' do
-          get :metrics, params: deployment_params(id: deployment.id)
-
-          expect(response).to be_not_found
-        end
-      end
     end
   end
 
   describe 'GET #additional_metrics' do
     let(:deployment) { create(:deployment, :success, project: project, environment: environment) }
 
-    before do
-      allow(controller).to receive(:deployment).and_return(deployment)
-    end
-
     context 'when metrics are disabled' do
-      before do
-        allow(deployment).to receive(:has_metrics?).and_return false
-      end
-
       it 'responds with not found' do
-        get :metrics, params: deployment_params(id: deployment.id)
+        get :metrics, params: deployment_params(id: deployment.to_param)
 
         expect(response).to be_not_found
       end
     end
 
     context 'when metrics are enabled' do
-      let(:prometheus_adapter) { double('prometheus_adapter', can_query?: true) }
-
-      before do
-        allow(deployment).to receive(:prometheus_adapter).and_return(prometheus_adapter)
-      end
-
       context 'when environment has no metrics' do
         before do
-          expect(deployment).to receive(:additional_metrics).and_return({})
+          expect_next_instance_of(DeploymentMetrics) do |deployment_metrics|
+            allow(deployment_metrics).to receive(:has_metrics?).and_return(true)
+
+            expect(deployment_metrics).to receive(:additional_metrics).and_return({})
+          end
         end
 
         it 'returns a empty response 204 response' do
-          get :additional_metrics, params: deployment_params(id: deployment.id, format: :json)
+          get :additional_metrics, params: deployment_params(id: deployment.to_param, format: :json)
           expect(response).to have_gitlab_http_status(204)
           expect(response.body).to eq('')
         end
@@ -159,11 +133,15 @@ describe Projects::DeploymentsController do
         end
 
         before do
-          expect(deployment).to receive(:additional_metrics).and_return(empty_metrics)
+          expect_next_instance_of(DeploymentMetrics) do |deployment_metrics|
+            allow(deployment_metrics).to receive(:has_metrics?).and_return(true)
+
+            expect(deployment_metrics).to receive(:additional_metrics).and_return(empty_metrics)
+          end
         end
 
         it 'returns a metrics JSON document' do
-          get :additional_metrics, params: deployment_params(id: deployment.id, format: :json)
+          get :additional_metrics, params: deployment_params(id: deployment.to_param, format: :json)
 
           expect(response).to be_ok
           expect(json_response['success']).to be(true)
diff --git a/spec/controllers/projects/merge_requests_controller_spec.rb b/spec/controllers/projects/merge_requests_controller_spec.rb
index 0eca663a683..9878f88a395 100644
--- a/spec/controllers/projects/merge_requests_controller_spec.rb
+++ b/spec/controllers/projects/merge_requests_controller_spec.rb
@@ -878,6 +878,22 @@ describe Projects::MergeRequestsController do
         expect(control_count).to be <= 137
       end
 
+      it 'has no N+1 issues for environments', :request_store, retry: 0 do
+        # First run to insert test data from lets, which does take up some 30 queries
+        get_ci_environments_status
+
+        control_count = ActiveRecord::QueryRecorder.new(skip_cached: false) { get_ci_environments_status }.count
+
+        environment2 = create(:environment, project: forked)
+        create(:deployment, :succeed, environment: environment2, sha: sha, ref: 'master', deployable: build)
+
+        # TODO address the last 11 queries
+        # See https://gitlab.com/gitlab-org/gitlab-ce/issues/63952 (5 queries)
+        # And https://gitlab.com/gitlab-org/gitlab-ce/issues/64105 (6 queries)
+        leeway = 11
+        expect { get_ci_environments_status }.not_to exceed_all_query_limit(control_count + leeway)
+      end
+
       def get_ci_environments_status(extra_params = {})
         params = {
           namespace_id: merge_request.project.namespace.to_param,
diff --git a/spec/controllers/projects_controller_spec.rb b/spec/controllers/projects_controller_spec.rb
index 8d2412f97ef..4e1cac67d23 100644
--- a/spec/controllers/projects_controller_spec.rb
+++ b/spec/controllers/projects_controller_spec.rb
@@ -318,6 +318,53 @@ describe ProjectsController do
     end
   end
 
+  describe '#housekeeping' do
+    let(:group) { create(:group) }
+    let(:project) { create(:project, group: group) }
+    let(:housekeeping) { Projects::HousekeepingService.new(project) }
+
+    context 'when authenticated as owner' do
+      before do
+        group.add_owner(user)
+        sign_in(user)
+
+        allow(Projects::HousekeepingService).to receive(:new).with(project, :gc).and_return(housekeeping)
+      end
+
+      it 'forces a full garbage collection' do
+        expect(housekeeping).to receive(:execute).once
+
+        post :housekeeping,
+             params: {
+               namespace_id: project.namespace.path,
+               id: project.path
+             }
+
+        expect(response).to have_gitlab_http_status(302)
+      end
+    end
+
+    context 'when authenticated as developer' do
+      let(:developer) { create(:user) }
+
+      before do
+        group.add_developer(developer)
+      end
+
+      it 'does not execute housekeeping' do
+        expect(housekeeping).not_to receive(:execute)
+
+        post :housekeeping,
+             params: {
+               namespace_id: project.namespace.path,
+               id: project.path
+             }
+
+        expect(response).to have_gitlab_http_status(302)
+      end
+    end
+  end
+
   describe "#update" do
     render_views
 
diff --git a/spec/features/admin/admin_sees_project_statistics_spec.rb b/spec/features/admin/admin_sees_project_statistics_spec.rb
index b5323a1c76d..ecd0aab925b 100644
--- a/spec/features/admin/admin_sees_project_statistics_spec.rb
+++ b/spec/features/admin/admin_sees_project_statistics_spec.rb
@@ -15,7 +15,7 @@ describe "Admin > Admin sees project statistics" do
     let(:project) { create(:project, :repository) }
 
     it "shows project statistics" do
-      expect(page).to have_content("Storage: 0 Bytes (0 Bytes repositories, 0 Bytes wikis, 0 Bytes build artifacts, 0 Bytes LFS)")
+      expect(page).to have_content("Storage: 0 Bytes (Repository: 0 Bytes / Wikis: 0 Bytes / Build Artifacts: 0 Bytes / LFS: 0 Bytes)")
     end
   end
 
diff --git a/spec/features/dashboard/shortcuts_spec.rb b/spec/features/dashboard/shortcuts_spec.rb
index 55f5ff04d01..254bb12573c 100644
--- a/spec/features/dashboard/shortcuts_spec.rb
+++ b/spec/features/dashboard/shortcuts_spec.rb
@@ -22,7 +22,7 @@ describe 'Dashboard shortcuts', :js do
 
       find('body').send_keys([:shift, 'T'])
 
-      check_page_title('Todos')
+      check_page_title('To-Do List')
 
       find('body').send_keys([:shift, 'P'])
 
diff --git a/spec/features/dashboard/todos/todos_spec.rb b/spec/features/dashboard/todos/todos_spec.rb
index d58e3b2841e..c48229fc0a0 100644
--- a/spec/features/dashboard/todos/todos_spec.rb
+++ b/spec/features/dashboard/todos/todos_spec.rb
@@ -13,7 +13,7 @@ describe 'Dashboard Todos' do
     end
 
     it 'shows "All done" message' do
-      expect(page).to have_content 'Todos let you see what you should do next'
+      expect(page).to have_content 'Your To-Do List shows what to work on next'
     end
   end
 
@@ -72,7 +72,7 @@ describe 'Dashboard Todos' do
       end
 
       it 'updates todo count' do
-        expect(page).to have_content 'Todos 0'
+        expect(page).to have_content 'To Do 0'
         expect(page).to have_content 'Done 1'
       end
 
@@ -101,7 +101,7 @@ describe 'Dashboard Todos' do
       end
 
       it 'updates todo count' do
-        expect(page).to have_content 'Todos 1'
+        expect(page).to have_content 'To Do 1'
         expect(page).to have_content 'Done 0'
       end
     end
@@ -211,7 +211,7 @@ describe 'Dashboard Todos' do
     describe 'restoring the todo' do
       before do
         within first('.todo') do
-          click_link 'Add todo'
+          click_link 'Add a To Do'
         end
       end
 
@@ -220,7 +220,7 @@ describe 'Dashboard Todos' do
       end
 
       it 'updates todo count' do
-        expect(page).to have_content 'Todos 1'
+        expect(page).to have_content 'To Do 1'
         expect(page).to have_content 'Done 0'
       end
     end
@@ -276,7 +276,7 @@ describe 'Dashboard Todos' do
       end
 
       it 'shows "All done" message!' do
-        expect(page).to have_content 'Todos 0'
+        expect(page).to have_content 'To Do 0'
         expect(page).to have_content "You're all done!"
         expect(page).not_to have_selector('.gl-pagination')
       end
@@ -303,7 +303,7 @@ describe 'Dashboard Todos' do
       it 'updates todo count' do
         mark_all_and_undo
 
-        expect(page).to have_content 'Todos 2'
+        expect(page).to have_content 'To Do 2'
         expect(page).to have_content 'Done 0'
       end
 
diff --git a/spec/features/issues/todo_spec.rb b/spec/features/issues/todo_spec.rb
index 0114178b9be..07ae159eef4 100644
--- a/spec/features/issues/todo_spec.rb
+++ b/spec/features/issues/todo_spec.rb
@@ -13,8 +13,8 @@ describe 'Manually create a todo item from issue', :js do
 
   it 'creates todo when clicking button' do
     page.within '.issuable-sidebar' do
-      click_button 'Add todo'
-      expect(page).to have_content 'Mark todo as done'
+      click_button 'Add a To Do'
+      expect(page).to have_content 'Mark as done'
     end
 
     page.within '.header-content .todos-count' do
@@ -30,8 +30,8 @@ describe 'Manually create a todo item from issue', :js do
 
   it 'marks a todo as done' do
     page.within '.issuable-sidebar' do
-      click_button 'Add todo'
-      click_button 'Mark todo as done'
+      click_button 'Add a To Do'
+      click_button 'Mark as done'
     end
 
     expect(page).to have_selector('.todos-count', visible: false)
diff --git a/spec/features/issues/user_creates_confidential_merge_request_spec.rb b/spec/features/issues/user_creates_confidential_merge_request_spec.rb
new file mode 100644
index 00000000000..7ae4af4667b
--- /dev/null
+++ b/spec/features/issues/user_creates_confidential_merge_request_spec.rb
@@ -0,0 +1,54 @@
+require 'rails_helper'
+
+describe 'User creates confidential merge request on issue page', :js do
+  include ProjectForksHelper
+
+  let(:user) { create(:user) }
+  let(:project) { create(:project, :repository, :public) }
+  let(:issue) { create(:issue, project: project, confidential: true) }
+
+  def visit_confidential_issue
+    sign_in(user)
+    visit project_issue_path(project, issue)
+    wait_for_requests
+  end
+
+  before do
+    project.add_developer(user)
+  end
+
+  context 'user has no private fork' do
+    before do
+      fork_project(project, user, repository: true)
+      visit_confidential_issue
+    end
+
+    it 'shows that user has no fork available' do
+      click_button 'Create confidential merge request'
+
+      page.within '.create-confidential-merge-request-dropdown-menu' do
+        expect(page).to have_content('No forks available to you')
+      end
+    end
+  end
+
+  describe 'user has private fork' do
+    let(:forked_project) { fork_project(project, user, repository: true) }
+
+    before do
+      forked_project.update(visibility: Gitlab::VisibilityLevel::PRIVATE)
+      visit_confidential_issue
+    end
+
+    it 'create merge request in fork' do
+      click_button 'Create confidential merge request'
+
+      page.within '.create-confidential-merge-request-dropdown-menu' do
+        expect(page).to have_button(forked_project.name_with_namespace)
+        click_button 'Create confidential merge request'
+      end
+
+      expect(page).to have_content(forked_project.namespace.name)
+    end
+  end
+end
diff --git a/spec/features/merge_request/user_sees_merge_widget_spec.rb b/spec/features/merge_request/user_sees_merge_widget_spec.rb
index 733e8aa3eba..30e30751693 100644
--- a/spec/features/merge_request/user_sees_merge_widget_spec.rb
+++ b/spec/features/merge_request/user_sees_merge_widget_spec.rb
@@ -519,6 +519,8 @@ describe 'Merge request > User sees merge widget', :js do
       end
 
       before do
+        allow_any_instance_of(TestSuiteComparerEntity)
+          .to receive(:max_tests).and_return(2)
         allow_any_instance_of(MergeRequest)
           .to receive(:has_test_reports?).and_return(true)
         allow_any_instance_of(MergeRequest)
@@ -551,7 +553,7 @@ describe 'Merge request > User sees merge widget', :js do
               expect(page).to have_content('rspec found no changed test results out of 1 total test')
               expect(page).to have_content('junit found 1 failed test result out of 1 total test')
               expect(page).to have_content('New')
-              expect(page).to have_content('subtractTest')
+              expect(page).to have_content('addTest')
             end
           end
         end
@@ -562,7 +564,7 @@ describe 'Merge request > User sees merge widget', :js do
               click_button 'Expand'
 
               within(".js-report-section-container") do
-                click_button 'subtractTest'
+                click_button 'addTest'
 
                 expect(page).to have_content('6.66')
                 expect(page).to have_content(sample_java_failed_message.gsub!(/\s+/, ' ').strip)
@@ -596,7 +598,7 @@ describe 'Merge request > User sees merge widget', :js do
               expect(page).to have_content('rspec found 1 failed test result out of 1 total test')
               expect(page).to have_content('junit found no changed test results out of 1 total test')
               expect(page).not_to have_content('New')
-              expect(page).to have_content('Test#sum when a is 2 and b is 2 returns summary')
+              expect(page).to have_content('Test#sum when a is 1 and b is 3 returns summary')
             end
           end
         end
@@ -607,7 +609,7 @@ describe 'Merge request > User sees merge widget', :js do
               click_button 'Expand'
 
               within(".js-report-section-container") do
-                click_button 'Test#sum when a is 2 and b is 2 returns summary'
+                click_button 'Test#sum when a is 1 and b is 3 returns summary'
 
                 expect(page).to have_content('2.22')
                 expect(page).to have_content(sample_rspec_failed_message.gsub!(/\s+/, ' ').strip)
@@ -628,13 +630,7 @@ describe 'Merge request > User sees merge widget', :js do
         let(:head_reports) do
           Gitlab::Ci::Reports::TestReports.new.tap do |reports|
             reports.get_suite('rspec').add_test_case(create_test_case_rspec_success)
-            reports.get_suite('junit').add_test_case(create_test_case_java_resolved)
-          end
-        end
-
-        let(:create_test_case_java_resolved) do
-          create_test_case_java_failed.tap do |test_case|
-            test_case.instance_variable_set("@status", Gitlab::Ci::Reports::TestCase::STATUS_SUCCESS)
+            reports.get_suite('junit').add_test_case(create_test_case_java_success)
           end
         end
 
@@ -646,7 +642,7 @@ describe 'Merge request > User sees merge widget', :js do
             within(".js-report-section-container") do
               expect(page).to have_content('rspec found no changed test results out of 1 total test')
               expect(page).to have_content('junit found 1 fixed test result out of 1 total test')
-              expect(page).to have_content('subtractTest')
+              expect(page).to have_content('addTest')
             end
           end
         end
@@ -657,15 +653,53 @@ describe 'Merge request > User sees merge widget', :js do
               click_button 'Expand'
 
               within(".js-report-section-container") do
-                click_button 'subtractTest'
+                click_button 'addTest'
 
-                expect(page).to have_content('6.66')
+                expect(page).to have_content('5.55')
               end
             end
           end
         end
       end
 
+      context 'properly truncates the report' do
+        let(:base_reports) do
+          Gitlab::Ci::Reports::TestReports.new.tap do |reports|
+            10.times do |index|
+              reports.get_suite('rspec').add_test_case(
+                create_test_case_rspec_failed(index))
+              reports.get_suite('junit').add_test_case(
+                create_test_case_java_success(index))
+            end
+          end
+        end
+
+        let(:head_reports) do
+          Gitlab::Ci::Reports::TestReports.new.tap do |reports|
+            10.times do |index|
+              reports.get_suite('rspec').add_test_case(
+                create_test_case_rspec_failed(index))
+              reports.get_suite('junit').add_test_case(
+                create_test_case_java_failed(index))
+            end
+          end
+        end
+
+        it 'shows test reports summary which includes the resolved failure' do
+          within(".js-reports-container") do
+            click_button 'Expand'
+
+            expect(page).to have_content('Test summary contained 20 failed test results out of 20 total tests')
+            within(".js-report-section-container") do
+              expect(page).to have_content('rspec found 10 failed test results out of 10 total tests')
+              expect(page).to have_content('junit found 10 failed test results out of 10 total tests')
+
+              expect(page).to have_content('Test#sum when a is 1 and b is 3 returns summary', count: 2)
+            end
+          end
+        end
+      end
+
       def comparer
         Gitlab::Ci::Reports::TestReportsComparer.new(base_reports, head_reports)
       end
diff --git a/spec/features/oauth_login_spec.rb b/spec/features/oauth_login_spec.rb
index 5ebfc32952d..86331728f88 100644
--- a/spec/features/oauth_login_spec.rb
+++ b/spec/features/oauth_login_spec.rb
@@ -16,16 +16,8 @@ describe 'OAuth Login', :js, :allow_forgery_protection do
   providers = [:github, :twitter, :bitbucket, :gitlab, :google_oauth2,
                :facebook, :cas3, :auth0, :authentiq, :salesforce]
 
-  before(:all) do
-    # The OmniAuth `full_host` parameter doesn't get set correctly (it gets set to something like `http://localhost`
-    # here), and causes integration tests to fail with 404s. We set the `full_host` by removing the request path (and
-    # anything after it) from the request URI.
-    @omniauth_config_full_host = OmniAuth.config.full_host
-    OmniAuth.config.full_host = ->(request) { request['REQUEST_URI'].sub(/#{request['REQUEST_PATH']}.*/, '') }
-  end
-
-  after(:all) do
-    OmniAuth.config.full_host = @omniauth_config_full_host
+  around(:all) do |example|
+    with_omniauth_full_host { example.run }
   end
 
   def login_with_provider(provider, enter_two_factor: false)
diff --git a/spec/features/search/user_uses_header_search_field_spec.rb b/spec/features/search/user_uses_header_search_field_spec.rb
index 1cc47cd6bd1..7ddd5c12cdf 100644
--- a/spec/features/search/user_uses_header_search_field_spec.rb
+++ b/spec/features/search/user_uses_header_search_field_spec.rb
@@ -1,6 +1,6 @@
 require 'spec_helper'
 
-describe 'User uses header search field' do
+describe 'User uses header search field', :js do
   include FilteredSearchHelpers
 
   let(:project) { create(:project) }
@@ -11,57 +11,12 @@ describe 'User uses header search field' do
     sign_in(user)
   end
 
-  context 'when user is in a global scope', :js do
+  shared_examples 'search field examples' do
     before do
-      visit(root_path)
-      page.find('#search').click
+      visit(url)
     end
 
-    context 'when clicking issues' do
-      it 'shows assigned issues' do
-        find('.search-input-container .dropdown-menu').click_link('Issues assigned to me')
-
-        expect(page).to have_selector('.filtered-search')
-        expect_tokens([assignee_token(user.name)])
-        expect_filtered_search_input_empty
-      end
-
-      it 'shows created issues' do
-        find('.search-input-container .dropdown-menu').click_link("Issues I've created")
-
-        expect(page).to have_selector('.filtered-search')
-        expect_tokens([author_token(user.name)])
-        expect_filtered_search_input_empty
-      end
-    end
-
-    context 'when clicking merge requests' do
-      let!(:merge_request) { create(:merge_request, source_project: project, author: user, assignees: [user]) }
-
-      it 'shows assigned merge requests' do
-        find('.search-input-container .dropdown-menu').click_link('Merge requests assigned to me')
-
-        expect(page).to have_selector('.filtered-search')
-        expect_tokens([assignee_token(user.name)])
-        expect_filtered_search_input_empty
-      end
-
-      it 'shows created merge requests' do
-        find('.search-input-container .dropdown-menu').click_link("Merge requests I've created")
-
-        expect(page).to have_selector('.filtered-search')
-        expect_tokens([author_token(user.name)])
-        expect_filtered_search_input_empty
-      end
-    end
-  end
-
-  context 'when user is in a project scope' do
-    before do
-      visit(project_path(project))
-    end
-
-    it 'starts searching by pressing the enter key', :js do
+    it 'starts searching by pressing the enter key' do
       fill_in('search', with: 'gitlab')
       find('#search').native.send_keys(:enter)
 
@@ -70,30 +25,31 @@ describe 'User uses header search field' do
       end
     end
 
-    context 'when clicking the search field', :js do
+    context 'when clicking the search field' do
       before do
         page.find('#search').click
+        wait_for_all_requests
       end
 
       it 'shows category search dropdown' do
-        expect(page).to have_selector('.dropdown-header', text: /#{project.name}/i)
+        expect(page).to have_selector('.dropdown-header', text: /#{scope_name}/i)
       end
 
       context 'when clicking issues' do
         let!(:issue) { create(:issue, project: project, author: user, assignees: [user]) }
 
         it 'shows assigned issues' do
-          find('.dropdown-menu').click_link('Issues assigned to me')
+          find('.search-input-container .dropdown-menu').click_link('Issues assigned to me')
 
-          expect(page).to have_selector('.filtered-search')
+          expect(page).to have_selector('.issues-list .issue')
           expect_tokens([assignee_token(user.name)])
           expect_filtered_search_input_empty
         end
 
         it 'shows created issues' do
-          find('.dropdown-menu').click_link("Issues I've created")
+          find('.search-input-container .dropdown-menu').click_link("Issues I've created")
 
-          expect(page).to have_selector('.filtered-search')
+          expect(page).to have_selector('.issues-list .issue')
           expect_tokens([author_token(user.name)])
           expect_filtered_search_input_empty
         end
@@ -103,33 +59,77 @@ describe 'User uses header search field' do
         let!(:merge_request) { create(:merge_request, source_project: project, author: user, assignees: [user]) }
 
         it 'shows assigned merge requests' do
-          find('.dropdown-menu').click_link('Merge requests assigned to me')
+          find('.search-input-container .dropdown-menu').click_link('Merge requests assigned to me')
 
-          expect(page).to have_selector('.merge-requests-holder')
+          expect(page).to have_selector('.mr-list .merge-request')
           expect_tokens([assignee_token(user.name)])
           expect_filtered_search_input_empty
         end
 
         it 'shows created merge requests' do
-          find('.dropdown-menu').click_link("Merge requests I've created")
+          find('.search-input-container .dropdown-menu').click_link("Merge requests I've created")
 
-          expect(page).to have_selector('.merge-requests-holder')
+          expect(page).to have_selector('.mr-list .merge-request')
           expect_tokens([author_token(user.name)])
           expect_filtered_search_input_empty
         end
       end
     end
 
-    context 'when entering text into the search field', :js do
+    context 'when entering text into the search field' do
       before do
         page.within('.search-input-wrap') do
-          fill_in('search', with: project.name[0..3])
+          fill_in('search', with: scope_name.first(4))
         end
       end
 
       it 'does not display the category search dropdown' do
-        expect(page).not_to have_selector('.dropdown-header', text: /#{project.name}/i)
+        expect(page).not_to have_selector('.dropdown-header', text: /#{scope_name}/i)
       end
     end
   end
+
+  context 'when user is in a global scope' do
+    include_examples 'search field examples' do
+      let(:url) { root_path }
+      let(:scope_name) { 'All GitLab' }
+    end
+  end
+
+  context 'when user is in a project scope' do
+    include_examples 'search field examples' do
+      let(:url) { project_path(project) }
+      let(:scope_name) { project.name }
+    end
+  end
+
+  context 'when user is in a group scope' do
+    let(:group) { create(:group) }
+    let(:project) { create(:project, namespace: group) }
+
+    before do
+      group.add_maintainer(user)
+    end
+
+    include_examples 'search field examples' do
+      let(:url) { group_path(group) }
+      let(:scope_name) { group.name }
+    end
+  end
+
+  context 'when user is in a subgroup scope' do
+    let(:group) { create(:group) }
+    let(:subgroup) { create(:group, :public, parent: group) }
+    let(:project) { create(:project, namespace: subgroup) }
+
+    before do
+      group.add_owner(user)
+      subgroup.add_owner(user)
+    end
+
+    include_examples 'search field examples' do
+      let(:url) { group_path(subgroup) }
+      let(:scope_name) { subgroup.name }
+    end
+  end
 end
diff --git a/spec/finders/runner_jobs_finder_spec.rb b/spec/finders/runner_jobs_finder_spec.rb
index 97304170c4e..01f45a37ba8 100644
--- a/spec/finders/runner_jobs_finder_spec.rb
+++ b/spec/finders/runner_jobs_finder_spec.rb
@@ -35,5 +35,27 @@ describe RunnerJobsFinder do
         end
       end
     end
+
+    context 'when order_by and sort are specified' do
+      context 'when order_by id and sort is asc' do
+        let(:params) { { order_by: 'id', sort: 'asc' } }
+        let!(:jobs) { create_list(:ci_build, 2, runner: runner, project: project, user: create(:user)) }
+
+        it 'sorts as id: :asc' do
+          is_expected.to eq(jobs.sort_by(&:id))
+        end
+      end
+    end
+
+    context 'when order_by is specified and sort is not specified' do
+      context 'when order_by id and sort is not specified' do
+        let(:params) { { order_by: 'id' } }
+        let!(:jobs) { create_list(:ci_build, 2, runner: runner, project: project, user: create(:user)) }
+
+        it 'sorts as id: :desc' do
+          is_expected.to eq(jobs.sort_by(&:id).reverse)
+        end
+      end
+    end
   end
 end
diff --git a/spec/frontend/api_spec.js b/spec/frontend/api_spec.js
index 0188d12a57d..7004373be0e 100644
--- a/spec/frontend/api_spec.js
+++ b/spec/frontend/api_spec.js
@@ -412,6 +412,22 @@ describe('Api', () => {
     });
   });
 
+  describe('user counts', () => {
+    it('fetches single user counts', done => {
+      const expectedUrl = `${dummyUrlRoot}/api/${dummyApiVersion}/user_counts`;
+      mock.onGet(expectedUrl).reply(200, {
+        merge_requests: 4,
+      });
+
+      Api.userCounts()
+        .then(({ data }) => {
+          expect(data.merge_requests).toBe(4);
+        })
+        .then(done)
+        .catch(done.fail);
+    });
+  });
+
   describe('user status', () => {
     it('fetches single user status', done => {
       const userId = '123456';
diff --git a/spec/frontend/boards/services/board_service_spec.js b/spec/frontend/boards/services/board_service_spec.js
index de9fc998360..a8a322e7237 100644
--- a/spec/frontend/boards/services/board_service_spec.js
+++ b/spec/frontend/boards/services/board_service_spec.js
@@ -2,6 +2,7 @@ import BoardService from '~/boards/services/board_service';
 import { TEST_HOST } from 'helpers/test_constants';
 import AxiosMockAdapter from 'axios-mock-adapter';
 import axios from '~/lib/utils/axios_utils';
+import boardsStore from '~/boards/stores/boards_store';
 
 describe('BoardService', () => {
   const dummyResponse = "without type checking this doesn't matter";
@@ -18,10 +19,11 @@ describe('BoardService', () => {
 
   beforeEach(() => {
     axiosMock = new AxiosMockAdapter(axios);
-    service = new BoardService({
+    boardsStore.setEndpoints({
       ...endpoints,
       boardId,
     });
+    service = new BoardService();
   });
 
   describe('all', () => {
diff --git a/spec/frontend/branches/divergence_graph_spec.js b/spec/frontend/branches/divergence_graph_spec.js
index 4ed77c3a036..8283bc966e4 100644
--- a/spec/frontend/branches/divergence_graph_spec.js
+++ b/spec/frontend/branches/divergence_graph_spec.js
@@ -10,12 +10,14 @@ describe('Divergence graph', () => {
 
     mock.onGet('/-/diverging_counts').reply(200, {
       master: { ahead: 1, behind: 1 },
+      'test/hello-world': { ahead: 1, behind: 1 },
     });
 
     jest.spyOn(axios, 'get');
 
     document.body.innerHTML = `
-      <div class="js-branch-item" data-name="master"></div>
+      <div class="js-branch-item" data-name="master"><div class="js-branch-divergence-graph"></div></div>
+      <div class="js-branch-item" data-name="test/hello-world"><div class="js-branch-divergence-graph"></div></div>
     `;
   });
 
@@ -26,7 +28,13 @@ describe('Divergence graph', () => {
   it('calls axos get with list of branch names', () =>
     init('/-/diverging_counts').then(() => {
       expect(axios.get).toHaveBeenCalledWith('/-/diverging_counts', {
-        params: { names: ['master'] },
+        params: { names: ['master', 'test/hello-world'] },
       });
     }));
+
+  it('creates Vue components', () =>
+    init('/-/diverging_counts').then(() => {
+      expect(document.querySelector('[data-name="master"]').innerHTML).not.toEqual('');
+      expect(document.querySelector('[data-name="test/hello-world"]').innerHTML).not.toEqual('');
+    }));
 });
diff --git a/spec/frontend/commons/nav/user_merge_requests_spec.js b/spec/frontend/commons/nav/user_merge_requests_spec.js
new file mode 100644
index 00000000000..4da6d53557a
--- /dev/null
+++ b/spec/frontend/commons/nav/user_merge_requests_spec.js
@@ -0,0 +1,113 @@
+import {
+  openUserCountsBroadcast,
+  closeUserCountsBroadcast,
+  refreshUserMergeRequestCounts,
+} from '~/commons/nav/user_merge_requests';
+import Api from '~/api';
+
+jest.mock('~/api');
+
+const TEST_COUNT = 1000;
+const MR_COUNT_CLASS = 'merge-requests-count';
+
+describe('User Merge Requests', () => {
+  let channelMock;
+  let newBroadcastChannelMock;
+
+  beforeEach(() => {
+    global.gon.current_user_id = 123;
+
+    channelMock = {
+      postMessage: jest.fn(),
+      close: jest.fn(),
+    };
+    newBroadcastChannelMock = jest.fn().mockImplementation(() => channelMock);
+
+    global.BroadcastChannel = newBroadcastChannelMock;
+    setFixtures(`<div class="${MR_COUNT_CLASS}">0</div>`);
+  });
+
+  const findMRCountText = () => document.body.querySelector(`.${MR_COUNT_CLASS}`).textContent;
+
+  describe('refreshUserMergeRequestCounts', () => {
+    beforeEach(() => {
+      Api.userCounts.mockReturnValue(
+        Promise.resolve({
+          data: { merge_requests: TEST_COUNT },
+        }),
+      );
+    });
+
+    describe('with open broadcast channel', () => {
+      beforeEach(() => {
+        openUserCountsBroadcast();
+
+        return refreshUserMergeRequestCounts();
+      });
+
+      it('updates the top count of merge requests', () => {
+        expect(findMRCountText()).toEqual(TEST_COUNT.toLocaleString());
+      });
+
+      it('calls the API', () => {
+        expect(Api.userCounts).toHaveBeenCalled();
+      });
+
+      it('posts count to BroadcastChannel', () => {
+        expect(channelMock.postMessage).toHaveBeenCalledWith(TEST_COUNT);
+      });
+    });
+
+    describe('without open broadcast channel', () => {
+      beforeEach(() => refreshUserMergeRequestCounts());
+
+      it('does not post anything', () => {
+        expect(channelMock.postMessage).not.toHaveBeenCalled();
+      });
+    });
+  });
+
+  describe('openUserCountsBroadcast', () => {
+    beforeEach(() => {
+      openUserCountsBroadcast();
+    });
+
+    it('creates BroadcastChannel that updates DOM on message received', () => {
+      expect(findMRCountText()).toEqual('0');
+
+      channelMock.onmessage({ data: TEST_COUNT });
+
+      expect(findMRCountText()).toEqual(TEST_COUNT.toLocaleString());
+    });
+
+    it('closes if called while already open', () => {
+      expect(channelMock.close).not.toHaveBeenCalled();
+
+      openUserCountsBroadcast();
+
+      expect(channelMock.close).toHaveBeenCalled();
+    });
+  });
+
+  describe('closeUserCountsBroadcast', () => {
+    describe('when not opened', () => {
+      it('does nothing', () => {
+        expect(channelMock.close).not.toHaveBeenCalled();
+      });
+    });
+
+    describe('when opened', () => {
+      beforeEach(() => {
+        openUserCountsBroadcast();
+      });
+
+      it('closes', () => {
+        expect(channelMock.close).not.toHaveBeenCalled();
+
+        closeUserCountsBroadcast();
+
+        expect(channelMock.close).toHaveBeenCalled();
+      });
+    });
+  });
+});
diff --git a/spec/frontend/confidential_merge_request/components/__snapshots__/project_form_group_spec.js.snap b/spec/frontend/confidential_merge_request/components/__snapshots__/project_form_group_spec.js.snap
new file mode 100644
index 00000000000..fd307ce5ab3
--- /dev/null
+++ b/spec/frontend/confidential_merge_request/components/__snapshots__/project_form_group_spec.js.snap
@@ -0,0 +1,67 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`Confidential merge request project form group component renders empty state when response is empty 1`] = `
+<div
+  class="form-group"
+>
+  <label>
+    Project
+  </label>
+   
+  <div>
+    <!---->
+     
+    <p
+      class="text-muted mt-1 mb-0"
+    >
+      
+        No forks available to you.
+      <br />
+       
+      <span>
+        To protect this issue's confidentiality, 
+        <a
+          class="help-link"
+          href="https://test.com"
+        >
+          fork the project
+        </a>
+         and set the forks visiblity to private.
+      </span>
+    </p>
+  </div>
+</div>
+`;
+
+exports[`Confidential merge request project form group component renders fork dropdown 1`] = `
+<div
+  class="form-group"
+>
+  <label>
+    Project
+  </label>
+   
+  <div>
+    <!---->
+     
+    <p
+      class="text-muted mt-1 mb-0"
+    >
+      
+        No forks available to you.
+      <br />
+       
+      <span>
+        To protect this issue's confidentiality, 
+        <a
+          class="help-link"
+          href="https://test.com"
+        >
+          fork the project
+        </a>
+         and set the forks visiblity to private.
+      </span>
+    </p>
+  </div>
+</div>
+`;
diff --git a/spec/frontend/confidential_merge_request/components/dropdown_spec.js b/spec/frontend/confidential_merge_request/components/dropdown_spec.js
new file mode 100644
index 00000000000..69495f3c161
--- /dev/null
+++ b/spec/frontend/confidential_merge_request/components/dropdown_spec.js
@@ -0,0 +1,56 @@
+import { mount } from '@vue/test-utils';
+import { GlDropdownItem } from '@gitlab/ui';
+import Dropdown from '~/confidential_merge_request/components/dropdown.vue';
+
+let vm;
+
+function factory(projects = []) {
+  vm = mount(Dropdown, {
+    propsData: {
+      projects,
+      selectedProject: projects[0],
+    },
+  });
+}
+
+describe('Confidential merge request project dropdown component', () => {
+  afterEach(() => {
+    vm.destroy();
+  });
+
+  it('renders dropdown items', () => {
+    factory([
+      {
+        id: 1,
+        name: 'test',
+      },
+      {
+        id: 2,
+        name: 'test',
+      },
+    ]);
+
+    expect(vm.findAll(GlDropdownItem).length).toBe(2);
+  });
+
+  it('renders selected project icon', () => {
+    factory([
+      {
+        id: 1,
+        name: 'test',
+      },
+      {
+        id: 2,
+        name: 'test 2',
+      },
+    ]);
+
+    expect(vm.find('.js-active-project-check').classes()).not.toContain('icon');
+    expect(
+      vm
+        .findAll('.js-active-project-check')
+        .at(1)
+        .classes(),
+    ).toContain('icon');
+  });
+});
diff --git a/spec/frontend/confidential_merge_request/components/project_form_group_spec.js b/spec/frontend/confidential_merge_request/components/project_form_group_spec.js
new file mode 100644
index 00000000000..3001363f7b9
--- /dev/null
+++ b/spec/frontend/confidential_merge_request/components/project_form_group_spec.js
@@ -0,0 +1,77 @@
+import { shallowMount, createLocalVue } from '@vue/test-utils';
+import MockAdapter from 'axios-mock-adapter';
+import axios from '~/lib/utils/axios_utils';
+import ProjectFormGroup from '~/confidential_merge_request/components/project_form_group.vue';
+
+const localVue = createLocalVue();
+const mockData = [
+  {
+    id: 1,
+    name_with_namespace: 'root / gitlab-ce',
+    path_with_namespace: 'root/gitlab-ce',
+    namespace: {
+      full_path: 'root',
+    },
+  },
+  {
+    id: 2,
+    name_with_namespace: 'test / gitlab-ce',
+    path_with_namespace: 'test/gitlab-ce',
+    namespace: {
+      full_path: 'test',
+    },
+  },
+];
+let vm;
+let mock;
+
+function factory(projects = mockData) {
+  mock = new MockAdapter(axios);
+  mock.onGet(/api\/(.*)\/projects\/gitlab-org%2Fgitlab-ce\/forks/).reply(200, projects);
+
+  vm = shallowMount(ProjectFormGroup, {
+    localVue,
+    propsData: {
+      namespacePath: 'gitlab-org',
+      projectPath: 'gitlab-org/gitlab-ce',
+      newForkPath: 'https://test.com',
+      helpPagePath: '/help',
+    },
+  });
+}
+
+describe('Confidential merge request project form group component', () => {
+  afterEach(() => {
+    mock.restore();
+    vm.destroy();
+  });
+
+  it('renders fork dropdown', () => {
+    factory();
+
+    return localVue.nextTick(() => {
+      expect(vm.element).toMatchSnapshot();
+    });
+  });
+
+  it('sets selected project as first fork', () => {
+    factory();
+
+    return localVue.nextTick(() => {
+      expect(vm.vm.selectedProject).toEqual({
+        id: 1,
+        name: 'root / gitlab-ce',
+        pathWithNamespace: 'root/gitlab-ce',
+        namespaceFullpath: 'root',
+      });
+    });
+  });
+
+  it('renders empty state when response is empty', () => {
+    factory([]);
+
+    return localVue.nextTick(() => {
+      expect(vm.element).toMatchSnapshot();
+    });
+  });
+});
diff --git a/spec/javascripts/create_merge_request_dropdown_spec.js b/spec/frontend/create_merge_request_dropdown_spec.js
index 00fe3f451f5..6e41fdabdce 100644
--- a/spec/javascripts/create_merge_request_dropdown_spec.js
+++ b/spec/frontend/create_merge_request_dropdown_spec.js
@@ -1,7 +1,7 @@
 import axios from '~/lib/utils/axios_utils';
 import MockAdapter from 'axios-mock-adapter';
 import CreateMergeRequestDropdown from '~/create_merge_request_dropdown';
-import { TEST_HOST } from 'spec/test_constants';
+import { TEST_HOST } from './helpers/test_constants';
 
 describe('CreateMergeRequestDropdown', () => {
   let axiosMock;
@@ -10,7 +10,7 @@ describe('CreateMergeRequestDropdown', () => {
   beforeEach(() => {
     axiosMock = new MockAdapter(axios);
 
-    setFixtures(`
+    document.body.innerHTML = `
       <div id="dummy-wrapper-element">
         <div class="available"></div>
         <div class="unavailable">
@@ -18,11 +18,12 @@ describe('CreateMergeRequestDropdown', () => {
           <div class="text"></div>
         </div>
         <div class="js-ref"></div>
+        <div class="js-create-mr"></div>
         <div class="js-create-merge-request"></div>
         <div class="js-create-target"></div>
         <div class="js-dropdown-toggle"></div>
       </div>
-    `);
+    `;
 
     const dummyElement = document.getElementById('dummy-wrapper-element');
     dropdown = new CreateMergeRequestDropdown(dummyElement);
@@ -36,7 +37,7 @@ describe('CreateMergeRequestDropdown', () => {
   describe('getRef', () => {
     it('escapes branch names correctly', done => {
       const endpoint = `${dropdown.refsPath}contains%23hash`;
-      spyOn(axios, 'get').and.callThrough();
+      jest.spyOn(axios, 'get');
       axiosMock.onGet(endpoint).replyOnce({});
 
       dropdown
diff --git a/spec/frontend/ide/lib/files_spec.js b/spec/frontend/ide/lib/files_spec.js
index aa1fa0373db..08a31318544 100644
--- a/spec/frontend/ide/lib/files_spec.js
+++ b/spec/frontend/ide/lib/files_spec.js
@@ -12,6 +12,7 @@ const createEntries = paths => {
 
     const { name, parent } = splitParent(path);
     const parentEntry = acc[parent];
+    const previewMode = viewerInformationForPath(name);
 
     acc[path] = {
       ...decorateData({
@@ -22,7 +23,8 @@ const createEntries = paths => {
         path,
         url: createUrl(`/${TEST_PROJECT_ID}/${type}/${TEST_BRANCH_ID}/-/${escapeFileUrl(path)}`),
         type,
-        previewMode: viewerInformationForPath(path),
+        previewMode,
+        binary: (previewMode && previewMode.binary) || false,
         parentPath: parent,
         parentTreeUrl: parentEntry
           ? parentEntry.url
diff --git a/spec/frontend/monitoring/__snapshots__/dashboard_state_spec.js.snap b/spec/frontend/monitoring/__snapshots__/dashboard_state_spec.js.snap
new file mode 100644
index 00000000000..5f24bab600c
--- /dev/null
+++ b/spec/frontend/monitoring/__snapshots__/dashboard_state_spec.js.snap
@@ -0,0 +1,37 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`EmptyState shows gettingStarted state 1`] = `
+<glemptystate-stub
+  description="Stay updated about the performance and health of your environment by configuring Prometheus to monitor your deployments."
+  primarybuttonlink="/clustersPath"
+  primarybuttontext="Install on clusters"
+  secondarybuttonlink="/settingsPath"
+  secondarybuttontext="Configure existing installation"
+  svgpath="/path/to/getting-started.svg"
+  title="Get started with performance monitoring"
+/>
+`;
+
+exports[`EmptyState shows loading state 1`] = `
+<glemptystate-stub
+  description="Creating graphs uses the data from the Prometheus server. If this takes a long time, ensure that data is available."
+  primarybuttonlink="/documentationPath"
+  primarybuttontext="View documentation"
+  secondarybuttonlink=""
+  secondarybuttontext=""
+  svgpath="/path/to/loading.svg"
+  title="Waiting for performance data"
+/>
+`;
+
+exports[`EmptyState shows unableToConnect state 1`] = `
+<glemptystate-stub
+  description="Ensure connectivity is available from the GitLab server to the Prometheus server"
+  primarybuttonlink="/documentationPath"
+  primarybuttontext="View documentation"
+  secondarybuttonlink="/settingsPath"
+  secondarybuttontext="Configure Prometheus"
+  svgpath="/path/to/unable-to-connect.svg"
+  title="Unable to connect to Prometheus server"
+/>
+`;
diff --git a/spec/frontend/monitoring/dashboard_state_spec.js b/spec/frontend/monitoring/dashboard_state_spec.js
new file mode 100644
index 00000000000..950422911eb
--- /dev/null
+++ b/spec/frontend/monitoring/dashboard_state_spec.js
@@ -0,0 +1,43 @@
+import { shallowMount } from '@vue/test-utils';
+import EmptyState from '~/monitoring/components/empty_state.vue';
+
+function createComponent(props) {
+  return shallowMount(EmptyState, {
+    propsData: {
+      ...props,
+      settingsPath: '/settingsPath',
+      clustersPath: '/clustersPath',
+      documentationPath: '/documentationPath',
+      emptyGettingStartedSvgPath: '/path/to/getting-started.svg',
+      emptyLoadingSvgPath: '/path/to/loading.svg',
+      emptyNoDataSvgPath: '/path/to/no-data.svg',
+      emptyUnableToConnectSvgPath: '/path/to/unable-to-connect.svg',
+    },
+  });
+}
+
+describe('EmptyState', () => {
+  it('shows gettingStarted state', () => {
+    const wrapper = createComponent({
+      selectedState: 'gettingStarted',
+    });
+
+    expect(wrapper.element).toMatchSnapshot();
+  });
+
+  it('shows loading state', () => {
+    const wrapper = createComponent({
+      selectedState: 'loading',
+    });
+
+    expect(wrapper.element).toMatchSnapshot();
+  });
+
+  it('shows unableToConnect state', () => {
+    const wrapper = createComponent({
+      selectedState: 'unableToConnect',
+    });
+
+    expect(wrapper.element).toMatchSnapshot();
+  });
+});
diff --git a/spec/frontend/notes/components/discussion_notes_replies_wrapper_spec.js b/spec/frontend/notes/components/discussion_notes_replies_wrapper_spec.js
new file mode 100644
index 00000000000..279ca017b44
--- /dev/null
+++ b/spec/frontend/notes/components/discussion_notes_replies_wrapper_spec.js
@@ -0,0 +1,51 @@
+import { mount } from '@vue/test-utils';
+import DiscussionNotesRepliesWrapper from '~/notes/components/discussion_notes_replies_wrapper.vue';
+
+const TEST_CHILDREN = '<li>Hello!</li><li>World!</li>';
+
+// We have to wrap our SUT with a TestComponent because multiple roots are possible
+// because it's a functional component.
+const TestComponent = {
+  components: { DiscussionNotesRepliesWrapper },
+  template: `<ul><discussion-notes-replies-wrapper v-bind="$attrs">${TEST_CHILDREN}</discussion-notes-replies-wrapper></ul>`,
+};
+
+describe('DiscussionNotesRepliesWrapper', () => {
+  let wrapper;
+
+  const createComponent = (props = {}) => {
+    wrapper = mount(TestComponent, {
+      propsData: props,
+      sync: false,
+    });
+  };
+
+  afterEach(() => {
+    wrapper.destroy();
+  });
+
+  describe('when normal discussion', () => {
+    beforeEach(() => {
+      createComponent();
+    });
+
+    it('renders children directly', () => {
+      expect(wrapper.html()).toEqual(`<ul>${TEST_CHILDREN}</ul>`);
+    });
+  });
+
+  describe('when diff discussion', () => {
+    beforeEach(() => {
+      createComponent({
+        isDiffDiscussion: true,
+      });
+    });
+
+    it('wraps children with notes', () => {
+      const notes = wrapper.find('li.discussion-collapsible ul.notes');
+
+      expect(notes.exists()).toBe(true);
+      expect(notes.html()).toEqual(`<ul class="notes">${TEST_CHILDREN}</ul>`);
+    });
+  });
+});
diff --git a/spec/graphql/gitlab_schema_spec.rb b/spec/graphql/gitlab_schema_spec.rb
index d36e428a8ee..93b86b9b812 100644
--- a/spec/graphql/gitlab_schema_spec.rb
+++ b/spec/graphql/gitlab_schema_spec.rb
@@ -21,6 +21,10 @@ describe GitlabSchema do
     expect(field_instrumenters).to include(instance_of(::Gitlab::Graphql::Present::Instrumentation))
   end
 
+  it 'enables using gitaly call checker' do
+    expect(field_instrumenters).to include(instance_of(::Gitlab::Graphql::CallsGitaly::Instrumentation))
+  end
+
   it 'has the base mutation' do
     expect(described_class.mutation).to eq(::Types::MutationType.to_graphql)
   end
diff --git a/spec/graphql/types/base_field_spec.rb b/spec/graphql/types/base_field_spec.rb
index 0d3c3e37daf..77ef8933717 100644
--- a/spec/graphql/types/base_field_spec.rb
+++ b/spec/graphql/types/base_field_spec.rb
@@ -22,6 +22,24 @@ describe Types::BaseField do
       expect(field.to_graphql.complexity).to eq 1
     end
 
+    describe '#base_complexity' do
+      context 'with no gitaly calls' do
+        it 'defaults to 1' do
+          field = described_class.new(name: 'test', type: GraphQL::STRING_TYPE, null: true)
+
+          expect(field.base_complexity).to eq 1
+        end
+      end
+
+      context 'with a gitaly call' do
+        it 'adds 1 to the default value' do
+          field = described_class.new(name: 'test', type: GraphQL::STRING_TYPE, null: true, calls_gitaly: true)
+
+          expect(field.base_complexity).to eq 2
+        end
+      end
+    end
+
     it 'has specified value' do
       field = described_class.new(name: 'test', type: GraphQL::STRING_TYPE, null: true, complexity: 12)
 
@@ -52,5 +70,46 @@ describe Types::BaseField do
         end
       end
     end
+
+    context 'calls_gitaly' do
+      context 'for fields with a resolver' do
+        it 'adds 1 if true' do
+          with_gitaly_field = described_class.new(name: 'test', type: GraphQL::STRING_TYPE, resolver_class: resolver, null: true, calls_gitaly: true)
+          without_gitaly_field = described_class.new(name: 'test', type: GraphQL::STRING_TYPE, resolver_class: resolver, null: true)
+          base_result = without_gitaly_field.to_graphql.complexity.call({}, {}, 2)
+
+          expect(with_gitaly_field.to_graphql.complexity.call({}, {}, 2)).to eq base_result + 1
+        end
+      end
+
+      context 'for fields without a resolver' do
+        it 'adds 1 if true' do
+          field = described_class.new(name: 'test', type: GraphQL::STRING_TYPE, null: true, calls_gitaly: true)
+
+          expect(field.to_graphql.complexity).to eq 2
+        end
+      end
+
+      it 'defaults to false' do
+        field = described_class.new(name: 'test', type: GraphQL::STRING_TYPE, null: true)
+
+        expect(field.base_complexity).to eq Types::BaseField::DEFAULT_COMPLEXITY
+      end
+
+      context 'with declared constant complexity value' do
+        it 'has complexity set to that constant' do
+          field = described_class.new(name: 'test', type: GraphQL::STRING_TYPE, null: true, complexity: 12)
+
+          expect(field.to_graphql.complexity).to eq 12
+        end
+
+        it 'does not raise an error even with Gitaly calls' do
+          allow(Gitlab::GitalyClient).to receive(:get_request_count).and_return([0, 1])
+          field = described_class.new(name: 'test', type: GraphQL::STRING_TYPE, null: true, complexity: 12)
+
+          expect(field.to_graphql.complexity).to eq 12
+        end
+      end
+    end
   end
 end
diff --git a/spec/helpers/preferences_helper_spec.rb b/spec/helpers/preferences_helper_spec.rb
index db0d45c3692..554c08add2d 100644
--- a/spec/helpers/preferences_helper_spec.rb
+++ b/spec/helpers/preferences_helper_spec.rb
@@ -28,7 +28,7 @@ describe PreferencesHelper do
         ["Your Projects' Activity", 'project_activity'],
         ["Starred Projects' Activity", 'starred_project_activity'],
         ["Your Groups", 'groups'],
-        ["Your Todos", 'todos'],
+        ["Your To-Do List", 'todos'],
         ["Assigned Issues", 'issues'],
         ["Assigned Merge Requests", 'merge_requests']
       ]
diff --git a/spec/helpers/storage_helper_spec.rb b/spec/helpers/storage_helper_spec.rb
index 62c00964524..4bd0fbb76ca 100644
--- a/spec/helpers/storage_helper_spec.rb
+++ b/spec/helpers/storage_helper_spec.rb
@@ -31,7 +31,7 @@ describe StorageHelper do
                                build_artifacts_size: 30.megabytes))
     end
 
-    let(:message) { '10 KB repositories, 10 Bytes wikis, 30 MB build artifacts, 20 GB LFS' }
+    let(:message) { 'Repository: 10 KB / Wikis: 10 Bytes / Build Artifacts: 30 MB / LFS: 20 GB' }
 
     it 'works on ProjectStatistics' do
       expect(helper.storage_counters_details(project.statistics)).to eq(message)
diff --git a/spec/javascripts/boards/mock_data.js b/spec/javascripts/boards/mock_data.js
index 9854cf49e97..ea22ae5c4e7 100644
--- a/spec/javascripts/boards/mock_data.js
+++ b/spec/javascripts/boards/mock_data.js
@@ -1,4 +1,5 @@
 import BoardService from '~/boards/services/board_service';
+import boardsStore from '~/boards/stores/boards_store';
 
 export const boardObj = {
   id: 1,
@@ -76,12 +77,14 @@ export const mockBoardService = (opts = {}) => {
   const bulkUpdatePath = opts.bulkUpdatePath || '';
   const boardId = opts.boardId || '1';
 
-  return new BoardService({
+  boardsStore.setEndpoints({
     boardsEndpoint,
     listsEndpoint,
     bulkUpdatePath,
     boardId,
   });
+
+  return new BoardService();
 };
 
 export const mockAssigneesList = [
diff --git a/spec/javascripts/collapsed_sidebar_todo_spec.js b/spec/javascripts/collapsed_sidebar_todo_spec.js
index bb90e53e525..f75d63c8f57 100644
--- a/spec/javascripts/collapsed_sidebar_todo_spec.js
+++ b/spec/javascripts/collapsed_sidebar_todo_spec.js
@@ -58,7 +58,7 @@ describe('Issuable right sidebar collapsed todo toggle', () => {
   it('sets default tooltip title', () => {
     expect(
       document.querySelector('.js-issuable-todo.sidebar-collapsed-icon').getAttribute('title'),
-    ).toBe('Add todo');
+    ).toBe('Add a To Do');
   });
 
   it('toggle todo state', done => {
@@ -85,7 +85,7 @@ describe('Issuable right sidebar collapsed todo toggle', () => {
     setTimeout(() => {
       expect(
         document.querySelector('.issuable-sidebar-header .js-issuable-todo').textContent.trim(),
-      ).toBe('Mark todo as done');
+      ).toBe('Mark as done');
 
       done();
     });
@@ -99,7 +99,7 @@ describe('Issuable right sidebar collapsed todo toggle', () => {
         document
           .querySelector('.js-issuable-todo.sidebar-collapsed-icon')
           .getAttribute('data-original-title'),
-      ).toBe('Mark todo as done');
+      ).toBe('Mark as done');
 
       done();
     });
@@ -124,13 +124,13 @@ describe('Issuable right sidebar collapsed todo toggle', () => {
 
         expect(
           document.querySelector('.issuable-sidebar-header .js-issuable-todo').textContent.trim(),
-        ).toBe('Add todo');
+        ).toBe('Add a To Do');
       })
       .then(done)
       .catch(done.fail);
   });
 
-  it('updates aria-label to mark todo as done', done => {
+  it('updates aria-label to Mark as done', done => {
     document.querySelector('.js-issuable-todo.sidebar-collapsed-icon').click();
 
     setTimeout(() => {
@@ -138,7 +138,7 @@ describe('Issuable right sidebar collapsed todo toggle', () => {
         document
           .querySelector('.js-issuable-todo.sidebar-collapsed-icon')
           .getAttribute('aria-label'),
-      ).toBe('Mark todo as done');
+      ).toBe('Mark as done');
 
       done();
     });
@@ -153,7 +153,7 @@ describe('Issuable right sidebar collapsed todo toggle', () => {
           document
             .querySelector('.js-issuable-todo.sidebar-collapsed-icon')
             .getAttribute('aria-label'),
-        ).toBe('Mark todo as done');
+        ).toBe('Mark as done');
 
         document.querySelector('.js-issuable-todo.sidebar-collapsed-icon').click();
       })
@@ -163,7 +163,7 @@ describe('Issuable right sidebar collapsed todo toggle', () => {
           document
             .querySelector('.js-issuable-todo.sidebar-collapsed-icon')
             .getAttribute('aria-label'),
-        ).toBe('Add todo');
+        ).toBe('Add a To Do');
       })
       .then(done)
       .catch(done.fail);
diff --git a/spec/javascripts/diffs/components/inline_diff_view_spec.js b/spec/javascripts/diffs/components/inline_diff_view_spec.js
index 0b3890b68d6..9b61dbe7975 100644
--- a/spec/javascripts/diffs/components/inline_diff_view_spec.js
+++ b/spec/javascripts/diffs/components/inline_diff_view_spec.js
@@ -10,6 +10,7 @@ describe('InlineDiffView', () => {
   let component;
   const getDiffFileMock = () => Object.assign({}, diffFileMockData);
   const getDiscussionsMockData = () => [Object.assign({}, discussionsMockData)];
+  const notesLength = getDiscussionsMockData()[0].notes.length;
 
   beforeEach(done => {
     const diffFile = getDiffFileMock();
@@ -40,7 +41,7 @@ describe('InlineDiffView', () => {
 
       Vue.nextTick(() => {
         expect(el.querySelectorAll('.notes_holder').length).toEqual(1);
-        expect(el.querySelectorAll('.notes_holder .note-discussion li').length).toEqual(6);
+        expect(el.querySelectorAll('.notes_holder .note').length).toEqual(notesLength + 1);
         expect(el.innerText.indexOf('comment 5')).toBeGreaterThan(-1);
         component.$store.dispatch('setInitialNotes', []);
 
diff --git a/spec/javascripts/ide/components/repo_editor_spec.js b/spec/javascripts/ide/components/repo_editor_spec.js
index f832096701f..7dc5cb24981 100644
--- a/spec/javascripts/ide/components/repo_editor_spec.js
+++ b/spec/javascripts/ide/components/repo_editor_spec.js
@@ -30,6 +30,7 @@ describe('RepoEditor', () => {
     Vue.set(vm.$store.state.entries, f.path, f);
 
     spyOn(vm, 'getFileData').and.returnValue(Promise.resolve());
+    spyOn(vm, 'getRawFileData').and.returnValue(Promise.resolve());
 
     vm.$mount();
 
@@ -407,6 +408,44 @@ describe('RepoEditor', () => {
     });
   });
 
+  describe('initEditor', () => {
+    beforeEach(() => {
+      spyOn(vm.editor, 'createInstance');
+      spyOnProperty(vm, 'shouldHideEditor').and.returnValue(true);
+    });
+
+    it('is being initialised for files without content even if shouldHideEditor is `true`', done => {
+      vm.file.content = '';
+      vm.file.raw = '';
+
+      vm.initEditor();
+      vm.$nextTick()
+        .then(() => {
+          expect(vm.getFileData).toHaveBeenCalled();
+          expect(vm.getRawFileData).toHaveBeenCalled();
+        })
+        .then(done)
+        .catch(done.fail);
+    });
+
+    it('does not initialize editor for files already with content', done => {
+      expect(vm.getFileData.calls.count()).toEqual(1);
+      expect(vm.getRawFileData.calls.count()).toEqual(1);
+
+      vm.file.content = 'foo';
+
+      vm.initEditor();
+      vm.$nextTick()
+        .then(() => {
+          expect(vm.getFileData.calls.count()).toEqual(1);
+          expect(vm.getRawFileData.calls.count()).toEqual(1);
+          expect(vm.editor.createInstance).not.toHaveBeenCalled();
+        })
+        .then(done)
+        .catch(done.fail);
+    });
+  });
+
   it('calls removePendingTab when old file is pending', done => {
     spyOnProperty(vm, 'shouldHideEditor').and.returnValue(true);
     spyOn(vm, 'removePendingTab');
@@ -416,6 +455,7 @@ describe('RepoEditor', () => {
     vm.$nextTick()
       .then(() => {
         vm.file = file('testing');
+        vm.file.content = 'foo'; // need to prevent full cycle of initEditor
 
         return vm.$nextTick();
       })
diff --git a/spec/javascripts/ide/stores/mutations/file_spec.js b/spec/javascripts/ide/stores/mutations/file_spec.js
index 18ee4330f69..7714f66c9a4 100644
--- a/spec/javascripts/ide/stores/mutations/file_spec.js
+++ b/spec/javascripts/ide/stores/mutations/file_spec.js
@@ -83,6 +83,26 @@ describe('IDE store file mutations', () => {
       expect(localFile.raw).toBeNull();
       expect(localFile.baseRaw).toBeNull();
     });
+
+    it('sets extra file data to all arrays concerned', () => {
+      localState.stagedFiles = [localFile];
+      localState.changedFiles = [localFile];
+      localState.openFiles = [localFile];
+
+      const rawPath = 'foo/bar/blah.md';
+
+      mutations.SET_FILE_DATA(localState, {
+        data: {
+          raw_path: rawPath,
+        },
+        file: localFile,
+      });
+
+      expect(localState.stagedFiles[0].rawPath).toEqual(rawPath);
+      expect(localState.changedFiles[0].rawPath).toEqual(rawPath);
+      expect(localState.openFiles[0].rawPath).toEqual(rawPath);
+      expect(localFile.rawPath).toEqual(rawPath);
+    });
   });
 
   describe('SET_FILE_RAW_DATA', () => {
diff --git a/spec/javascripts/issuable_spec.js b/spec/javascripts/issuable_spec.js
index 25543053eba..4d57bfb1b33 100644
--- a/spec/javascripts/issuable_spec.js
+++ b/spec/javascripts/issuable_spec.js
@@ -2,14 +2,14 @@ import $ from 'jquery';
 import MockAdaptor from 'axios-mock-adapter';
 import axios from '~/lib/utils/axios_utils';
 import IssuableIndex from '~/issuable_index';
+import issuableInitBulkUpdateSidebar from '~/issuable_init_bulk_update_sidebar';
 
 describe('Issuable', () => {
-  let Issuable;
   describe('initBulkUpdate', () => {
     it('should not set bulkUpdateSidebar', () => {
-      Issuable = new IssuableIndex('issue_');
+      new IssuableIndex('issue_'); // eslint-disable-line no-new
 
-      expect(Issuable.bulkUpdateSidebar).not.toBeDefined();
+      expect(issuableInitBulkUpdateSidebar.bulkUpdateSidebar).toBeNull();
     });
 
     it('should set bulkUpdateSidebar', () => {
@@ -17,9 +17,9 @@ describe('Issuable', () => {
       element.classList.add('issues-bulk-update');
       document.body.appendChild(element);
 
-      Issuable = new IssuableIndex('issue_');
+      new IssuableIndex('issue_'); // eslint-disable-line no-new
 
-      expect(Issuable.bulkUpdateSidebar).toBeDefined();
+      expect(issuableInitBulkUpdateSidebar.bulkUpdateSidebar).toBeDefined();
     });
   });
 
@@ -36,7 +36,7 @@ describe('Issuable', () => {
       input.setAttribute('id', 'issuable_email');
       document.body.appendChild(input);
 
-      Issuable = new IssuableIndex('issue_');
+      new IssuableIndex('issue_'); // eslint-disable-line no-new
 
       mock = new MockAdaptor(axios);
 
diff --git a/spec/javascripts/monitoring/dashboard_state_spec.js b/spec/javascripts/monitoring/dashboard_state_spec.js
deleted file mode 100644
index 6b2be83aa8c..00000000000
--- a/spec/javascripts/monitoring/dashboard_state_spec.js
+++ /dev/null
@@ -1,101 +0,0 @@
-import Vue from 'vue';
-import EmptyState from '~/monitoring/components/empty_state.vue';
-import { statePaths } from './mock_data';
-
-function createComponent(props) {
-  const Component = Vue.extend(EmptyState);
-
-  return new Component({
-    propsData: {
-      ...props,
-      settingsPath: statePaths.settingsPath,
-      clustersPath: statePaths.clustersPath,
-      documentationPath: statePaths.documentationPath,
-      emptyGettingStartedSvgPath: '/path/to/getting-started.svg',
-      emptyLoadingSvgPath: '/path/to/loading.svg',
-      emptyNoDataSvgPath: '/path/to/no-data.svg',
-      emptyUnableToConnectSvgPath: '/path/to/unable-to-connect.svg',
-    },
-  }).$mount();
-}
-
-function getTextFromNode(component, selector) {
-  return component.$el.querySelector(selector).firstChild.nodeValue.trim();
-}
-
-describe('EmptyState', () => {
-  describe('Computed props', () => {
-    it('currentState', () => {
-      const component = createComponent({
-        selectedState: 'gettingStarted',
-      });
-
-      expect(component.currentState).toBe(component.states.gettingStarted);
-    });
-
-    it('showButtonDescription returns a description with a link for the unableToConnect state', () => {
-      const component = createComponent({
-        selectedState: 'unableToConnect',
-      });
-
-      expect(component.showButtonDescription).toEqual(true);
-    });
-
-    it('showButtonDescription returns the description without a link for any other state', () => {
-      const component = createComponent({
-        selectedState: 'loading',
-      });
-
-      expect(component.showButtonDescription).toEqual(false);
-    });
-  });
-
-  it('should show the gettingStarted state', () => {
-    const component = createComponent({
-      selectedState: 'gettingStarted',
-    });
-
-    expect(component.$el.querySelector('svg')).toBeDefined();
-    expect(getTextFromNode(component, '.state-title')).toEqual(
-      component.states.gettingStarted.title,
-    );
-
-    expect(getTextFromNode(component, '.state-description')).toEqual(
-      component.states.gettingStarted.description,
-    );
-
-    expect(getTextFromNode(component, '.btn-success')).toEqual(
-      component.states.gettingStarted.buttonText,
-    );
-  });
-
-  it('should show the loading state', () => {
-    const component = createComponent({
-      selectedState: 'loading',
-    });
-
-    expect(component.$el.querySelector('svg')).toBeDefined();
-    expect(getTextFromNode(component, '.state-title')).toEqual(component.states.loading.title);
-    expect(getTextFromNode(component, '.state-description')).toEqual(
-      component.states.loading.description,
-    );
-
-    expect(getTextFromNode(component, '.btn-success')).toEqual(component.states.loading.buttonText);
-  });
-
-  it('should show the unableToConnect state', () => {
-    const component = createComponent({
-      selectedState: 'unableToConnect',
-    });
-
-    expect(component.$el.querySelector('svg')).toBeDefined();
-    expect(getTextFromNode(component, '.state-title')).toEqual(
-      component.states.unableToConnect.title,
-    );
-
-    expect(component.$el.querySelector('.state-description a')).toBeDefined();
-    expect(getTextFromNode(component, '.btn-success')).toEqual(
-      component.states.unableToConnect.buttonText,
-    );
-  });
-});
diff --git a/spec/javascripts/monitoring/store/utils_spec.js b/spec/javascripts/monitoring/store/utils_spec.js
new file mode 100644
index 00000000000..73dd370ffb3
--- /dev/null
+++ b/spec/javascripts/monitoring/store/utils_spec.js
@@ -0,0 +1,37 @@
+import { groupQueriesByChartInfo } from '~/monitoring/stores/utils';
+
+describe('groupQueriesByChartInfo', () => {
+  let input;
+  let output;
+
+  it('groups metrics with the same chart title and y_axis label', () => {
+    input = [
+      { title: 'title', y_label: 'MB', queries: [{}] },
+      { title: 'title', y_label: 'MB', queries: [{}] },
+      { title: 'new title', y_label: 'MB', queries: [{}] },
+    ];
+
+    output = [
+      { title: 'title', y_label: 'MB', queries: [{ metricId: null }, { metricId: null }] },
+      { title: 'new title', y_label: 'MB', queries: [{ metricId: null }] },
+    ];
+
+    expect(groupQueriesByChartInfo(input)).toEqual(output);
+  });
+
+  // Functionality associated with the /additional_metrics endpoint
+  it("associates a chart's stringified metric_id with the metric", () => {
+    input = [{ id: 3, title: 'new title', y_label: 'MB', queries: [{}] }];
+    output = [{ id: 3, title: 'new title', y_label: 'MB', queries: [{ metricId: '3' }] }];
+
+    expect(groupQueriesByChartInfo(input)).toEqual(output);
+  });
+
+  // Functionality associated with the /metrics_dashboard endpoint
+  it('aliases a stringified metrics_id on the metric to the metricId key', () => {
+    input = [{ title: 'new title', y_label: 'MB', queries: [{ metric_id: 3 }] }];
+    output = [{ title: 'new title', y_label: 'MB', queries: [{ metricId: '3', metric_id: 3 }] }];
+
+    expect(groupQueriesByChartInfo(input)).toEqual(output);
+  });
+});
diff --git a/spec/javascripts/notes/components/comment_form_spec.js b/spec/javascripts/notes/components/comment_form_spec.js
index 362963ddaf4..88c86746992 100644
--- a/spec/javascripts/notes/components/comment_form_spec.js
+++ b/spec/javascripts/notes/components/comment_form_spec.js
@@ -251,6 +251,21 @@ describe('issue_comment_form component', () => {
           });
         });
       });
+
+      describe('when toggling state', () => {
+        it('should update MR count', done => {
+          spyOn(vm, 'closeIssue').and.returnValue(Promise.resolve());
+
+          const updateMrCountSpy = spyOnDependency(CommentForm, 'refreshUserMergeRequestCounts');
+          vm.toggleIssueState();
+
+          Vue.nextTick(() => {
+            expect(updateMrCountSpy).toHaveBeenCalled();
+
+            done();
+          });
+        });
+      });
     });
 
     describe('issue is confidential', () => {
diff --git a/spec/javascripts/notes/stores/actions_spec.js b/spec/javascripts/notes/stores/actions_spec.js
index 65f72a135aa..c97ff5236ec 100644
--- a/spec/javascripts/notes/stores/actions_spec.js
+++ b/spec/javascripts/notes/stores/actions_spec.js
@@ -1,6 +1,7 @@
 import Vue from 'vue';
 import $ from 'jquery';
 import _ from 'underscore';
+import Api from '~/api';
 import { TEST_HOST } from 'spec/test_constants';
 import { headersInterceptor } from 'spec/helpers/vue_resource_helper';
 import actionsModule, * as actions from '~/notes/stores/actions';
@@ -8,7 +9,6 @@ import * as mutationTypes from '~/notes/stores/mutation_types';
 import * as notesConstants from '~/notes/constants';
 import createStore from '~/notes/stores';
 import mrWidgetEventHub from '~/vue_merge_request_widget/event_hub';
-import service from '~/notes/services/notes_service';
 import testAction from '../../helpers/vuex_action_helper';
 import { resetStore } from '../helpers';
 import {
@@ -846,9 +846,9 @@ describe('Actions Notes Store', () => {
     let flashContainer;
 
     beforeEach(() => {
-      spyOn(service, 'applySuggestion');
+      spyOn(Api, 'applySuggestion');
       dispatch.and.returnValue(Promise.resolve());
-      service.applySuggestion.and.returnValue(Promise.resolve());
+      Api.applySuggestion.and.returnValue(Promise.resolve());
       flashContainer = {};
     });
 
@@ -877,7 +877,7 @@ describe('Actions Notes Store', () => {
     it('when service fails, flashes error message', done => {
       const response = { response: { data: { message: TEST_ERROR_MESSAGE } } };
 
-      service.applySuggestion.and.returnValue(Promise.reject(response));
+      Api.applySuggestion.and.returnValue(Promise.reject(response));
 
       testSubmitSuggestion(done, () => {
         expect(commit).not.toHaveBeenCalled();
diff --git a/spec/javascripts/sidebar/todo_spec.js b/spec/javascripts/sidebar/todo_spec.js
index f46ea5a0499..e7abd19c865 100644
--- a/spec/javascripts/sidebar/todo_spec.js
+++ b/spec/javascripts/sidebar/todo_spec.js
@@ -53,14 +53,14 @@ describe('SidebarTodo', () => {
 
     describe('buttonLabel', () => {
       it('returns todo button text for marking todo as done when `isTodo` prop is `true`', () => {
-        expect(vm.buttonLabel).toBe('Mark todo as done');
+        expect(vm.buttonLabel).toBe('Mark as done');
       });
 
       it('returns todo button text for add todo when `isTodo` prop is `false`', done => {
         vm.isTodo = false;
         Vue.nextTick()
           .then(() => {
-            expect(vm.buttonLabel).toBe('Add todo');
+            expect(vm.buttonLabel).toBe('Add a To Do');
           })
           .then(done)
           .catch(done.fail);
@@ -131,14 +131,14 @@ describe('SidebarTodo', () => {
     });
 
     it('check button label computed property', () => {
-      expect(vm.buttonLabel).toEqual('Mark todo as done');
+      expect(vm.buttonLabel).toEqual('Mark as done');
     });
 
     it('renders button label element when `collapsed` prop is `false`', () => {
       const buttonLabelEl = vm.$el.querySelector('span.issuable-todo-inner');
 
       expect(buttonLabelEl).not.toBeNull();
-      expect(buttonLabelEl.innerText.trim()).toBe('Mark todo as done');
+      expect(buttonLabelEl.innerText.trim()).toBe('Mark as done');
     });
 
     it('renders button icon when `collapsed` prop is `true`', done => {
diff --git a/spec/javascripts/test_bundle.js b/spec/javascripts/test_bundle.js
index 2cc476ed52a..50741e249ca 100644
--- a/spec/javascripts/test_bundle.js
+++ b/spec/javascripts/test_bundle.js
@@ -8,7 +8,6 @@ import '~/commons';
 import Vue from 'vue';
 import VueResource from 'vue-resource';
 import Translate from '~/vue_shared/translate';
-import CheckEE from '~/vue_shared/mixins/is_ee';
 import jasmineDiff from 'jasmine-diff';
 import { config as testUtilsConfig } from '@vue/test-utils';
 
@@ -48,7 +47,6 @@ Vue.config.errorHandler = function(err) {
 
 Vue.use(VueResource);
 Vue.use(Translate);
-Vue.use(CheckEE);
 
 // enable test fixtures
 jasmine.getFixtures().fixturesPath = FIXTURES_PATH;
diff --git a/spec/javascripts/vue_mr_widget/components/states/mr_widget_ready_to_merge_spec.js b/spec/javascripts/vue_mr_widget/components/states/mr_widget_ready_to_merge_spec.js
index bb76616be56..ba3ba01944d 100644
--- a/spec/javascripts/vue_mr_widget/components/states/mr_widget_ready_to_merge_spec.js
+++ b/spec/javascripts/vue_mr_widget/components/states/mr_widget_ready_to_merge_spec.js
@@ -58,9 +58,11 @@ const createComponent = (customConfig = {}) => {
 
 describe('ReadyToMerge', () => {
   let vm;
+  let updateMrCountSpy;
 
   beforeEach(() => {
     vm = createComponent();
+    updateMrCountSpy = spyOnDependency(ReadyToMerge, 'refreshUserMergeRequestCounts');
   });
 
   afterEach(() => {
@@ -461,6 +463,7 @@ describe('ReadyToMerge', () => {
           expect(eventHub.$emit).toHaveBeenCalledWith('MRWidgetUpdateRequested');
           expect(eventHub.$emit).toHaveBeenCalledWith('FetchActionsContent');
           expect(vm.initiateRemoveSourceBranchPolling).toHaveBeenCalled();
+          expect(updateMrCountSpy).toHaveBeenCalled();
           expect(cpc).toBeFalsy();
           expect(spc).toBeTruthy();
 
diff --git a/spec/lib/feature_spec.rb b/spec/lib/feature_spec.rb
index 403e0785d1b..127463a57e8 100644
--- a/spec/lib/feature_spec.rb
+++ b/spec/lib/feature_spec.rb
@@ -144,6 +144,68 @@ describe Feature do
       expect(described_class.enabled?(:enabled_feature_flag)).to be_truthy
     end
 
+    it { expect(described_class.l1_cache_backend).to eq(Gitlab::ThreadMemoryCache.cache_backend) }
+    it { expect(described_class.l2_cache_backend).to eq(Rails.cache) }
+
+    it 'caches the status in L1 and L2 caches',
+       :request_store, :use_clean_rails_memory_store_caching do
+      described_class.enable(:enabled_feature_flag)
+      flipper_key = "flipper/v1/feature/enabled_feature_flag"
+
+      expect(described_class.l2_cache_backend)
+        .to receive(:fetch)
+        .once
+        .with(flipper_key, expires_in: 1.hour)
+        .and_call_original
+
+      expect(described_class.l1_cache_backend)
+        .to receive(:fetch)
+        .once
+        .with(flipper_key, expires_in: 1.minute)
+        .and_call_original
+
+      2.times do
+        expect(described_class.enabled?(:enabled_feature_flag)).to be_truthy
+      end
+    end
+
+    context 'cached feature flag', :request_store do
+      let(:flag) { :some_feature_flag }
+
+      before do
+        described_class.flipper.memoize = false
+        described_class.enabled?(flag)
+      end
+
+      it 'caches the status in L1 cache for the first minute' do
+        expect do
+          expect(described_class.l1_cache_backend).to receive(:fetch).once.and_call_original
+          expect(described_class.l2_cache_backend).not_to receive(:fetch)
+          expect(described_class.enabled?(flag)).to be_truthy
+        end.not_to exceed_query_limit(0)
+      end
+
+      it 'caches the status in L2 cache after 2 minutes' do
+        Timecop.travel 2.minutes do
+          expect do
+            expect(described_class.l1_cache_backend).to receive(:fetch).once.and_call_original
+            expect(described_class.l2_cache_backend).to receive(:fetch).once.and_call_original
+            expect(described_class.enabled?(flag)).to be_truthy
+          end.not_to exceed_query_limit(0)
+        end
+      end
+
+      it 'fetches the status after an hour' do
+        Timecop.travel 61.minutes do
+          expect do
+            expect(described_class.l1_cache_backend).to receive(:fetch).once.and_call_original
+            expect(described_class.l2_cache_backend).to receive(:fetch).once.and_call_original
+            expect(described_class.enabled?(flag)).to be_truthy
+          end.not_to exceed_query_limit(1)
+        end
+      end
+    end
+
     context 'with an individual actor' do
       CustomActor = Struct.new(:flipper_id)
 
diff --git a/spec/lib/gitlab/cache/ci/project_pipeline_status_spec.rb b/spec/lib/gitlab/cache/ci/project_pipeline_status_spec.rb
index 483c5ea9cff..972dd7e0d2b 100644
--- a/spec/lib/gitlab/cache/ci/project_pipeline_status_spec.rb
+++ b/spec/lib/gitlab/cache/ci/project_pipeline_status_spec.rb
@@ -26,6 +26,7 @@ describe Gitlab::Cache::Ci::ProjectPipelineStatus, :clean_gitlab_redis_cache do
       end
 
       it 'loads 10 projects without hitting Gitaly call limit', :request_store do
+        allow(Gitlab::GitalyClient).to receive(:can_access_disk?).and_return(false)
         projects = Gitlab::GitalyClient.allow_n_plus_1_calls do
           (1..10).map { create(:project, :repository) }
         end
diff --git a/spec/lib/gitlab/ci/reports/test_reports_comparer_spec.rb b/spec/lib/gitlab/ci/reports/test_reports_comparer_spec.rb
index 71c61e0345f..36582204cc1 100644
--- a/spec/lib/gitlab/ci/reports/test_reports_comparer_spec.rb
+++ b/spec/lib/gitlab/ci/reports/test_reports_comparer_spec.rb
@@ -74,17 +74,11 @@ describe Gitlab::Ci::Reports::TestReportsComparer do
     subject { comparer.resolved_count }
 
     context 'when there is a resolved test case in head suites' do
-      let(:create_test_case_java_resolved) do
-        create_test_case_java_failed.tap do |test_case|
-          test_case.instance_variable_set("@status", Gitlab::Ci::Reports::TestCase::STATUS_SUCCESS)
-        end
-      end
-
       before do
         base_reports.get_suite('rspec').add_test_case(create_test_case_rspec_success)
         base_reports.get_suite('junit').add_test_case(create_test_case_java_failed)
         head_reports.get_suite('rspec').add_test_case(create_test_case_rspec_success)
-        head_reports.get_suite('junit').add_test_case(create_test_case_java_resolved)
+        head_reports.get_suite('junit').add_test_case(create_test_case_java_success)
       end
 
       it 'returns the correct count' do
diff --git a/spec/lib/gitlab/ci/reports/test_suite_comparer_spec.rb b/spec/lib/gitlab/ci/reports/test_suite_comparer_spec.rb
index 6ab16e5518d..579b3e6fd24 100644
--- a/spec/lib/gitlab/ci/reports/test_suite_comparer_spec.rb
+++ b/spec/lib/gitlab/ci/reports/test_suite_comparer_spec.rb
@@ -10,12 +10,6 @@ describe Gitlab::Ci::Reports::TestSuiteComparer do
   let(:test_case_success) { create_test_case_rspec_success }
   let(:test_case_failed) { create_test_case_rspec_failed }
 
-  let(:test_case_resolved) do
-    create_test_case_rspec_failed.tap do |test_case|
-      test_case.instance_variable_set("@status", Gitlab::Ci::Reports::TestCase::STATUS_SUCCESS)
-    end
-  end
-
   describe '#new_failures' do
     subject { comparer.new_failures }
 
@@ -44,7 +38,7 @@ describe Gitlab::Ci::Reports::TestSuiteComparer do
     context 'when head sutie has a success test case which failed in base' do
       before do
         base_suite.add_test_case(test_case_failed)
-        head_suite.add_test_case(test_case_resolved)
+        head_suite.add_test_case(test_case_success)
       end
 
       it 'does not return the failed test case' do
@@ -81,7 +75,7 @@ describe Gitlab::Ci::Reports::TestSuiteComparer do
     context 'when head sutie has a success test case which failed in base' do
       before do
         base_suite.add_test_case(test_case_failed)
-        head_suite.add_test_case(test_case_resolved)
+        head_suite.add_test_case(test_case_success)
       end
 
       it 'does not return the failed test case' do
@@ -126,11 +120,11 @@ describe Gitlab::Ci::Reports::TestSuiteComparer do
     context 'when head sutie has a success test case which failed in base' do
       before do
         base_suite.add_test_case(test_case_failed)
-        head_suite.add_test_case(test_case_resolved)
+        head_suite.add_test_case(test_case_success)
       end
 
       it 'does not return the resolved test case' do
-        is_expected.to eq([test_case_resolved])
+        is_expected.to eq([test_case_success])
       end
 
       it 'returns the correct resolved count' do
@@ -156,13 +150,8 @@ describe Gitlab::Ci::Reports::TestSuiteComparer do
 
     context 'when there are a new failure and an existing failure' do
       let(:test_case_1_success) { create_test_case_rspec_success }
-      let(:test_case_2_failed) { create_test_case_rspec_failed }
-
-      let(:test_case_1_failed) do
-        create_test_case_rspec_success.tap do |test_case|
-          test_case.instance_variable_set("@status", Gitlab::Ci::Reports::TestCase::STATUS_FAILED)
-        end
-      end
+      let(:test_case_1_failed) { create_test_case_rspec_failed }
+      let(:test_case_2_failed) { create_test_case_rspec_failed('case2') }
 
       before do
         base_suite.add_test_case(test_case_1_success)
diff --git a/spec/lib/gitlab/cycle_analytics/test_stage_spec.rb b/spec/lib/gitlab/cycle_analytics/test_stage_spec.rb
index eacde22cd56..8633a63849f 100644
--- a/spec/lib/gitlab/cycle_analytics/test_stage_spec.rb
+++ b/spec/lib/gitlab/cycle_analytics/test_stage_spec.rb
@@ -3,6 +3,40 @@ require 'lib/gitlab/cycle_analytics/shared_stage_spec'
 
 describe Gitlab::CycleAnalytics::TestStage do
   let(:stage_name) { :test }
+  let(:project) { create(:project) }
+  let(:stage) { described_class.new(project: project, options: { from: 2.days.ago, current_user: project.creator }) }
 
   it_behaves_like 'base stage'
+
+  describe '#median' do
+    before do
+      issue_1 = create(:issue, project: project, created_at: 90.minutes.ago)
+      issue_2 = create(:issue, project: project, created_at: 60.minutes.ago)
+      issue_3 = create(:issue, project: project, created_at: 60.minutes.ago)
+      mr_1 = create(:merge_request, :closed, source_project: project, created_at: 60.minutes.ago)
+      mr_2 = create(:merge_request, :closed, source_project: project, created_at: 40.minutes.ago, source_branch: 'A')
+      mr_3 = create(:merge_request, source_project: project, created_at: 10.minutes.ago, source_branch: 'B')
+      mr_4 = create(:merge_request, source_project: project, created_at: 10.minutes.ago, source_branch: 'C')
+      mr_5 = create(:merge_request, source_project: project, created_at: 10.minutes.ago, source_branch: 'D')
+      mr_1.metrics.update!(latest_build_started_at: 32.minutes.ago, latest_build_finished_at: 2.minutes.ago)
+      mr_2.metrics.update!(latest_build_started_at: 62.minutes.ago, latest_build_finished_at: 32.minutes.ago)
+      mr_3.metrics.update!(latest_build_started_at: nil, latest_build_finished_at: nil)
+      mr_4.metrics.update!(latest_build_started_at: nil, latest_build_finished_at: nil)
+      mr_5.metrics.update!(latest_build_started_at: nil, latest_build_finished_at: nil)
+
+      create(:merge_requests_closing_issues, merge_request: mr_1, issue: issue_1)
+      create(:merge_requests_closing_issues, merge_request: mr_2, issue: issue_2)
+      create(:merge_requests_closing_issues, merge_request: mr_3, issue: issue_3)
+      create(:merge_requests_closing_issues, merge_request: mr_4, issue: issue_3)
+      create(:merge_requests_closing_issues, merge_request: mr_5, issue: issue_3)
+    end
+
+    around do |example|
+      Timecop.freeze { example.run }
+    end
+
+    it 'counts median from issues with metrics' do
+      expect(stage.median).to eq(ISSUES_MEDIAN)
+    end
+  end
 end
diff --git a/spec/lib/gitlab/danger/helper_spec.rb b/spec/lib/gitlab/danger/helper_spec.rb
index c8e65a3e59d..92d90ac2fef 100644
--- a/spec/lib/gitlab/danger/helper_spec.rb
+++ b/spec/lib/gitlab/danger/helper_spec.rb
@@ -87,13 +87,13 @@ describe Gitlab::Danger::Helper do
 
   describe '#changes_by_category' do
     it 'categorizes changed files' do
-      expect(fake_git).to receive(:added_files) { %w[foo foo.md foo.rb foo.js db/foo qa/foo ee/changelogs/foo.yml] }
+      expect(fake_git).to receive(:added_files) { %w[foo foo.md foo.rb foo.js db/foo lib/gitlab/database/foo.rb qa/foo ee/changelogs/foo.yml] }
       allow(fake_git).to receive(:modified_files) { [] }
       allow(fake_git).to receive(:renamed_files) { [] }
 
       expect(helper.changes_by_category).to eq(
         backend: %w[foo.rb],
-        database: %w[db/foo],
+        database: %w[db/foo lib/gitlab/database/foo.rb],
         frontend: %w[foo.js],
         none: %w[ee/changelogs/foo.yml foo.md],
         qa: %w[qa/foo],
@@ -159,9 +159,22 @@ describe Gitlab::Danger::Helper do
 
       'ee/FOO_VERSION' | :unknown
 
-      'db/foo' | :database
-      'qa/foo' | :qa
+      'db/foo'                                                    | :database
+      'ee/db/foo'                                                 | :database
+      'app/models/project_authorization.rb'                       | :database
+      'app/services/users/refresh_authorized_projects_service.rb' | :database
+      'lib/gitlab/background_migration.rb'                        | :database
+      'lib/gitlab/background_migration/foo'                       | :database
+      'ee/lib/gitlab/background_migration/foo'                    | :database
+      'lib/gitlab/database.rb'                                    | :database
+      'lib/gitlab/database/foo'                                   | :database
+      'ee/lib/gitlab/database/foo'                                | :database
+      'lib/gitlab/github_import.rb'                               | :database
+      'lib/gitlab/github_import/foo'                              | :database
+      'lib/gitlab/sql/foo'                                        | :database
+      'rubocop/cop/migration/foo'                                 | :database
 
+      'qa/foo' | :qa
       'ee/qa/foo' | :qa
 
       'changelogs/foo'    | :none
diff --git a/spec/lib/gitlab/diff/position_spec.rb b/spec/lib/gitlab/diff/position_spec.rb
index aea02d21048..b755cd1aff0 100644
--- a/spec/lib/gitlab/diff/position_spec.rb
+++ b/spec/lib/gitlab/diff/position_spec.rb
@@ -610,4 +610,17 @@ describe Gitlab::Diff::Position do
       it_behaves_like "diff position json"
     end
   end
+
+  describe "#file_hash" do
+    subject do
+      described_class.new(
+        old_path: "image.jpg",
+        new_path: "image.jpg"
+      )
+    end
+
+    it "returns SHA1 representation of the file_path" do
+      expect(subject.file_hash).to eq(Digest::SHA1.hexdigest(subject.file_path))
+    end
+  end
 end
diff --git a/spec/lib/gitlab/diff/position_tracer/image_strategy_spec.rb b/spec/lib/gitlab/diff/position_tracer/image_strategy_spec.rb
new file mode 100644
index 00000000000..900816af53a
--- /dev/null
+++ b/spec/lib/gitlab/diff/position_tracer/image_strategy_spec.rb
@@ -0,0 +1,238 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe Gitlab::Diff::PositionTracer::ImageStrategy do
+  include PositionTracerHelpers
+
+  let(:project) { create(:project, :repository) }
+  let(:current_user) { project.owner }
+  let(:file_name) { 'test-file' }
+  let(:new_file_name) { "#{file_name}-new" }
+  let(:second_file_name) { "#{file_name}-2" }
+  let(:branch_name) { 'position-tracer-test' }
+  let(:old_position) { position(old_path: file_name, new_path: file_name, position_type: 'image') }
+
+  let(:tracer) do
+    Gitlab::Diff::PositionTracer.new(
+      project: project,
+      old_diff_refs: old_diff_refs,
+      new_diff_refs: new_diff_refs
+    )
+  end
+
+  let(:strategy) { described_class.new(tracer) }
+
+  subject { strategy.trace(old_position) }
+
+  let(:initial_commit) do
+    project.commit(create_branch(branch_name, 'master')[:branch].name)
+  end
+
+  describe '#trace' do
+    describe 'diff scenarios' do
+      let(:create_file_commit) do
+        initial_commit
+
+        create_file(
+          branch_name,
+          file_name,
+          Base64.encode64('content')
+        )
+      end
+
+      let(:update_file_commit) do
+        create_file_commit
+
+        update_file(
+          branch_name,
+          file_name,
+          Base64.encode64('updatedcontent')
+        )
+      end
+
+      let(:update_file_again_commit) do
+        update_file_commit
+
+        update_file(
+          branch_name,
+          file_name,
+          Base64.encode64('updatedcontentagain')
+        )
+      end
+
+      let(:delete_file_commit) do
+        create_file_commit
+        delete_file(branch_name, file_name)
+      end
+
+      let(:rename_file_commit) do
+        delete_file_commit
+
+        create_file(
+          branch_name,
+          new_file_name,
+          Base64.encode64('renamedcontent')
+        )
+      end
+
+      let(:create_second_file_commit) do
+        create_file_commit
+
+        create_file(
+          branch_name,
+          second_file_name,
+          Base64.encode64('morecontent')
+        )
+      end
+
+      let(:create_another_file_commit) do
+        create_file(
+          branch_name,
+          second_file_name,
+          Base64.encode64('morecontent')
+        )
+      end
+
+      let(:update_another_file_commit) do
+        update_file(
+          branch_name,
+          second_file_name,
+          Base64.encode64('updatedmorecontent')
+        )
+      end
+
+      context 'when the file was created in the old diff' do
+        context 'when the file is unchanged between the old and the new diff' do
+          let(:old_diff_refs) { diff_refs(initial_commit, create_file_commit) }
+          let(:new_diff_refs) { diff_refs(initial_commit, create_second_file_commit) }
+
+          it 'returns the new position' do
+            expect_new_position(
+              old_path: file_name,
+              new_path: file_name
+            )
+          end
+        end
+
+        context 'when the file was updated between the old and the new diff' do
+          let(:old_diff_refs) { diff_refs(initial_commit, create_file_commit) }
+          let(:new_diff_refs) { diff_refs(initial_commit, update_file_commit) }
+          let(:change_diff_refs) { diff_refs(create_file_commit, update_file_commit) }
+
+          it 'returns the position of the change' do
+            expect_change_position(
+              old_path: file_name,
+              new_path: file_name
+            )
+          end
+        end
+
+        context 'when the file was renamed in between the old and the new diff' do
+          let(:old_diff_refs) { diff_refs(initial_commit, create_file_commit) }
+          let(:new_diff_refs) { diff_refs(initial_commit, rename_file_commit) }
+          let(:change_diff_refs) { diff_refs(create_file_commit, rename_file_commit) }
+
+          it 'returns the position of the change' do
+            expect_change_position(
+              old_path: file_name,
+              new_path: file_name
+            )
+          end
+        end
+
+        context 'when the file was removed in between the old and the new diff' do
+          let(:old_diff_refs) { diff_refs(initial_commit, create_file_commit) }
+          let(:new_diff_refs) { diff_refs(initial_commit, delete_file_commit) }
+          let(:change_diff_refs) { diff_refs(create_file_commit, delete_file_commit) }
+
+          it 'returns the position of the change' do
+            expect_change_position(
+              old_path: file_name,
+              new_path: file_name
+            )
+          end
+        end
+
+        context 'when the file is unchanged in the new diff' do
+          let(:old_diff_refs) { diff_refs(initial_commit, create_file_commit) }
+          let(:new_diff_refs) { diff_refs(create_another_file_commit, update_another_file_commit) }
+          let(:change_diff_refs) { diff_refs(initial_commit, create_another_file_commit) }
+
+          it 'returns the position of the change' do
+            expect_change_position(
+              old_path: file_name,
+              new_path: file_name
+            )
+          end
+        end
+      end
+
+      context 'when the file was changed in the old diff' do
+        context 'when the file is unchanged in between the old and the new diff' do
+          let(:old_diff_refs) { diff_refs(create_file_commit, update_file_commit) }
+          let(:new_diff_refs) { diff_refs(create_file_commit, create_second_file_commit) }
+
+          it 'returns the new position' do
+            expect_new_position(
+              old_path: file_name,
+              new_path: file_name
+            )
+          end
+        end
+
+        context 'when the file was updated in between the old and the new diff' do
+          let(:old_diff_refs) { diff_refs(create_file_commit, update_file_commit) }
+          let(:new_diff_refs) { diff_refs(create_file_commit, update_file_again_commit) }
+          let(:change_diff_refs) { diff_refs(update_file_commit, update_file_again_commit) }
+
+          it 'returns the position of the change' do
+            expect_change_position(
+              old_path: file_name,
+              new_path: file_name
+            )
+          end
+        end
+
+        context 'when the file was renamed in between the old and the new diff' do
+          let(:old_diff_refs) { diff_refs(create_file_commit, update_file_commit) }
+          let(:new_diff_refs) { diff_refs(create_file_commit, rename_file_commit) }
+          let(:change_diff_refs) { diff_refs(update_file_commit, rename_file_commit) }
+
+          it 'returns the position of the change' do
+            expect_change_position(
+              old_path: file_name,
+              new_path: file_name
+            )
+          end
+        end
+
+        context 'when the file was removed in between the old and the new diff' do
+          let(:old_diff_refs) { diff_refs(create_file_commit, update_file_commit) }
+          let(:new_diff_refs) { diff_refs(create_file_commit, delete_file_commit) }
+          let(:change_diff_refs) { diff_refs(update_file_commit, delete_file_commit) }
+
+          it 'returns the position of the change' do
+            expect_change_position(
+              old_path: file_name,
+              new_path: file_name
+            )
+          end
+        end
+
+        context 'when the file is unchanged in the new diff' do
+          let(:old_diff_refs) { diff_refs(create_file_commit, update_file_commit) }
+          let(:new_diff_refs) { diff_refs(create_another_file_commit, update_another_file_commit) }
+          let(:change_diff_refs) { diff_refs(create_file_commit, create_another_file_commit) }
+
+          it 'returns the position of the change' do
+            expect_change_position(
+              old_path: file_name,
+              new_path: file_name
+            )
+          end
+        end
+      end
+    end
+  end
+end
diff --git a/spec/lib/gitlab/diff/position_tracer/line_strategy_spec.rb b/spec/lib/gitlab/diff/position_tracer/line_strategy_spec.rb
new file mode 100644
index 00000000000..7f4902c5b86
--- /dev/null
+++ b/spec/lib/gitlab/diff/position_tracer/line_strategy_spec.rb
@@ -0,0 +1,1805 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe Gitlab::Diff::PositionTracer::LineStrategy do
+  # Douwe's diary                                    New York City, 2016-06-28
+  # --------------------------------------------------------------------------
+  #
+  # Dear diary,
+  #
+  # Ideally, we would have a test for every single diff scenario that can
+  # occur and that the PositionTracer should correctly trace a position
+  # through, across the following variables:
+  #
+  # - Old diff file type: created, changed, renamed, deleted, unchanged (5)
+  # - Old diff line type: added, removed, unchanged (3)
+  # - New diff file type: created, changed, renamed, deleted, unchanged (5)
+  # - New diff line type: added, removed, unchanged (3)
+  # - Old-to-new diff line change: kept, moved, undone (3)
+  #
+  # This adds up to 5 * 3 * 5 * 3 * 3 = 675 different potential scenarios,
+  # and 675 different tests to cover them all. In reality, it would be fewer,
+  # since one cannot have a removed line in a created file diff, for example,
+  # but for the sake of this diary entry, let's be pessimistic.
+  #
+  # Writing these tests is a manual and time consuming process, as every test
+  # requires the manual construction or finding of a combination of diffs that
+  # create the exact diff scenario we are looking for, and can take between
+  # 1 and 10 minutes, depending on the farfetchedness of the scenario and
+  # complexity of creating it.
+  #
+  # This means that writing tests to cover all of these scenarios would end up
+  # taking between 11 and 112 hours in total, which I do not believe is the
+  # best use of my time.
+  #
+  # A better course of action would be to think of scenarios that are likely
+  # to occur, but also potentially tricky to trace correctly, and only cover
+  # those, with a few more obvious scenarios thrown in to cover our bases.
+  #
+  # Unfortunately, I only came to the above realization once I was about
+  # 1/5th of the way through the process of writing ALL THE SPECS, having
+  # already wasted about 3 hours trying to be thorough.
+  #
+  # I did find 2 bugs while writing those though, so that's good.
+  #
+  # In any case, all of this means that the tests below will be extremely
+  # (excessively, unjustifiably) thorough for scenarios where "the file was
+  # created in the old diff" and then drop off to comparatively lackluster
+  # testing of other scenarios.
+  #
+  # I did still try to cover most of the obvious and potentially tricky
+  # scenarios, though.
+
+  include RepoHelpers
+  include PositionTracerHelpers
+
+  let(:project) { create(:project, :repository) }
+  let(:current_user) { project.owner }
+  let(:repository) { project.repository }
+  let(:file_name) { "test-file" }
+  let(:new_file_name) { "#{file_name}-new" }
+  let(:second_file_name) { "#{file_name}-2" }
+  let(:branch_name) { "position-tracer-test" }
+
+  let(:old_diff_refs) { raise NotImplementedError }
+  let(:new_diff_refs) { raise NotImplementedError }
+  let(:change_diff_refs) { raise NotImplementedError }
+  let(:old_position) { raise NotImplementedError }
+
+  let(:tracer) do
+    Gitlab::Diff::PositionTracer.new(
+      project: project,
+      old_diff_refs: old_diff_refs,
+      new_diff_refs: new_diff_refs
+    )
+  end
+
+  let(:strategy) { described_class.new(tracer) }
+
+  subject { strategy.trace(old_position) }
+
+  let(:initial_commit) do
+    project.commit(create_branch(branch_name, 'master')[:branch].name)
+  end
+
+  describe "#trace" do
+    describe "diff scenarios" do
+      let(:create_file_commit) do
+        initial_commit
+
+        create_file(
+          branch_name,
+          file_name,
+          <<-CONTENT.strip_heredoc
+            A
+            B
+            C
+          CONTENT
+        )
+      end
+
+      let(:create_second_file_commit) do
+        create_file_commit
+
+        create_file(
+          branch_name,
+          second_file_name,
+          <<-CONTENT.strip_heredoc
+            D
+            E
+          CONTENT
+        )
+      end
+
+      let(:update_line_commit) do
+        create_second_file_commit
+
+        update_file(
+          branch_name,
+          file_name,
+          <<-CONTENT.strip_heredoc
+            A
+            BB
+            C
+          CONTENT
+        )
+      end
+
+      let(:update_second_file_line_commit) do
+        update_line_commit
+
+        update_file(
+          branch_name,
+          second_file_name,
+          <<-CONTENT.strip_heredoc
+            D
+            EE
+          CONTENT
+        )
+      end
+
+      let(:move_line_commit) do
+        update_second_file_line_commit
+
+        update_file(
+          branch_name,
+          file_name,
+          <<-CONTENT.strip_heredoc
+            BB
+            A
+            C
+          CONTENT
+        )
+      end
+
+      let(:add_second_file_line_commit) do
+        move_line_commit
+
+        update_file(
+          branch_name,
+          second_file_name,
+          <<-CONTENT.strip_heredoc
+            D
+            EE
+            F
+          CONTENT
+        )
+      end
+
+      let(:move_second_file_line_commit) do
+        add_second_file_line_commit
+
+        update_file(
+          branch_name,
+          second_file_name,
+          <<-CONTENT.strip_heredoc
+            D
+            F
+            EE
+          CONTENT
+        )
+      end
+
+      let(:delete_line_commit) do
+        move_second_file_line_commit
+
+        update_file(
+          branch_name,
+          file_name,
+          <<-CONTENT.strip_heredoc
+            BB
+            A
+          CONTENT
+        )
+      end
+
+      let(:delete_second_file_line_commit) do
+        delete_line_commit
+
+        update_file(
+          branch_name,
+          second_file_name,
+          <<-CONTENT.strip_heredoc
+            D
+            F
+          CONTENT
+        )
+      end
+
+      let(:delete_file_commit) do
+        delete_second_file_line_commit
+
+        delete_file(branch_name, file_name)
+      end
+
+      let(:rename_file_commit) do
+        delete_file_commit
+
+        create_file(
+          branch_name,
+          new_file_name,
+          <<-CONTENT.strip_heredoc
+            BB
+            A
+          CONTENT
+        )
+      end
+
+      let(:update_line_again_commit) do
+        rename_file_commit
+
+        update_file(
+          branch_name,
+          new_file_name,
+          <<-CONTENT.strip_heredoc
+            BB
+            AA
+          CONTENT
+        )
+      end
+
+      let(:move_line_again_commit) do
+        update_line_again_commit
+
+        update_file(
+          branch_name,
+          new_file_name,
+          <<-CONTENT.strip_heredoc
+            AA
+            BB
+          CONTENT
+        )
+      end
+
+      let(:delete_line_again_commit) do
+        move_line_again_commit
+
+        update_file(
+          branch_name,
+          new_file_name,
+          <<-CONTENT.strip_heredoc
+            AA
+          CONTENT
+        )
+      end
+
+      context "when the file was created in the old diff" do
+        context "when the file is created in the new diff" do
+          context "when the position pointed at an added line in the old diff" do
+            context "when the file's content was unchanged between the old and the new diff" do
+              let(:old_diff_refs) { diff_refs(initial_commit, create_file_commit) }
+              let(:new_diff_refs) { diff_refs(initial_commit, create_second_file_commit) }
+              let(:old_position) { position(new_path: file_name, new_line: 2) }
+
+              # old diff:
+              #   1 + A
+              #   2 + B
+              #   3 + C
+              #
+              # new diff:
+              #   1 + A
+              #   2 + B
+              #   3 + C
+
+              it "returns the new position" do
+                expect_new_position(
+                  new_path: old_position.new_path,
+                  new_line: old_position.new_line
+                )
+              end
+            end
+
+            context "when the file's content was changed between the old and the new diff" do
+              context "when that line was unchanged between the old and the new diff" do
+                let(:old_diff_refs) { diff_refs(initial_commit, create_file_commit) }
+                let(:new_diff_refs) { diff_refs(initial_commit, update_line_commit) }
+                let(:old_position) { position(new_path: file_name, new_line: 1) }
+
+                # old diff:
+                #   1 + A
+                #   2 + B
+                #   3 + C
+                #
+                # new diff:
+                #   1 + A
+                #   2 + BB
+                #   3 + C
+
+                it "returns the new position" do
+                  expect_new_position(
+                    new_path: old_position.new_path,
+                    new_line: old_position.new_line
+                  )
+                end
+              end
+
+              context "when that line was moved between the old and the new diff" do
+                let(:old_diff_refs) { diff_refs(initial_commit, update_line_commit) }
+                let(:new_diff_refs) { diff_refs(initial_commit, move_line_commit) }
+                let(:old_position) { position(new_path: file_name, new_line: 2) }
+
+                # old diff:
+                #   1 + A
+                #   2 + BB
+                #   3 + C
+                #
+                # new diff:
+                #   1 + BB
+                #   2 + A
+                #   3 + C
+
+                it "returns the new position" do
+                  expect_new_position(
+                    new_path: old_position.new_path,
+                    new_line: 1
+                  )
+                end
+              end
+
+              context "when that line was changed between the old and the new diff" do
+                let(:old_diff_refs) { diff_refs(initial_commit, create_file_commit) }
+                let(:new_diff_refs) { diff_refs(initial_commit, update_line_commit) }
+                let(:change_diff_refs) { diff_refs(create_file_commit, update_line_commit) }
+                let(:old_position) { position(new_path: file_name, new_line: 2) }
+
+                # old diff:
+                #   1 + A
+                #   2 + B
+                #   3 + C
+                #
+                # new diff:
+                #   1 + A
+                #   2 + BB
+                #   3 + C
+
+                it "returns the position of the change" do
+                  expect_change_position(
+                    old_path: file_name,
+                    new_path: file_name,
+                    old_line: 2,
+                    new_line: nil
+                  )
+                end
+              end
+
+              context "when that line was deleted between the old and the new diff" do
+                let(:old_diff_refs) { diff_refs(initial_commit, update_line_commit) }
+                let(:new_diff_refs) { diff_refs(initial_commit, delete_line_commit) }
+                let(:change_diff_refs) { diff_refs(update_line_commit, delete_line_commit) }
+                let(:old_position) { position(new_path: file_name, new_line: 3) }
+
+                # old diff:
+                #   1 + A
+                #   2 + BB
+                #   3 + C
+                #
+                # new diff:
+                #   1 + A
+                #   2 + BB
+
+                it "returns the position of the change" do
+                  expect_change_position(
+                    old_path: file_name,
+                    new_path: file_name,
+                    old_line: 3,
+                    new_line: nil
+                  )
+                end
+              end
+            end
+          end
+        end
+
+        context "when the file is changed in the new diff" do
+          context "when the position pointed at an added line in the old diff" do
+            context "when the file's content was unchanged between the old and the new diff" do
+              let(:old_diff_refs) { diff_refs(initial_commit, update_line_commit) }
+              let(:new_diff_refs) { diff_refs(create_file_commit, update_line_commit) }
+              let(:old_position) { position(new_path: file_name, new_line: 1) }
+
+              # old diff:
+              #   1 + A
+              #   2 + BB
+              #   3 + C
+              #
+              # new diff:
+              # 1 1   A
+              # 2   - B
+              #   2 + BB
+              # 3 3   C
+
+              it "returns the new position" do
+                expect_new_position(
+                  new_path: old_position.new_path,
+                  new_line: old_position.new_line
+                )
+              end
+            end
+
+            context "when the file's content was changed between the old and the new diff" do
+              context "when that line was unchanged between the old and the new diff" do
+                let(:old_diff_refs) { diff_refs(initial_commit, update_line_commit) }
+                let(:new_diff_refs) { diff_refs(update_line_commit, move_line_commit) }
+                let(:old_position) { position(new_path: file_name, new_line: 3) }
+
+                # old diff:
+                #   1 + A
+                #   2 + BB
+                #   3 + C
+                #
+                # new diff:
+                # 1   - A
+                # 2 1   BB
+                #   2 + A
+                # 3 3   C
+
+                it "returns the new position" do
+                  expect_new_position(
+                    new_path: old_position.new_path,
+                    new_line: old_position.new_line
+                  )
+                end
+              end
+
+              context "when that line was moved between the old and the new diff" do
+                let(:old_diff_refs) { diff_refs(initial_commit, update_line_commit) }
+                let(:new_diff_refs) { diff_refs(update_line_commit, move_line_commit) }
+                let(:old_position) { position(new_path: file_name, new_line: 2) }
+
+                # old diff:
+                #   1 + A
+                #   2 + BB
+                #   3 + C
+                #
+                # new diff:
+                # 1   - A
+                # 2 1   BB
+                #   2 + A
+                # 3 3   C
+
+                it "returns the new position" do
+                  expect_new_position(
+                    new_path: old_position.new_path,
+                    new_line: 1
+                  )
+                end
+              end
+
+              context "when that line was changed between the old and the new diff" do
+                let(:old_diff_refs) { diff_refs(initial_commit, create_file_commit) }
+                let(:new_diff_refs) { diff_refs(create_file_commit, update_line_commit) }
+                let(:change_diff_refs) { diff_refs(create_file_commit, update_line_commit) }
+                let(:old_position) { position(new_path: file_name, new_line: 2) }
+
+                # old diff:
+                #   1 + A
+                #   2 + B
+                #   3 + C
+                #
+                # new diff:
+                # 1 1   A
+                # 2   - B
+                #   2 + BB
+                # 3 3   C
+
+                it "returns the position of the change" do
+                  expect_change_position(
+                    old_path: file_name,
+                    new_path: file_name,
+                    old_line: 2,
+                    new_line: nil
+                  )
+                end
+              end
+
+              context "when that line was deleted between the old and the new diff" do
+                let(:old_diff_refs) { diff_refs(initial_commit, move_line_commit) }
+                let(:new_diff_refs) { diff_refs(move_line_commit, delete_line_commit) }
+                let(:change_diff_refs) { diff_refs(move_line_commit, delete_line_commit) }
+                let(:old_position) { position(new_path: file_name, new_line: 3) }
+
+                # old diff:
+                #   1 + BB
+                #   2 + A
+                #   3 + C
+                #
+                # new diff:
+                # 1 1   BB
+                # 2 2   A
+                # 3   - C
+
+                it "returns the position of the change" do
+                  expect_change_position(
+                    old_path: file_name,
+                    new_path: file_name,
+                    old_line: 3,
+                    new_line: nil
+                  )
+                end
+              end
+            end
+          end
+        end
+
+        context "when the file is renamed in the new diff" do
+          context "when the position pointed at an added line in the old diff" do
+            context "when the file's content was unchanged between the old and the new diff" do
+              let(:old_diff_refs) { diff_refs(initial_commit, delete_line_commit) }
+              let(:new_diff_refs) { diff_refs(delete_line_commit, rename_file_commit) }
+              let(:change_diff_refs) { diff_refs(initial_commit, delete_line_commit) }
+              let(:old_position) { position(new_path: file_name, new_line: 2) }
+
+              # old diff:
+              #   1 + BB
+              #   2 + A
+              #
+              # new diff:
+              # file_name -> new_file_name
+              # 1 1   BB
+              # 2 2   A
+
+              it "returns the position of the change" do
+                expect_change_position(
+                  old_path: file_name,
+                  new_path: file_name,
+                  old_line: nil,
+                  new_line: 2
+                )
+              end
+            end
+
+            context "when the file's content was changed between the old and the new diff" do
+              context "when that line was unchanged between the old and the new diff" do
+                let(:old_diff_refs) { diff_refs(initial_commit, delete_line_commit) }
+                let(:new_diff_refs) { diff_refs(delete_line_commit, update_line_again_commit) }
+                let(:old_position) { position(new_path: file_name, new_line: 1) }
+
+                # old diff:
+                #   1 + BB
+                #   2 + A
+                #
+                # new diff:
+                # file_name -> new_file_name
+                # 1 1   BB
+                # 2   - A
+                #   2 + AA
+
+                it "returns the new position" do
+                  expect_new_position(
+                    old_path: file_name,
+                    new_path: new_file_name,
+                    old_line: old_position.new_line,
+                    new_line: old_position.new_line
+                  )
+                end
+              end
+
+              context "when that line was moved between the old and the new diff" do
+                let(:old_diff_refs) { diff_refs(initial_commit, delete_line_commit) }
+                let(:new_diff_refs) { diff_refs(delete_line_commit, move_line_again_commit) }
+                let(:old_position) { position(new_path: file_name, new_line: 1) }
+
+                # old diff:
+                #   1 + BB
+                #   2 + A
+                #
+                # new diff:
+                # file_name -> new_file_name
+                #   1 + AA
+                # 1 2   BB
+                # 2   - A
+
+                it "returns the new position" do
+                  expect_new_position(
+                    old_path: file_name,
+                    new_path: new_file_name,
+                    old_line: 1,
+                    new_line: 2
+                  )
+                end
+              end
+
+              context "when that line was changed between the old and the new diff" do
+                let(:old_diff_refs) { diff_refs(initial_commit, delete_line_commit) }
+                let(:new_diff_refs) { diff_refs(delete_line_commit, update_line_again_commit) }
+                let(:change_diff_refs) { diff_refs(delete_line_commit, update_line_again_commit) }
+                let(:old_position) { position(new_path: file_name, new_line: 2) }
+
+                # old diff:
+                #   1 + BB
+                #   2 + A
+                #
+                # new diff:
+                # file_name -> new_file_name
+                # 1 1   BB
+                # 2   - A
+                #   2 + AA
+
+                it "returns the position of the change" do
+                  expect_change_position(
+                    old_path: file_name,
+                    new_path: new_file_name,
+                    old_line: 2,
+                    new_line: nil
+                  )
+                end
+              end
+            end
+          end
+        end
+
+        context "when the file is deleted in the new diff" do
+          context "when the position pointed at an added line in the old diff" do
+            context "when the file's content was unchanged between the old and the new diff" do
+              let(:old_diff_refs) { diff_refs(initial_commit, delete_line_commit) }
+              let(:new_diff_refs) { diff_refs(delete_line_commit, delete_file_commit) }
+              let(:change_diff_refs) { diff_refs(delete_line_commit, delete_file_commit) }
+              let(:old_position) { position(new_path: file_name, new_line: 2) }
+
+              # old diff:
+              #   1 + BB
+              #   2 + A
+              #
+              # new diff:
+              # 1   - BB
+              # 2   - A
+
+              it "returns the position of the change" do
+                expect_change_position(
+                  old_path: file_name,
+                  new_path: file_name,
+                  old_line: 2,
+                  new_line: nil
+                )
+              end
+            end
+
+            context "when the file's content was changed between the old and the new diff" do
+              context "when that line was unchanged between the old and the new diff" do
+                let(:old_diff_refs) { diff_refs(initial_commit, move_line_commit) }
+                let(:new_diff_refs) { diff_refs(delete_line_commit, delete_file_commit) }
+                let(:change_diff_refs) { diff_refs(move_line_commit, delete_file_commit) }
+                let(:old_position) { position(new_path: file_name, new_line: 2) }
+
+                # old diff:
+                #   1 + BB
+                #   2 + A
+                #   3 + C
+                #
+                # new diff:
+                # 1   - BB
+                # 2   - A
+
+                it "returns the position of the change" do
+                  expect_change_position(
+                    old_path: file_name,
+                    new_path: file_name,
+                    old_line: 2,
+                    new_line: nil
+                  )
+                end
+              end
+
+              context "when that line was moved between the old and the new diff" do
+                let(:old_diff_refs) { diff_refs(initial_commit, update_line_commit) }
+                let(:new_diff_refs) { diff_refs(move_line_commit, delete_file_commit) }
+                let(:change_diff_refs) { diff_refs(update_line_commit, delete_file_commit) }
+                let(:old_position) { position(new_path: file_name, new_line: 2) }
+
+                # old diff:
+                #   1 + A
+                #   2 + BB
+                #   3 + C
+                #
+                # new diff:
+                # 1   - BB
+                # 2   - A
+                # 3   - C
+
+                it "returns the position of the change" do
+                  expect_change_position(
+                    old_path: file_name,
+                    new_path: file_name,
+                    old_line: 2,
+                    new_line: nil
+                  )
+                end
+              end
+
+              context "when that line was changed between the old and the new diff" do
+                let(:old_diff_refs) { diff_refs(initial_commit, create_file_commit) }
+                let(:new_diff_refs) { diff_refs(update_line_commit, delete_file_commit) }
+                let(:change_diff_refs) { diff_refs(create_file_commit, delete_file_commit) }
+                let(:old_position) { position(new_path: file_name, new_line: 2) }
+
+                # old diff:
+                #   1 + A
+                #   2 + B
+                #   3 + C
+                #
+                # new diff:
+                # 1   - A
+                # 2   - BB
+                # 3   - C
+
+                it "returns the position of the change" do
+                  expect_change_position(
+                    old_path: file_name,
+                    new_path: file_name,
+                    old_line: 2,
+                    new_line: nil
+                  )
+                end
+              end
+
+              context "when that line was deleted between the old and the new diff" do
+                let(:old_diff_refs) { diff_refs(initial_commit, move_line_commit) }
+                let(:new_diff_refs) { diff_refs(delete_line_commit, delete_file_commit) }
+                let(:change_diff_refs) { diff_refs(move_line_commit, delete_file_commit) }
+                let(:old_position) { position(new_path: file_name, new_line: 3) }
+
+                # old diff:
+                #   1 + BB
+                #   2 + A
+                #   3 + C
+                #
+                # new diff:
+                # 1   - BB
+                # 2   - A
+
+                it "returns the position of the change" do
+                  expect_change_position(
+                    old_path: file_name,
+                    new_path: file_name,
+                    old_line: 3,
+                    new_line: nil
+                  )
+                end
+              end
+            end
+          end
+        end
+
+        context "when the file is unchanged in the new diff" do
+          context "when the position pointed at an added line in the old diff" do
+            context "when the file's content was unchanged between the old and the new diff" do
+              let(:old_diff_refs) { diff_refs(initial_commit, create_file_commit) }
+              let(:new_diff_refs) { diff_refs(create_file_commit, create_second_file_commit) }
+              let(:change_diff_refs) { diff_refs(initial_commit, create_file_commit) }
+              let(:old_position) { position(new_path: file_name, new_line: 2) }
+
+              # old diff:
+              #   1 + A
+              #   2 + B
+              #   3 + C
+              #
+              # new diff:
+              # 1 1   A
+              # 2 2   B
+              # 3 3   C
+
+              it "returns the position of the change" do
+                expect_change_position(
+                  old_path: file_name,
+                  new_path: file_name,
+                  old_line: nil,
+                  new_line: 2
+                )
+              end
+            end
+
+            context "when the file's content was changed between the old and the new diff" do
+              context "when that line was unchanged between the old and the new diff" do
+                let(:old_diff_refs) { diff_refs(initial_commit, create_file_commit) }
+                let(:new_diff_refs) { diff_refs(update_line_commit, update_second_file_line_commit) }
+                let(:change_diff_refs) { diff_refs(initial_commit, update_line_commit) }
+                let(:old_position) { position(new_path: file_name, new_line: 1) }
+
+                # old diff:
+                #   1 + A
+                #   2 + B
+                #   3 + C
+                #
+                # new diff:
+                # 1 1   A
+                # 2 2   BB
+                # 3 3   C
+
+                it "returns the position of the change" do
+                  expect_change_position(
+                    old_path: file_name,
+                    new_path: file_name,
+                    old_line: nil,
+                    new_line: 1
+                  )
+                end
+              end
+
+              context "when that line was moved between the old and the new diff" do
+                let(:old_diff_refs) { diff_refs(initial_commit, update_line_commit) }
+                let(:new_diff_refs) { diff_refs(move_line_commit, move_second_file_line_commit) }
+                let(:change_diff_refs) { diff_refs(initial_commit, move_line_commit) }
+                let(:old_position) { position(new_path: file_name, new_line: 2) }
+
+                # old diff:
+                #   1 + A
+                #   2 + BB
+                #   3 + C
+                #
+                # new diff:
+                # 1 1   BB
+                # 2 2   A
+                # 3 3   C
+
+                it "returns the position of the change" do
+                  expect_change_position(
+                    old_path: file_name,
+                    new_path: file_name,
+                    old_line: nil,
+                    new_line: 1
+                  )
+                end
+              end
+
+              context "when that line was changed between the old and the new diff" do
+                let(:old_diff_refs) { diff_refs(initial_commit, create_file_commit) }
+                let(:new_diff_refs) { diff_refs(update_line_commit, update_second_file_line_commit) }
+                let(:change_diff_refs) { diff_refs(create_file_commit, update_second_file_line_commit) }
+                let(:old_position) { position(new_path: file_name, new_line: 2) }
+
+                # old diff:
+                #   1 + A
+                #   2 + B
+                #   3 + C
+                #
+                # new diff:
+                # 1 1   A
+                # 2 2   BB
+                # 3 3   C
+
+                it "returns the position of the change" do
+                  expect_change_position(
+                    old_path: file_name,
+                    new_path: file_name,
+                    old_line: 2,
+                    new_line: nil
+                  )
+                end
+              end
+
+              context "when that line was deleted between the old and the new diff" do
+                let(:old_diff_refs) { diff_refs(initial_commit, move_line_commit) }
+                let(:new_diff_refs) { diff_refs(delete_line_commit, delete_second_file_line_commit) }
+                let(:change_diff_refs) { diff_refs(move_line_commit, delete_second_file_line_commit) }
+                let(:old_position) { position(new_path: file_name, new_line: 3) }
+
+                # old diff:
+                #   1 + BB
+                #   2 + A
+                #   3 + C
+                #
+                # new diff:
+                # 1 1   BB
+                # 2 2   A
+
+                it "returns the position of the change" do
+                  expect_change_position(
+                    old_path: file_name,
+                    new_path: file_name,
+                    old_line: 3,
+                    new_line: nil
+                  )
+                end
+              end
+            end
+          end
+        end
+      end
+
+      context "when the file was changed in the old diff" do
+        context "when the file is created in the new diff" do
+          context "when the position pointed at an added line in the old diff" do
+            context "when the file's content was unchanged between the old and the new diff" do
+              let(:old_diff_refs) { diff_refs(create_file_commit, update_line_commit) }
+              let(:new_diff_refs) { diff_refs(initial_commit, update_line_commit) }
+              let(:old_position) { position(old_path: file_name, new_path: file_name, new_line: 2) }
+
+              # old diff:
+              # 1 1   A
+              # 2   - B
+              #   2 + BB
+              # 3 3   C
+              #
+              # new diff:
+              #   1 + A
+              #   2 + BB
+              #   3 + C
+
+              it "returns the new position" do
+                expect_new_position(
+                  new_path: old_position.new_path,
+                  old_line: nil,
+                  new_line: old_position.new_line
+                )
+              end
+            end
+
+            context "when the file's content was changed between the old and the new diff" do
+              context "when that line was unchanged between the old and the new diff" do
+                let(:old_diff_refs) { diff_refs(create_file_commit, move_line_commit) }
+                let(:new_diff_refs) { diff_refs(initial_commit, move_line_commit) }
+                let(:old_position) { position(old_path: file_name, new_path: file_name, new_line: 1) }
+
+                # old diff:
+                #   1 + BB
+                # 1 2   A
+                # 2   - B
+                # 3 3   C
+                #
+                # new diff:
+                #   1 + BB
+                #   2 + A
+
+                it "returns the new position" do
+                  expect_new_position(
+                    new_path: old_position.new_path,
+                    old_line: nil,
+                    new_line: old_position.new_line
+                  )
+                end
+              end
+
+              context "when that line was moved between the old and the new diff" do
+                let(:old_diff_refs) { diff_refs(create_file_commit, update_line_commit) }
+                let(:new_diff_refs) { diff_refs(initial_commit, move_line_commit) }
+                let(:old_position) { position(old_path: file_name, new_path: file_name, new_line: 2) }
+
+                # old diff:
+                # 1 1   A
+                # 2   - B
+                #   2 + BB
+                # 3 3   C
+                #
+                # new diff:
+                #   1 + BB
+                #   2 + A
+                #   3 + C
+
+                it "returns the new position" do
+                  expect_new_position(
+                    new_path: old_position.new_path,
+                    old_line: nil,
+                    new_line: 1
+                  )
+                end
+              end
+
+              context "when that line was changed or deleted between the old and the new diff" do
+                let(:old_diff_refs) { diff_refs(create_file_commit, move_line_commit) }
+                let(:new_diff_refs) { diff_refs(initial_commit, create_file_commit) }
+                let(:change_diff_refs) { diff_refs(move_line_commit, create_file_commit) }
+                let(:old_position) { position(old_path: file_name, new_path: file_name, new_line: 1) }
+
+                # old diff:
+                #   1 + BB
+                # 1 2   A
+                # 2   - B
+                # 3 3   C
+                #
+                # new diff:
+                #   1 + A
+                #   2 + B
+                #   3 + C
+
+                it "returns the position of the change" do
+                  expect_change_position(
+                    old_path: file_name,
+                    new_path: file_name,
+                    old_line: 1,
+                    new_line: nil
+                  )
+                end
+              end
+            end
+          end
+
+          context "when the position pointed at a deleted line in the old diff" do
+            let(:old_diff_refs) { diff_refs(create_file_commit, update_line_commit) }
+            let(:new_diff_refs) { diff_refs(initial_commit, update_line_commit) }
+            let(:change_diff_refs) { diff_refs(create_file_commit, initial_commit) }
+            let(:old_position) { position(old_path: file_name, new_path: file_name, old_line: 2) }
+
+            # old diff:
+            # 1 1   A
+            # 2   - B
+            #   2 + BB
+            # 3 3   C
+            #
+            # new diff:
+            #   1 + A
+            #   2 + BB
+            #   3 + C
+
+            it "returns the position of the change" do
+              expect_change_position(
+                old_path: file_name,
+                new_path: file_name,
+                old_line: 2,
+                new_line: nil
+              )
+            end
+          end
+
+          context "when the position pointed at an unchanged line in the old diff" do
+            context "when the file's content was unchanged between the old and the new diff" do
+              let(:old_diff_refs) { diff_refs(create_file_commit, update_line_commit) }
+              let(:new_diff_refs) { diff_refs(initial_commit, update_line_commit) }
+              let(:old_position) { position(old_path: file_name, new_path: file_name, old_line: 1, new_line: 1) }
+
+              # old diff:
+              # 1 1   A
+              # 2   - B
+              #   2 + BB
+              # 3 3   C
+              #
+              # new diff:
+              #   1 + A
+              #   2 + BB
+              #   3 + C
+
+              it "returns the new position" do
+                expect_new_position(
+                  new_path: old_position.new_path,
+                  old_line: nil,
+                  new_line: old_position.new_line
+                )
+              end
+            end
+
+            context "when the file's content was changed between the old and the new diff" do
+              context "when that line was unchanged between the old and the new diff" do
+                let(:old_diff_refs) { diff_refs(create_file_commit, move_line_commit) }
+                let(:new_diff_refs) { diff_refs(initial_commit, move_line_commit) }
+                let(:old_position) { position(old_path: file_name, new_path: file_name, old_line: 1, new_line: 2) }
+
+                # old diff:
+                #   1 + BB
+                # 1 2   A
+                # 2   - B
+                # 3 3   C
+                #
+                # new diff:
+                #   1 + BB
+                #   2 + A
+
+                it "returns the new position" do
+                  expect_new_position(
+                    new_path: old_position.new_path,
+                    old_line: nil,
+                    new_line: old_position.new_line
+                  )
+                end
+              end
+
+              context "when that line was moved between the old and the new diff" do
+                let(:old_diff_refs) { diff_refs(move_line_commit, delete_line_commit) }
+                let(:new_diff_refs) { diff_refs(initial_commit, update_line_commit) }
+                let(:old_position) { position(old_path: file_name, new_path: file_name, old_line: 2, new_line: 2) }
+
+                # old diff:
+                # 1 1   BB
+                # 2 2   A
+                # 3   - C
+                #
+                # new diff:
+                #   1 + A
+                #   2 + BB
+                #   3 + C
+
+                it "returns the new position" do
+                  expect_new_position(
+                    new_path: old_position.new_path,
+                    old_line: nil,
+                    new_line: 1
+                  )
+                end
+              end
+
+              context "when that line was changed or deleted between the old and the new diff" do
+                let(:old_diff_refs) { diff_refs(create_file_commit, move_line_commit) }
+                let(:new_diff_refs) { diff_refs(initial_commit, delete_line_commit) }
+                let(:change_diff_refs) { diff_refs(move_line_commit, delete_line_commit) }
+                let(:old_position) { position(old_path: file_name, new_path: file_name, old_line: 3, new_line: 3) }
+
+                # old diff:
+                #   1 + BB
+                # 1 2   A
+                # 2   - B
+                # 3 3   C
+                #
+                # new diff:
+                #   1 + A
+                #   2 + B
+
+                it "returns the position of the change" do
+                  expect_change_position(
+                    old_path: file_name,
+                    new_path: file_name,
+                    old_line: 3,
+                    new_line: nil
+                  )
+                end
+              end
+            end
+          end
+        end
+
+        context "when the file is changed in the new diff" do
+          context "when the position pointed at an added line in the old diff" do
+            context "when the file's content was unchanged between the old and the new diff" do
+              let(:old_diff_refs) { diff_refs(create_file_commit, update_line_commit) }
+              let(:new_diff_refs) { diff_refs(create_file_commit, update_second_file_line_commit) }
+              let(:old_position) { position(old_path: file_name, new_path: file_name, new_line: 2) }
+
+              # old diff:
+              # 1 1   A
+              # 2   - B
+              #   2 + BB
+              # 3 3   C
+              #
+              # new diff:
+              # 1 1   A
+              # 2   - B
+              #   2 + BB
+              # 3 3   C
+
+              it "returns the new position" do
+                expect_new_position(
+                  old_path: old_position.old_path,
+                  new_path: old_position.new_path,
+                  old_line: nil,
+                  new_line: old_position.new_line
+                )
+              end
+            end
+
+            context "when the file's content was changed between the old and the new diff" do
+              context "when that line was unchanged between the old and the new diff" do
+                let(:old_diff_refs) { diff_refs(create_file_commit, move_line_commit) }
+                let(:new_diff_refs) { diff_refs(move_line_commit, delete_line_commit) }
+                let(:old_position) { position(old_path: file_name, new_path: file_name, new_line: 1) }
+
+                # old diff:
+                #   1 + BB
+                # 1 2   A
+                # 2   - B
+                # 3 3   C
+                #
+                # new diff:
+                # 1 1   BB
+                # 2 2   A
+                # 3   - C
+
+                it "returns the new position" do
+                  expect_new_position(
+                    old_path: old_position.old_path,
+                    new_path: old_position.new_path,
+                    old_line: 1,
+                    new_line: 1
+                  )
+                end
+              end
+
+              context "when that line was moved between the old and the new diff" do
+                let(:old_diff_refs) { diff_refs(create_file_commit, update_line_commit) }
+                let(:new_diff_refs) { diff_refs(update_line_commit, move_line_commit) }
+                let(:old_position) { position(old_path: file_name, new_path: file_name, new_line: 2) }
+
+                # old diff:
+                # 1 1   A
+                # 2   - B
+                #   2 + BB
+                # 3 3   C
+                #
+                # new diff:
+                # 1   - A
+                # 2 1   BB
+                #   2 + A
+                # 3 3   C
+
+                it "returns the new position" do
+                  expect_new_position(
+                    old_path: old_position.old_path,
+                    new_path: old_position.new_path,
+                    old_line: 2,
+                    new_line: 1
+                  )
+                end
+              end
+
+              context "when that line was changed or deleted between the old and the new diff" do
+                let(:old_diff_refs) { diff_refs(create_file_commit, move_line_commit) }
+                let(:new_diff_refs) { diff_refs(create_file_commit, update_line_commit) }
+                let(:change_diff_refs) { diff_refs(move_line_commit, update_line_commit) }
+                let(:old_position) { position(old_path: file_name, new_path: file_name, new_line: 1) }
+
+                # old diff:
+                #   1 + BB
+                # 1 2   A
+                # 2   - B
+                # 3 3   C
+                #
+                # new diff:
+                # 1 1   A
+                # 2   - B
+                #   2 + BB
+                # 3 3   C
+
+                it "returns the position of the change" do
+                  expect_change_position(
+                    old_path: file_name,
+                    new_path: file_name,
+                    old_line: 1,
+                    new_line: nil
+                  )
+                end
+              end
+            end
+          end
+
+          context "when the position pointed at a deleted line in the old diff" do
+            context "when the file's content was unchanged between the old and the new diff" do
+              let(:old_diff_refs) { diff_refs(create_file_commit, update_line_commit) }
+              let(:new_diff_refs) { diff_refs(create_file_commit, update_second_file_line_commit) }
+              let(:old_position) { position(old_path: file_name, new_path: file_name, old_line: 2) }
+
+              # old diff:
+              # 1 1   A
+              # 2   - B
+              #   2 + BB
+              # 3 3   C
+              #
+              # new diff:
+              # 1 1   A
+              # 2   - B
+              #   2 + BB
+              # 3 3   C
+
+              it "returns the new position" do
+                expect_new_position(
+                  old_path: old_position.old_path,
+                  new_path: old_position.new_path,
+                  old_line: old_position.old_line,
+                  new_line: nil
+                )
+              end
+            end
+          end
+        end
+      end
+    end
+
+    describe "typical use scenarios" do
+      let(:second_branch_name) { "#{branch_name}-2" }
+
+      def expect_new_positions(old_attrs, new_attrs)
+        old_positions = old_attrs.map do |old_attrs|
+          position(old_attrs)
+        end
+
+        new_positions = old_positions.map do |old_position|
+          strategy.trace(old_position)
+        end
+
+        aggregate_failures do
+          new_positions.zip(new_attrs).each do |new_position, new_attrs|
+            if new_attrs&.delete(:change)
+              expect_change_position(new_attrs, new_position)
+            else
+              expect_new_position(new_attrs, new_position)
+            end
+          end
+        end
+      end
+
+      let(:create_file_commit) do
+        initial_commit
+
+        create_file(
+          branch_name,
+          file_name,
+          <<-CONTENT.strip_heredoc
+            A
+            B
+            C
+            D
+            E
+            F
+          CONTENT
+        )
+      end
+
+      let(:second_create_file_commit) do
+        create_file_commit
+
+        create_branch(second_branch_name, branch_name)
+
+        update_file(
+          second_branch_name,
+          file_name,
+          <<-CONTENT.strip_heredoc
+            Z
+            Z
+            Z
+            A
+            B
+            C
+            D
+            E
+            F
+          CONTENT
+        )
+      end
+
+      let(:update_file_commit) do
+        second_create_file_commit
+
+        update_file(
+          branch_name,
+          file_name,
+          <<-CONTENT.strip_heredoc
+            A
+            C
+            DD
+            E
+            F
+            G
+          CONTENT
+        )
+      end
+
+      let(:update_file_again_commit) do
+        update_file_commit
+
+        update_file(
+          branch_name,
+          file_name,
+          <<-CONTENT.strip_heredoc
+            A
+            BB
+            C
+            D
+            E
+            FF
+            G
+          CONTENT
+        )
+      end
+
+      describe "simple push of new commit" do
+        let(:old_diff_refs) { diff_refs(create_file_commit, update_file_commit) }
+        let(:new_diff_refs) { diff_refs(create_file_commit, update_file_again_commit) }
+        let(:change_diff_refs) { diff_refs(update_file_commit, update_file_again_commit) }
+
+        # old diff:
+        # 1 1   A
+        # 2   - B
+        # 3 2   C
+        # 4   - D
+        #   3 + DD
+        # 5 4   E
+        # 6 5   F
+        #   6 + G
+        #
+        # new diff:
+        # 1 1   A
+        # 2   - B
+        #   2 + BB
+        # 3 3   C
+        # 4 4   D
+        # 5 5   E
+        # 6   - F
+        #   6 + FF
+        #   7 + G
+
+        it "returns the new positions" do
+          old_position_attrs = [
+            { old_path: file_name, new_path: file_name, old_line: 1, new_line: 1 }, #   A
+            { old_path: file_name,                      old_line: 2              }, # - B
+            { old_path: file_name, new_path: file_name, old_line: 3, new_line: 2 }, #   C
+            { old_path: file_name,                      old_line: 4              }, # - D
+            {                      new_path: file_name,              new_line: 3 }, # + DD
+            { old_path: file_name, new_path: file_name, old_line: 5, new_line: 4 }, #   E
+            { old_path: file_name, new_path: file_name, old_line: 6, new_line: 5 }, #   F
+            {                      new_path: file_name,              new_line: 6 } # + G
+          ]
+
+          new_position_attrs = [
+            { old_path: file_name, new_path: file_name, old_line: 1, new_line: 1 },
+            { old_path: file_name,                      old_line: 2              },
+            { old_path: file_name, new_path: file_name, old_line: 3, new_line: 3 },
+            {                      new_path: file_name,              new_line: 4,   change: true },
+            {                      new_path: file_name, old_line: 3,                change: true },
+            { old_path: file_name, new_path: file_name, old_line: 5, new_line: 5 },
+            {                      new_path: file_name, old_line: 5, change: true },
+            {                      new_path: file_name, new_line: 7 }
+          ]
+
+          expect_new_positions(old_position_attrs, new_position_attrs)
+        end
+      end
+
+      describe "force push to overwrite last commit" do
+        let(:second_create_file_commit) do
+          create_file_commit
+
+          create_branch(second_branch_name, branch_name)
+
+          update_file(
+            second_branch_name,
+            file_name,
+            <<-CONTENT.strip_heredoc
+              A
+              BB
+              C
+              D
+              E
+              FF
+              G
+            CONTENT
+          )
+        end
+
+        let(:old_diff_refs) { diff_refs(create_file_commit, update_file_commit) }
+        let(:new_diff_refs) { diff_refs(create_file_commit, second_create_file_commit) }
+        let(:change_diff_refs) { diff_refs(update_file_commit, second_create_file_commit) }
+
+        # old diff:
+        # 1 1   A
+        # 2   - B
+        # 3 2   C
+        # 4   - D
+        #   3 + DD
+        # 5 4   E
+        # 6 5   F
+        #   6 + G
+        #
+        # new diff:
+        # 1 1   A
+        # 2   - B
+        #   2 + BB
+        # 3 3   C
+        # 4 4   D
+        # 5 5   E
+        # 6   - F
+        #   6 + FF
+        #   7 + G
+
+        it "returns the new positions" do
+          old_position_attrs = [
+            { old_path: file_name, new_path: file_name, old_line: 1, new_line: 1 }, #   A
+            { old_path: file_name,                      old_line: 2              }, # - B
+            { old_path: file_name, new_path: file_name, old_line: 3, new_line: 2 }, #   C
+            { old_path: file_name,                      old_line: 4              }, # - D
+            {                      new_path: file_name,              new_line: 3 }, # + DD
+            { old_path: file_name, new_path: file_name, old_line: 5, new_line: 4 }, #   E
+            { old_path: file_name, new_path: file_name, old_line: 6, new_line: 5 }, #   F
+            {                      new_path: file_name,              new_line: 6 } # + G
+          ]
+
+          new_position_attrs = [
+            { old_path: file_name, new_path: file_name, old_line: 1, new_line: 1 },
+            { old_path: file_name,                      old_line: 2              },
+            { old_path: file_name, new_path: file_name, old_line: 3, new_line: 3 },
+            {                      new_path: file_name,              new_line: 4,   change: true },
+            { old_path: file_name,                      old_line: 3,                change: true },
+            { old_path: file_name, new_path: file_name, old_line: 5, new_line: 5 },
+            { old_path: file_name,                      old_line: 5, change: true },
+            {                      new_path: file_name,              new_line: 7 }
+          ]
+
+          expect_new_positions(old_position_attrs, new_position_attrs)
+        end
+      end
+
+      describe "force push to delete last commit" do
+        let(:old_diff_refs) { diff_refs(create_file_commit, update_file_again_commit) }
+        let(:new_diff_refs) { diff_refs(create_file_commit, update_file_commit) }
+        let(:change_diff_refs) { diff_refs(update_file_again_commit, update_file_commit) }
+
+        # old diff:
+        # 1 1   A
+        # 2   - B
+        #   2 + BB
+        # 3 3   C
+        # 4 4   D
+        # 5 5   E
+        # 6   - F
+        #   6 + FF
+        #   7 + G
+        #
+        # new diff:
+        # 1 1   A
+        # 2   - B
+        # 3 2   C
+        # 4   - D
+        #   3 + DD
+        # 5 4   E
+        # 6 5   F
+        #   6 + G
+
+        it "returns the new positions" do
+          old_position_attrs = [
+            { old_path: file_name, new_path: file_name, old_line: 1, new_line: 1 }, #   A
+            { old_path: file_name,                      old_line: 2              }, # - B
+            {                      new_path: file_name,              new_line: 2 }, # + BB
+            { old_path: file_name, new_path: file_name, old_line: 3, new_line: 3 }, #   C
+            { old_path: file_name, new_path: file_name, old_line: 4, new_line: 4 }, #   D
+            { old_path: file_name, new_path: file_name, old_line: 5, new_line: 5 }, #   E
+            { old_path: file_name,                      old_line: 6              }, # - F
+            {                      new_path: file_name,              new_line: 6 }, # + FF
+            {                      new_path: file_name,              new_line: 7 } # + G
+          ]
+
+          new_position_attrs = [
+            { old_path: file_name, new_path: file_name, old_line: 1, new_line: 1 },
+            { old_path: file_name,                      old_line: 2              },
+            { old_path: file_name,                      old_line: 2, change: true },
+            { old_path: file_name, new_path: file_name, old_line: 3, new_line: 2 },
+            { old_path: file_name,                      old_line: 4, change: true },
+            { old_path: file_name, new_path: file_name, old_line: 5, new_line: 4 },
+            {                      new_path: file_name,              new_line: 5, change: true },
+            { old_path: file_name, old_line: 6, change: true },
+            { new_path: file_name, new_line: 6 }
+          ]
+
+          expect_new_positions(old_position_attrs, new_position_attrs)
+        end
+      end
+
+      describe "rebase on top of target branch" do
+        let(:second_update_file_commit) do
+          update_file_commit
+
+          update_file(
+            second_branch_name,
+            file_name,
+            <<-CONTENT.strip_heredoc
+              Z
+              Z
+              Z
+              A
+              C
+              DD
+              E
+              F
+              G
+            CONTENT
+          )
+        end
+
+        let(:update_file_again_commit) do
+          second_update_file_commit
+
+          update_file(
+            branch_name,
+            file_name,
+            <<-CONTENT.strip_heredoc
+              A
+              BB
+              C
+              D
+              E
+              FF
+              G
+            CONTENT
+          )
+        end
+
+        let(:overwrite_update_file_again_commit) do
+          update_file_again_commit
+
+          update_file(
+            second_branch_name,
+            file_name,
+            <<-CONTENT.strip_heredoc
+              Z
+              Z
+              Z
+              A
+              BB
+              C
+              D
+              E
+              FF
+              G
+            CONTENT
+          )
+        end
+
+        let(:old_diff_refs) { diff_refs(create_file_commit, update_file_again_commit) }
+        let(:new_diff_refs) { diff_refs(create_file_commit, overwrite_update_file_again_commit) }
+        let(:change_diff_refs) { diff_refs(update_file_again_commit, overwrite_update_file_again_commit) }
+
+        # old diff:
+        # 1 1   A
+        # 2   - B
+        #   2 + BB
+        # 3 3   C
+        # 4 4   D
+        # 5 5   E
+        # 6   - F
+        #   6 + FF
+        #   7 + G
+        #
+        # new diff:
+        #   1 + Z
+        #   2 + Z
+        #   3 + Z
+        # 1 4   A
+        # 2   - B
+        #   5 + BB
+        # 3 6   C
+        # 4 7   D
+        # 5 8   E
+        # 6   - F
+        #   9 + FF
+        #   0 + G
+
+        it "returns the new positions" do
+          old_position_attrs = [
+            { old_path: file_name, new_path: file_name, old_line: 1, new_line: 1 }, #   A
+            { old_path: file_name,                      old_line: 2              }, # - B
+            {                      new_path: file_name,              new_line: 2 }, # + BB
+            { old_path: file_name, new_path: file_name, old_line: 3, new_line: 3 }, #   C
+            { old_path: file_name, new_path: file_name, old_line: 4, new_line: 4 }, #   D
+            { old_path: file_name, new_path: file_name, old_line: 5, new_line: 5 }, #   E
+            { old_path: file_name,                      old_line: 6              }, # - F
+            {                      new_path: file_name,              new_line: 6 }, # + FF
+            {                      new_path: file_name,              new_line: 7 } # + G
+          ]
+
+          new_position_attrs = [
+            { old_path: file_name, new_path: file_name, old_line: 1, new_line: 4 }, #   A
+            { old_path: file_name,                      old_line: 2              }, # - B
+            {                      new_path: file_name,              new_line: 5 }, # + BB
+            { old_path: file_name, new_path: file_name, old_line: 3, new_line: 6 }, #   C
+            { old_path: file_name, new_path: file_name, old_line: 4, new_line: 7 }, #   D
+            { old_path: file_name, new_path: file_name, old_line: 5, new_line: 8 }, #   E
+            { old_path: file_name,                      old_line: 6              }, # - F
+            {                      new_path: file_name,              new_line: 9 }, # + FF
+            {                      new_path: file_name,              new_line: 10 } # + G
+          ]
+
+          expect_new_positions(old_position_attrs, new_position_attrs)
+        end
+      end
+
+      describe "merge of target branch" do
+        let(:merge_commit) do
+          second_create_file_commit
+
+          merge_request = create(:merge_request, source_branch: second_branch_name, target_branch: branch_name, source_project: project)
+
+          repository.merge(current_user, merge_request.diff_head_sha, merge_request, "Merge branches")
+
+          project.commit(branch_name)
+        end
+
+        let(:old_diff_refs) { diff_refs(create_file_commit, update_file_again_commit) }
+        let(:new_diff_refs) { diff_refs(create_file_commit, merge_commit) }
+        let(:change_diff_refs) { diff_refs(update_file_again_commit, merge_commit) }
+
+        # old diff:
+        # 1 1   A
+        # 2   - B
+        #   2 + BB
+        # 3 3   C
+        # 4 4   D
+        # 5 5   E
+        # 6   - F
+        #   6 + FF
+        #   7 + G
+        #
+        # new diff:
+        #   1 + Z
+        #   2 + Z
+        #   3 + Z
+        # 1 4   A
+        # 2   - B
+        #   5 + BB
+        # 3 6   C
+        # 4 7   D
+        # 5 8   E
+        # 6   - F
+        #   9 + FF
+        #   0 + G
+
+        it "returns the new positions" do
+          old_position_attrs = [
+            { old_path: file_name, new_path: file_name, old_line: 1, new_line: 1 }, #   A
+            { old_path: file_name,                      old_line: 2              }, # - B
+            {                      new_path: file_name,              new_line: 2 }, # + BB
+            { old_path: file_name, new_path: file_name, old_line: 3, new_line: 3 }, #   C
+            { old_path: file_name, new_path: file_name, old_line: 4, new_line: 4 }, #   D
+            { old_path: file_name, new_path: file_name, old_line: 5, new_line: 5 }, #   E
+            { old_path: file_name,                      old_line: 6              }, # - F
+            {                      new_path: file_name,              new_line: 6 }, # + FF
+            {                      new_path: file_name,              new_line: 7 } # + G
+          ]
+
+          new_position_attrs = [
+            { old_path: file_name, new_path: file_name, old_line: 1, new_line: 4 }, #   A
+            { old_path: file_name,                      old_line: 2              }, # - B
+            {                      new_path: file_name,              new_line: 5 }, # + BB
+            { old_path: file_name, new_path: file_name, old_line: 3, new_line: 6 }, #   C
+            { old_path: file_name, new_path: file_name, old_line: 4, new_line: 7 }, #   D
+            { old_path: file_name, new_path: file_name, old_line: 5, new_line: 8 }, #   E
+            { old_path: file_name,                      old_line: 6              }, # - F
+            {                      new_path: file_name,              new_line: 9 }, # + FF
+            {                      new_path: file_name,              new_line: 10 } # + G
+          ]
+
+          expect_new_positions(old_position_attrs, new_position_attrs)
+        end
+      end
+
+      describe "changing target branch" do
+        let(:old_diff_refs) { diff_refs(create_file_commit, update_file_again_commit) }
+        let(:new_diff_refs) { diff_refs(update_file_commit, update_file_again_commit) }
+        let(:change_diff_refs) { diff_refs(create_file_commit, update_file_commit) }
+
+        # old diff:
+        # 1 1   A
+        # 2   - B
+        #   2 + BB
+        # 3 3   C
+        # 4 4   D
+        # 5 5   E
+        # 6   - F
+        #   6 + FF
+        #   7 + G
+        #
+        # new diff:
+        # 1 1   A
+        #   2 + BB
+        # 2 3   C
+        # 3   - DD
+        #   4 + D
+        # 4 5   E
+        # 5   - F
+        #   6 + FF
+        #   7   G
+
+        it "returns the new positions" do
+          old_position_attrs = [
+            { old_path: file_name, new_path: file_name, old_line: 1, new_line: 1 }, #   A
+            { old_path: file_name,                      old_line: 2              }, # - B
+            {                      new_path: file_name,              new_line: 2 }, # + BB
+            { old_path: file_name, new_path: file_name, old_line: 3, new_line: 3 }, #   C
+            { old_path: file_name, new_path: file_name, old_line: 4, new_line: 4 }, #   D
+            { old_path: file_name, new_path: file_name, old_line: 5, new_line: 5 }, #   E
+            { old_path: file_name,                      old_line: 6              }, # - F
+            {                      new_path: file_name,              new_line: 6 }, # + FF
+            {                      new_path: file_name,              new_line: 7 } # + G
+          ]
+
+          new_position_attrs = [
+            { old_path: file_name, new_path: file_name, old_line: 1, new_line: 1 },
+            { old_path: file_name,                      old_line: 2, change: true },
+            {                      new_path: file_name,              new_line: 2 },
+            { old_path: file_name, new_path: file_name, old_line: 2, new_line: 3 },
+            {                      new_path: file_name,              new_line: 4 },
+            { old_path: file_name, new_path: file_name, old_line: 4, new_line: 5 },
+            { old_path: file_name,                      old_line: 5              },
+            {                      new_path: file_name,              new_line: 6 },
+            {                      new_path: file_name,              new_line: 7 }
+          ]
+
+          expect_new_positions(old_position_attrs, new_position_attrs)
+        end
+      end
+    end
+  end
+end
diff --git a/spec/lib/gitlab/diff/position_tracer_spec.rb b/spec/lib/gitlab/diff/position_tracer_spec.rb
index 866550753a8..79b33d4d276 100644
--- a/spec/lib/gitlab/diff/position_tracer_spec.rb
+++ b/spec/lib/gitlab/diff/position_tracer_spec.rb
@@ -1,1896 +1,98 @@
 require 'spec_helper'
 
 describe Gitlab::Diff::PositionTracer do
-  # Douwe's diary                                    New York City, 2016-06-28
-  # --------------------------------------------------------------------------
-  #
-  # Dear diary,
-  #
-  # Ideally, we would have a test for every single diff scenario that can
-  # occur and that the PositionTracer should correctly trace a position
-  # through, across the following variables:
-  #
-  # - Old diff file type: created, changed, renamed, deleted, unchanged (5)
-  # - Old diff line type: added, removed, unchanged (3)
-  # - New diff file type: created, changed, renamed, deleted, unchanged (5)
-  # - New diff line type: added, removed, unchanged (3)
-  # - Old-to-new diff line change: kept, moved, undone (3)
-  #
-  # This adds up to 5 * 3 * 5 * 3 * 3 = 675 different potential scenarios,
-  # and 675 different tests to cover them all. In reality, it would be fewer,
-  # since one cannot have a removed line in a created file diff, for example,
-  # but for the sake of this diary entry, let's be pessimistic.
-  #
-  # Writing these tests is a manual and time consuming process, as every test
-  # requires the manual construction or finding of a combination of diffs that
-  # create the exact diff scenario we are looking for, and can take between
-  # 1 and 10 minutes, depending on the farfetchedness of the scenario and
-  # complexity of creating it.
-  #
-  # This means that writing tests to cover all of these scenarios would end up
-  # taking between 11 and 112 hours in total, which I do not believe is the
-  # best use of my time.
-  #
-  # A better course of action would be to think of scenarios that are likely
-  # to occur, but also potentially tricky to trace correctly, and only cover
-  # those, with a few more obvious scenarios thrown in to cover our bases.
-  #
-  # Unfortunately, I only came to the above realization once I was about
-  # 1/5th of the way through the process of writing ALL THE SPECS, having
-  # already wasted about 3 hours trying to be thorough.
-  #
-  # I did find 2 bugs while writing those though, so that's good.
-  #
-  # In any case, all of this means that the tests below will be extremely
-  # (excessively, unjustifiably) thorough for scenarios where "the file was
-  # created in the old diff" and then drop off to comparatively lackluster
-  # testing of other scenarios.
-  #
-  # I did still try to cover most of the obvious and potentially tricky
-  # scenarios, though.
+  include PositionTracerHelpers
 
-  include RepoHelpers
-
-  let(:project) { create(:project, :repository) }
-  let(:current_user) { project.owner }
-  let(:repository) { project.repository }
-  let(:file_name) { "test-file" }
-  let(:new_file_name) { "#{file_name}-new" }
-  let(:second_file_name) { "#{file_name}-2" }
-  let(:branch_name) { "position-tracer-test" }
-
-  let(:old_diff_refs) { raise NotImplementedError }
-  let(:new_diff_refs) { raise NotImplementedError }
-  let(:change_diff_refs) { raise NotImplementedError }
-  let(:old_position) { raise NotImplementedError }
-
-  let(:position_tracer) { described_class.new(project: project, old_diff_refs: old_diff_refs, new_diff_refs: new_diff_refs) }
-  subject { position_tracer.trace(old_position) }
-
-  def diff_refs(base_commit, head_commit)
-    Gitlab::Diff::DiffRefs.new(base_sha: base_commit.id, head_sha: head_commit.id)
-  end
-
-  def text_position_attrs
-    [:old_line, :new_line]
-  end
-
-  def position(attrs = {})
-    attrs.reverse_merge!(
-      diff_refs: old_diff_refs
+  subject do
+    described_class.new(
+      project: project,
+      old_diff_refs: old_diff_refs,
+      new_diff_refs: new_diff_refs
     )
-    Gitlab::Diff::Position.new(attrs)
   end
 
-  def expect_new_position(attrs, result = subject)
-    aggregate_failures("expect new position #{attrs.inspect}") do
-      if attrs.nil?
-        expect(result[:outdated]).to be_truthy
-      else
-        expect(result[:outdated]).to be_falsey
+  describe '#trace' do
+    let(:diff_refs) { double(complete?: true) }
+    let(:project) { double }
+    let(:old_diff_refs) { diff_refs }
+    let(:new_diff_refs) { diff_refs }
+    let(:position) { double(on_text?: on_text?, diff_refs: diff_refs) }
+    let(:tracer) { double }
 
-        new_position = result[:position]
-        expect(new_position).not_to be_nil
+    context 'position is on text' do
+      let(:on_text?) { true }
 
-        expect(new_position.diff_refs).to eq(new_diff_refs)
+      it 'calls LineStrategy#trace' do
+        expect(Gitlab::Diff::PositionTracer::LineStrategy)
+          .to receive(:new)
+          .with(subject)
+          .and_return(tracer)
+        expect(tracer).to receive(:trace).with(position)
 
-        attrs.each do |attr, value|
-          if text_position_attrs.include?(attr)
-            expect(new_position.formatter.send(attr)).to eq(value)
-          else
-            expect(new_position.send(attr)).to eq(value)
-          end
-        end
+        subject.trace(position)
       end
     end
-  end
-
-  def expect_change_position(attrs, result = subject)
-    aggregate_failures("expect change position #{attrs.inspect}") do
-      expect(result[:outdated]).to be_truthy
-
-      change_position = result[:position]
-      if attrs.nil? || attrs.empty?
-        expect(change_position).to be_nil
-      else
-        expect(change_position).not_to be_nil
-
-        expect(change_position.diff_refs).to eq(change_diff_refs)
-
-        attrs.each do |attr, value|
-          if text_position_attrs.include?(attr)
-            expect(change_position.formatter.send(attr)).to eq(value)
-          else
-            expect(change_position.send(attr)).to eq(value)
-          end
-        end
-      end
-    end
-  end
-
-  def create_branch(new_name, branch_name)
-    CreateBranchService.new(project, current_user).execute(new_name, branch_name)
-  end
-
-  def create_file(branch_name, file_name, content)
-    Files::CreateService.new(
-      project,
-      current_user,
-      start_branch: branch_name,
-      branch_name: branch_name,
-      commit_message: "Create file",
-      file_path: file_name,
-      file_content: content
-    ).execute
-    project.commit(branch_name)
-  end
-
-  def update_file(branch_name, file_name, content)
-    Files::UpdateService.new(
-      project,
-      current_user,
-      start_branch: branch_name,
-      branch_name: branch_name,
-      commit_message: "Update file",
-      file_path: file_name,
-      file_content: content
-    ).execute
-    project.commit(branch_name)
-  end
-
-  def delete_file(branch_name, file_name)
-    Files::DeleteService.new(
-      project,
-      current_user,
-      start_branch: branch_name,
-      branch_name: branch_name,
-      commit_message: "Delete file",
-      file_path: file_name
-    ).execute
-    project.commit(branch_name)
-  end
-
-  let(:initial_commit) do
-    create_branch(branch_name, "master")[:branch].name
-    project.commit(branch_name)
-  end
-
-  describe "#trace" do
-    describe "diff scenarios" do
-      let(:create_file_commit) do
-        initial_commit
-
-        create_file(
-          branch_name,
-          file_name,
-          <<-CONTENT.strip_heredoc
-            A
-            B
-            C
-          CONTENT
-        )
-      end
-
-      let(:create_second_file_commit) do
-        create_file_commit
-
-        create_file(
-          branch_name,
-          second_file_name,
-          <<-CONTENT.strip_heredoc
-            D
-            E
-          CONTENT
-        )
-      end
-
-      let(:update_line_commit) do
-        create_second_file_commit
-
-        update_file(
-          branch_name,
-          file_name,
-          <<-CONTENT.strip_heredoc
-            A
-            BB
-            C
-          CONTENT
-        )
-      end
-
-      let(:update_second_file_line_commit) do
-        update_line_commit
-
-        update_file(
-          branch_name,
-          second_file_name,
-          <<-CONTENT.strip_heredoc
-            D
-            EE
-          CONTENT
-        )
-      end
-
-      let(:move_line_commit) do
-        update_second_file_line_commit
-
-        update_file(
-          branch_name,
-          file_name,
-          <<-CONTENT.strip_heredoc
-            BB
-            A
-            C
-          CONTENT
-        )
-      end
-
-      let(:add_second_file_line_commit) do
-        move_line_commit
-
-        update_file(
-          branch_name,
-          second_file_name,
-          <<-CONTENT.strip_heredoc
-            D
-            EE
-            F
-          CONTENT
-        )
-      end
-
-      let(:move_second_file_line_commit) do
-        add_second_file_line_commit
-
-        update_file(
-          branch_name,
-          second_file_name,
-          <<-CONTENT.strip_heredoc
-            D
-            F
-            EE
-          CONTENT
-        )
-      end
-
-      let(:delete_line_commit) do
-        move_second_file_line_commit
-
-        update_file(
-          branch_name,
-          file_name,
-          <<-CONTENT.strip_heredoc
-            BB
-            A
-          CONTENT
-        )
-      end
-
-      let(:delete_second_file_line_commit) do
-        delete_line_commit
-
-        update_file(
-          branch_name,
-          second_file_name,
-          <<-CONTENT.strip_heredoc
-            D
-            F
-          CONTENT
-        )
-      end
-
-      let(:delete_file_commit) do
-        delete_second_file_line_commit
-
-        delete_file(branch_name, file_name)
-      end
-
-      let(:rename_file_commit) do
-        delete_file_commit
-
-        create_file(
-          branch_name,
-          new_file_name,
-          <<-CONTENT.strip_heredoc
-            BB
-            A
-          CONTENT
-        )
-      end
-
-      let(:update_line_again_commit) do
-        rename_file_commit
-
-        update_file(
-          branch_name,
-          new_file_name,
-          <<-CONTENT.strip_heredoc
-            BB
-            AA
-          CONTENT
-        )
-      end
-
-      let(:move_line_again_commit) do
-        update_line_again_commit
-
-        update_file(
-          branch_name,
-          new_file_name,
-          <<-CONTENT.strip_heredoc
-            AA
-            BB
-          CONTENT
-        )
-      end
-
-      let(:delete_line_again_commit) do
-        move_line_again_commit
-
-        update_file(
-          branch_name,
-          new_file_name,
-          <<-CONTENT.strip_heredoc
-            AA
-          CONTENT
-        )
-      end
-
-      context "when the file was created in the old diff" do
-        context "when the file is created in the new diff" do
-          context "when the position pointed at an added line in the old diff" do
-            context "when the file's content was unchanged between the old and the new diff" do
-              let(:old_diff_refs) { diff_refs(initial_commit, create_file_commit) }
-              let(:new_diff_refs) { diff_refs(initial_commit, create_second_file_commit) }
-              let(:old_position) { position(new_path: file_name, new_line: 2) }
-
-              # old diff:
-              #   1 + A
-              #   2 + B
-              #   3 + C
-              #
-              # new diff:
-              #   1 + A
-              #   2 + B
-              #   3 + C
-
-              it "returns the new position" do
-                expect_new_position(
-                  new_path: old_position.new_path,
-                  new_line: old_position.new_line
-                )
-              end
-            end
-
-            context "when the file's content was changed between the old and the new diff" do
-              context "when that line was unchanged between the old and the new diff" do
-                let(:old_diff_refs) { diff_refs(initial_commit, create_file_commit) }
-                let(:new_diff_refs) { diff_refs(initial_commit, update_line_commit) }
-                let(:old_position) { position(new_path: file_name, new_line: 1) }
-
-                # old diff:
-                #   1 + A
-                #   2 + B
-                #   3 + C
-                #
-                # new diff:
-                #   1 + A
-                #   2 + BB
-                #   3 + C
-
-                it "returns the new position" do
-                  expect_new_position(
-                    new_path: old_position.new_path,
-                    new_line: old_position.new_line
-                  )
-                end
-              end
-
-              context "when that line was moved between the old and the new diff" do
-                let(:old_diff_refs) { diff_refs(initial_commit, update_line_commit) }
-                let(:new_diff_refs) { diff_refs(initial_commit, move_line_commit) }
-                let(:old_position) { position(new_path: file_name, new_line: 2) }
-
-                # old diff:
-                #   1 + A
-                #   2 + BB
-                #   3 + C
-                #
-                # new diff:
-                #   1 + BB
-                #   2 + A
-                #   3 + C
-
-                it "returns the new position" do
-                  expect_new_position(
-                    new_path: old_position.new_path,
-                    new_line: 1
-                  )
-                end
-              end
-
-              context "when that line was changed between the old and the new diff" do
-                let(:old_diff_refs) { diff_refs(initial_commit, create_file_commit) }
-                let(:new_diff_refs) { diff_refs(initial_commit, update_line_commit) }
-                let(:change_diff_refs) { diff_refs(create_file_commit, update_line_commit) }
-                let(:old_position) { position(new_path: file_name, new_line: 2) }
-
-                # old diff:
-                #   1 + A
-                #   2 + B
-                #   3 + C
-                #
-                # new diff:
-                #   1 + A
-                #   2 + BB
-                #   3 + C
-
-                it "returns the position of the change" do
-                  expect_change_position(
-                    old_path: file_name,
-                    new_path: file_name,
-                    old_line: 2,
-                    new_line: nil
-                  )
-                end
-              end
-
-              context "when that line was deleted between the old and the new diff" do
-                let(:old_diff_refs) { diff_refs(initial_commit, update_line_commit) }
-                let(:new_diff_refs) { diff_refs(initial_commit, delete_line_commit) }
-                let(:change_diff_refs) { diff_refs(update_line_commit, delete_line_commit) }
-                let(:old_position) { position(new_path: file_name, new_line: 3) }
-
-                # old diff:
-                #   1 + A
-                #   2 + BB
-                #   3 + C
-                #
-                # new diff:
-                #   1 + A
-                #   2 + BB
-
-                it "returns the position of the change" do
-                  expect_change_position(
-                    old_path: file_name,
-                    new_path: file_name,
-                    old_line: 3,
-                    new_line: nil
-                  )
-                end
-              end
-            end
-          end
-        end
-
-        context "when the file is changed in the new diff" do
-          context "when the position pointed at an added line in the old diff" do
-            context "when the file's content was unchanged between the old and the new diff" do
-              let(:old_diff_refs) { diff_refs(initial_commit, update_line_commit) }
-              let(:new_diff_refs) { diff_refs(create_file_commit, update_line_commit) }
-              let(:old_position) { position(new_path: file_name, new_line: 1) }
-
-              # old diff:
-              #   1 + A
-              #   2 + BB
-              #   3 + C
-              #
-              # new diff:
-              # 1 1   A
-              # 2   - B
-              #   2 + BB
-              # 3 3   C
-
-              it "returns the new position" do
-                expect_new_position(
-                  new_path: old_position.new_path,
-                  new_line: old_position.new_line
-                )
-              end
-            end
-
-            context "when the file's content was changed between the old and the new diff" do
-              context "when that line was unchanged between the old and the new diff" do
-                let(:old_diff_refs) { diff_refs(initial_commit, update_line_commit) }
-                let(:new_diff_refs) { diff_refs(update_line_commit, move_line_commit) }
-                let(:old_position) { position(new_path: file_name, new_line: 3) }
-
-                # old diff:
-                #   1 + A
-                #   2 + BB
-                #   3 + C
-                #
-                # new diff:
-                # 1   - A
-                # 2 1   BB
-                #   2 + A
-                # 3 3   C
-
-                it "returns the new position" do
-                  expect_new_position(
-                    new_path: old_position.new_path,
-                    new_line: old_position.new_line
-                  )
-                end
-              end
-
-              context "when that line was moved between the old and the new diff" do
-                let(:old_diff_refs) { diff_refs(initial_commit, update_line_commit) }
-                let(:new_diff_refs) { diff_refs(update_line_commit, move_line_commit) }
-                let(:old_position) { position(new_path: file_name, new_line: 2) }
-
-                # old diff:
-                #   1 + A
-                #   2 + BB
-                #   3 + C
-                #
-                # new diff:
-                # 1   - A
-                # 2 1   BB
-                #   2 + A
-                # 3 3   C
-
-                it "returns the new position" do
-                  expect_new_position(
-                    new_path: old_position.new_path,
-                    new_line: 1
-                  )
-                end
-              end
-
-              context "when that line was changed between the old and the new diff" do
-                let(:old_diff_refs) { diff_refs(initial_commit, create_file_commit) }
-                let(:new_diff_refs) { diff_refs(create_file_commit, update_line_commit) }
-                let(:change_diff_refs) { diff_refs(create_file_commit, update_line_commit) }
-                let(:old_position) { position(new_path: file_name, new_line: 2) }
-
-                # old diff:
-                #   1 + A
-                #   2 + B
-                #   3 + C
-                #
-                # new diff:
-                # 1 1   A
-                # 2   - B
-                #   2 + BB
-                # 3 3   C
-
-                it "returns the position of the change" do
-                  expect_change_position(
-                    old_path: file_name,
-                    new_path: file_name,
-                    old_line: 2,
-                    new_line: nil
-                  )
-                end
-              end
-
-              context "when that line was deleted between the old and the new diff" do
-                let(:old_diff_refs) { diff_refs(initial_commit, move_line_commit) }
-                let(:new_diff_refs) { diff_refs(move_line_commit, delete_line_commit) }
-                let(:change_diff_refs) { diff_refs(move_line_commit, delete_line_commit) }
-                let(:old_position) { position(new_path: file_name, new_line: 3) }
-
-                # old diff:
-                #   1 + BB
-                #   2 + A
-                #   3 + C
-                #
-                # new diff:
-                # 1 1   BB
-                # 2 2   A
-                # 3   - C
-
-                it "returns the position of the change" do
-                  expect_change_position(
-                    old_path: file_name,
-                    new_path: file_name,
-                    old_line: 3,
-                    new_line: nil
-                  )
-                end
-              end
-            end
-          end
-        end
-
-        context "when the file is renamed in the new diff" do
-          context "when the position pointed at an added line in the old diff" do
-            context "when the file's content was unchanged between the old and the new diff" do
-              let(:old_diff_refs) { diff_refs(initial_commit, delete_line_commit) }
-              let(:new_diff_refs) { diff_refs(delete_line_commit, rename_file_commit) }
-              let(:change_diff_refs) { diff_refs(initial_commit, delete_line_commit) }
-              let(:old_position) { position(new_path: file_name, new_line: 2) }
-
-              # old diff:
-              #   1 + BB
-              #   2 + A
-              #
-              # new diff:
-              # file_name -> new_file_name
-              # 1 1   BB
-              # 2 2   A
-
-              it "returns the position of the change" do
-                expect_change_position(
-                  old_path: file_name,
-                  new_path: file_name,
-                  old_line: nil,
-                  new_line: 2
-                )
-              end
-            end
-
-            context "when the file's content was changed between the old and the new diff" do
-              context "when that line was unchanged between the old and the new diff" do
-                let(:old_diff_refs) { diff_refs(initial_commit, delete_line_commit) }
-                let(:new_diff_refs) { diff_refs(delete_line_commit, update_line_again_commit) }
-                let(:old_position) { position(new_path: file_name, new_line: 1) }
-
-                # old diff:
-                #   1 + BB
-                #   2 + A
-                #
-                # new diff:
-                # file_name -> new_file_name
-                # 1 1   BB
-                # 2   - A
-                #   2 + AA
-
-                it "returns the new position" do
-                  expect_new_position(
-                    old_path: file_name,
-                    new_path: new_file_name,
-                    old_line: old_position.new_line,
-                    new_line: old_position.new_line
-                  )
-                end
-              end
-
-              context "when that line was moved between the old and the new diff" do
-                let(:old_diff_refs) { diff_refs(initial_commit, delete_line_commit) }
-                let(:new_diff_refs) { diff_refs(delete_line_commit, move_line_again_commit) }
-                let(:old_position) { position(new_path: file_name, new_line: 1) }
-
-                # old diff:
-                #   1 + BB
-                #   2 + A
-                #
-                # new diff:
-                # file_name -> new_file_name
-                #   1 + AA
-                # 1 2   BB
-                # 2   - A
-
-                it "returns the new position" do
-                  expect_new_position(
-                    old_path: file_name,
-                    new_path: new_file_name,
-                    old_line: 1,
-                    new_line: 2
-                  )
-                end
-              end
-
-              context "when that line was changed between the old and the new diff" do
-                let(:old_diff_refs) { diff_refs(initial_commit, delete_line_commit) }
-                let(:new_diff_refs) { diff_refs(delete_line_commit, update_line_again_commit) }
-                let(:change_diff_refs) { diff_refs(delete_line_commit, update_line_again_commit) }
-                let(:old_position) { position(new_path: file_name, new_line: 2) }
-
-                # old diff:
-                #   1 + BB
-                #   2 + A
-                #
-                # new diff:
-                # file_name -> new_file_name
-                # 1 1   BB
-                # 2   - A
-                #   2 + AA
-
-                it "returns the position of the change" do
-                  expect_change_position(
-                    old_path: file_name,
-                    new_path: new_file_name,
-                    old_line: 2,
-                    new_line: nil
-                  )
-                end
-              end
-            end
-          end
-        end
-
-        context "when the file is deleted in the new diff" do
-          context "when the position pointed at an added line in the old diff" do
-            context "when the file's content was unchanged between the old and the new diff" do
-              let(:old_diff_refs) { diff_refs(initial_commit, delete_line_commit) }
-              let(:new_diff_refs) { diff_refs(delete_line_commit, delete_file_commit) }
-              let(:change_diff_refs) { diff_refs(delete_line_commit, delete_file_commit) }
-              let(:old_position) { position(new_path: file_name, new_line: 2) }
-
-              # old diff:
-              #   1 + BB
-              #   2 + A
-              #
-              # new diff:
-              # 1   - BB
-              # 2   - A
-
-              it "returns the position of the change" do
-                expect_change_position(
-                  old_path: file_name,
-                  new_path: file_name,
-                  old_line: 2,
-                  new_line: nil
-                )
-              end
-            end
-
-            context "when the file's content was changed between the old and the new diff" do
-              context "when that line was unchanged between the old and the new diff" do
-                let(:old_diff_refs) { diff_refs(initial_commit, move_line_commit) }
-                let(:new_diff_refs) { diff_refs(delete_line_commit, delete_file_commit) }
-                let(:change_diff_refs) { diff_refs(move_line_commit, delete_file_commit) }
-                let(:old_position) { position(new_path: file_name, new_line: 2) }
-
-                # old diff:
-                #   1 + BB
-                #   2 + A
-                #   3 + C
-                #
-                # new diff:
-                # 1   - BB
-                # 2   - A
-
-                it "returns the position of the change" do
-                  expect_change_position(
-                    old_path: file_name,
-                    new_path: file_name,
-                    old_line: 2,
-                    new_line: nil
-                  )
-                end
-              end
-
-              context "when that line was moved between the old and the new diff" do
-                let(:old_diff_refs) { diff_refs(initial_commit, update_line_commit) }
-                let(:new_diff_refs) { diff_refs(move_line_commit, delete_file_commit) }
-                let(:change_diff_refs) { diff_refs(update_line_commit, delete_file_commit) }
-                let(:old_position) { position(new_path: file_name, new_line: 2) }
-
-                # old diff:
-                #   1 + A
-                #   2 + BB
-                #   3 + C
-                #
-                # new diff:
-                # 1   - BB
-                # 2   - A
-                # 3   - C
-
-                it "returns the position of the change" do
-                  expect_change_position(
-                    old_path: file_name,
-                    new_path: file_name,
-                    old_line: 2,
-                    new_line: nil
-                  )
-                end
-              end
-
-              context "when that line was changed between the old and the new diff" do
-                let(:old_diff_refs) { diff_refs(initial_commit, create_file_commit) }
-                let(:new_diff_refs) { diff_refs(update_line_commit, delete_file_commit) }
-                let(:change_diff_refs) { diff_refs(create_file_commit, delete_file_commit) }
-                let(:old_position) { position(new_path: file_name, new_line: 2) }
-
-                # old diff:
-                #   1 + A
-                #   2 + B
-                #   3 + C
-                #
-                # new diff:
-                # 1   - A
-                # 2   - BB
-                # 3   - C
-
-                it "returns the position of the change" do
-                  expect_change_position(
-                    old_path: file_name,
-                    new_path: file_name,
-                    old_line: 2,
-                    new_line: nil
-                  )
-                end
-              end
-
-              context "when that line was deleted between the old and the new diff" do
-                let(:old_diff_refs) { diff_refs(initial_commit, move_line_commit) }
-                let(:new_diff_refs) { diff_refs(delete_line_commit, delete_file_commit) }
-                let(:change_diff_refs) { diff_refs(move_line_commit, delete_file_commit) }
-                let(:old_position) { position(new_path: file_name, new_line: 3) }
 
-                # old diff:
-                #   1 + BB
-                #   2 + A
-                #   3 + C
-                #
-                # new diff:
-                # 1   - BB
-                # 2   - A
+    context 'position is not on text' do
+      let(:on_text?) { false }
 
-                it "returns the position of the change" do
-                  expect_change_position(
-                    old_path: file_name,
-                    new_path: file_name,
-                    old_line: 3,
-                    new_line: nil
-                  )
-                end
-              end
-            end
-          end
-        end
+      it 'calls ImageStrategy#trace' do
+        expect(Gitlab::Diff::PositionTracer::ImageStrategy)
+          .to receive(:new)
+          .with(subject)
+          .and_return(tracer)
+        expect(tracer).to receive(:trace).with(position)
 
-        context "when the file is unchanged in the new diff" do
-          context "when the position pointed at an added line in the old diff" do
-            context "when the file's content was unchanged between the old and the new diff" do
-              let(:old_diff_refs) { diff_refs(initial_commit, create_file_commit) }
-              let(:new_diff_refs) { diff_refs(create_file_commit, create_second_file_commit) }
-              let(:change_diff_refs) { diff_refs(initial_commit, create_file_commit) }
-              let(:old_position) { position(new_path: file_name, new_line: 2) }
-
-              # old diff:
-              #   1 + A
-              #   2 + B
-              #   3 + C
-              #
-              # new diff:
-              # 1 1   A
-              # 2 2   B
-              # 3 3   C
-
-              it "returns the position of the change" do
-                expect_change_position(
-                  old_path: file_name,
-                  new_path: file_name,
-                  old_line: nil,
-                  new_line: 2
-                )
-              end
-            end
-
-            context "when the file's content was changed between the old and the new diff" do
-              context "when that line was unchanged between the old and the new diff" do
-                let(:old_diff_refs) { diff_refs(initial_commit, create_file_commit) }
-                let(:new_diff_refs) { diff_refs(update_line_commit, update_second_file_line_commit) }
-                let(:change_diff_refs) { diff_refs(initial_commit, update_line_commit) }
-                let(:old_position) { position(new_path: file_name, new_line: 1) }
-
-                # old diff:
-                #   1 + A
-                #   2 + B
-                #   3 + C
-                #
-                # new diff:
-                # 1 1   A
-                # 2 2   BB
-                # 3 3   C
-
-                it "returns the position of the change" do
-                  expect_change_position(
-                    old_path: file_name,
-                    new_path: file_name,
-                    old_line: nil,
-                    new_line: 1
-                  )
-                end
-              end
-
-              context "when that line was moved between the old and the new diff" do
-                let(:old_diff_refs) { diff_refs(initial_commit, update_line_commit) }
-                let(:new_diff_refs) { diff_refs(move_line_commit, move_second_file_line_commit) }
-                let(:change_diff_refs) { diff_refs(initial_commit, move_line_commit) }
-                let(:old_position) { position(new_path: file_name, new_line: 2) }
-
-                # old diff:
-                #   1 + A
-                #   2 + BB
-                #   3 + C
-                #
-                # new diff:
-                # 1 1   BB
-                # 2 2   A
-                # 3 3   C
-
-                it "returns the position of the change" do
-                  expect_change_position(
-                    old_path: file_name,
-                    new_path: file_name,
-                    old_line: nil,
-                    new_line: 1
-                  )
-                end
-              end
-
-              context "when that line was changed between the old and the new diff" do
-                let(:old_diff_refs) { diff_refs(initial_commit, create_file_commit) }
-                let(:new_diff_refs) { diff_refs(update_line_commit, update_second_file_line_commit) }
-                let(:change_diff_refs) { diff_refs(create_file_commit, update_second_file_line_commit) }
-                let(:old_position) { position(new_path: file_name, new_line: 2) }
-
-                # old diff:
-                #   1 + A
-                #   2 + B
-                #   3 + C
-                #
-                # new diff:
-                # 1 1   A
-                # 2 2   BB
-                # 3 3   C
-
-                it "returns the position of the change" do
-                  expect_change_position(
-                    old_path: file_name,
-                    new_path: file_name,
-                    old_line: 2,
-                    new_line: nil
-                  )
-                end
-              end
-
-              context "when that line was deleted between the old and the new diff" do
-                let(:old_diff_refs) { diff_refs(initial_commit, move_line_commit) }
-                let(:new_diff_refs) { diff_refs(delete_line_commit, delete_second_file_line_commit) }
-                let(:change_diff_refs) { diff_refs(move_line_commit, delete_second_file_line_commit) }
-                let(:old_position) { position(new_path: file_name, new_line: 3) }
-
-                # old diff:
-                #   1 + BB
-                #   2 + A
-                #   3 + C
-                #
-                # new diff:
-                # 1 1   BB
-                # 2 2   A
-
-                it "returns the position of the change" do
-                  expect_change_position(
-                    old_path: file_name,
-                    new_path: file_name,
-                    old_line: 3,
-                    new_line: nil
-                  )
-                end
-              end
-            end
-          end
-        end
-      end
-
-      context "when the file was changed in the old diff" do
-        context "when the file is created in the new diff" do
-          context "when the position pointed at an added line in the old diff" do
-            context "when the file's content was unchanged between the old and the new diff" do
-              let(:old_diff_refs) { diff_refs(create_file_commit, update_line_commit) }
-              let(:new_diff_refs) { diff_refs(initial_commit, update_line_commit) }
-              let(:old_position) { position(old_path: file_name, new_path: file_name, new_line: 2) }
-
-              # old diff:
-              # 1 1   A
-              # 2   - B
-              #   2 + BB
-              # 3 3   C
-              #
-              # new diff:
-              #   1 + A
-              #   2 + BB
-              #   3 + C
-
-              it "returns the new position" do
-                expect_new_position(
-                  new_path: old_position.new_path,
-                  old_line: nil,
-                  new_line: old_position.new_line
-                )
-              end
-            end
-
-            context "when the file's content was changed between the old and the new diff" do
-              context "when that line was unchanged between the old and the new diff" do
-                let(:old_diff_refs) { diff_refs(create_file_commit, move_line_commit) }
-                let(:new_diff_refs) { diff_refs(initial_commit, move_line_commit) }
-                let(:old_position) { position(old_path: file_name, new_path: file_name, new_line: 1) }
-
-                # old diff:
-                #   1 + BB
-                # 1 2   A
-                # 2   - B
-                # 3 3   C
-                #
-                # new diff:
-                #   1 + BB
-                #   2 + A
-
-                it "returns the new position" do
-                  expect_new_position(
-                    new_path: old_position.new_path,
-                    old_line: nil,
-                    new_line: old_position.new_line
-                  )
-                end
-              end
-
-              context "when that line was moved between the old and the new diff" do
-                let(:old_diff_refs) { diff_refs(create_file_commit, update_line_commit) }
-                let(:new_diff_refs) { diff_refs(initial_commit, move_line_commit) }
-                let(:old_position) { position(old_path: file_name, new_path: file_name, new_line: 2) }
-
-                # old diff:
-                # 1 1   A
-                # 2   - B
-                #   2 + BB
-                # 3 3   C
-                #
-                # new diff:
-                #   1 + BB
-                #   2 + A
-                #   3 + C
-
-                it "returns the new position" do
-                  expect_new_position(
-                    new_path: old_position.new_path,
-                    old_line: nil,
-                    new_line: 1
-                  )
-                end
-              end
-
-              context "when that line was changed or deleted between the old and the new diff" do
-                let(:old_diff_refs) { diff_refs(create_file_commit, move_line_commit) }
-                let(:new_diff_refs) { diff_refs(initial_commit, create_file_commit) }
-                let(:change_diff_refs) { diff_refs(move_line_commit, create_file_commit) }
-                let(:old_position) { position(old_path: file_name, new_path: file_name, new_line: 1) }
-
-                # old diff:
-                #   1 + BB
-                # 1 2   A
-                # 2   - B
-                # 3 3   C
-                #
-                # new diff:
-                #   1 + A
-                #   2 + B
-                #   3 + C
-
-                it "returns the position of the change" do
-                  expect_change_position(
-                    old_path: file_name,
-                    new_path: file_name,
-                    old_line: 1,
-                    new_line: nil
-                  )
-                end
-              end
-            end
-          end
-
-          context "when the position pointed at a deleted line in the old diff" do
-            let(:old_diff_refs) { diff_refs(create_file_commit, update_line_commit) }
-            let(:new_diff_refs) { diff_refs(initial_commit, update_line_commit) }
-            let(:change_diff_refs) { diff_refs(create_file_commit, initial_commit) }
-            let(:old_position) { position(old_path: file_name, new_path: file_name, old_line: 2) }
-
-            # old diff:
-            # 1 1   A
-            # 2   - B
-            #   2 + BB
-            # 3 3   C
-            #
-            # new diff:
-            #   1 + A
-            #   2 + BB
-            #   3 + C
-
-            it "returns the position of the change" do
-              expect_change_position(
-                old_path: file_name,
-                new_path: file_name,
-                old_line: 2,
-                new_line: nil
-              )
-            end
-          end
-
-          context "when the position pointed at an unchanged line in the old diff" do
-            context "when the file's content was unchanged between the old and the new diff" do
-              let(:old_diff_refs) { diff_refs(create_file_commit, update_line_commit) }
-              let(:new_diff_refs) { diff_refs(initial_commit, update_line_commit) }
-              let(:old_position) { position(old_path: file_name, new_path: file_name, old_line: 1, new_line: 1) }
-
-              # old diff:
-              # 1 1   A
-              # 2   - B
-              #   2 + BB
-              # 3 3   C
-              #
-              # new diff:
-              #   1 + A
-              #   2 + BB
-              #   3 + C
-
-              it "returns the new position" do
-                expect_new_position(
-                  new_path: old_position.new_path,
-                  old_line: nil,
-                  new_line: old_position.new_line
-                )
-              end
-            end
-
-            context "when the file's content was changed between the old and the new diff" do
-              context "when that line was unchanged between the old and the new diff" do
-                let(:old_diff_refs) { diff_refs(create_file_commit, move_line_commit) }
-                let(:new_diff_refs) { diff_refs(initial_commit, move_line_commit) }
-                let(:old_position) { position(old_path: file_name, new_path: file_name, old_line: 1, new_line: 2) }
-
-                # old diff:
-                #   1 + BB
-                # 1 2   A
-                # 2   - B
-                # 3 3   C
-                #
-                # new diff:
-                #   1 + BB
-                #   2 + A
-
-                it "returns the new position" do
-                  expect_new_position(
-                    new_path: old_position.new_path,
-                    old_line: nil,
-                    new_line: old_position.new_line
-                  )
-                end
-              end
-
-              context "when that line was moved between the old and the new diff" do
-                let(:old_diff_refs) { diff_refs(move_line_commit, delete_line_commit) }
-                let(:new_diff_refs) { diff_refs(initial_commit, update_line_commit) }
-                let(:old_position) { position(old_path: file_name, new_path: file_name, old_line: 2, new_line: 2) }
-
-                # old diff:
-                # 1 1   BB
-                # 2 2   A
-                # 3   - C
-                #
-                # new diff:
-                #   1 + A
-                #   2 + BB
-                #   3 + C
-
-                it "returns the new position" do
-                  expect_new_position(
-                    new_path: old_position.new_path,
-                    old_line: nil,
-                    new_line: 1
-                  )
-                end
-              end
-
-              context "when that line was changed or deleted between the old and the new diff" do
-                let(:old_diff_refs) { diff_refs(create_file_commit, move_line_commit) }
-                let(:new_diff_refs) { diff_refs(initial_commit, delete_line_commit) }
-                let(:change_diff_refs) { diff_refs(move_line_commit, delete_line_commit) }
-                let(:old_position) { position(old_path: file_name, new_path: file_name, old_line: 3, new_line: 3) }
-
-                # old diff:
-                #   1 + BB
-                # 1 2   A
-                # 2   - B
-                # 3 3   C
-                #
-                # new diff:
-                #   1 + A
-                #   2 + B
-
-                it "returns the position of the change" do
-                  expect_change_position(
-                    old_path: file_name,
-                    new_path: file_name,
-                    old_line: 3,
-                    new_line: nil
-                  )
-                end
-              end
-            end
-          end
-        end
-
-        context "when the file is changed in the new diff" do
-          context "when the position pointed at an added line in the old diff" do
-            context "when the file's content was unchanged between the old and the new diff" do
-              let(:old_diff_refs) { diff_refs(create_file_commit, update_line_commit) }
-              let(:new_diff_refs) { diff_refs(create_file_commit, update_second_file_line_commit) }
-              let(:old_position) { position(old_path: file_name, new_path: file_name, new_line: 2) }
-
-              # old diff:
-              # 1 1   A
-              # 2   - B
-              #   2 + BB
-              # 3 3   C
-              #
-              # new diff:
-              # 1 1   A
-              # 2   - B
-              #   2 + BB
-              # 3 3   C
-
-              it "returns the new position" do
-                expect_new_position(
-                  old_path: old_position.old_path,
-                  new_path: old_position.new_path,
-                  old_line: nil,
-                  new_line: old_position.new_line
-                )
-              end
-            end
-
-            context "when the file's content was changed between the old and the new diff" do
-              context "when that line was unchanged between the old and the new diff" do
-                let(:old_diff_refs) { diff_refs(create_file_commit, move_line_commit) }
-                let(:new_diff_refs) { diff_refs(move_line_commit, delete_line_commit) }
-                let(:old_position) { position(old_path: file_name, new_path: file_name, new_line: 1) }
-
-                # old diff:
-                #   1 + BB
-                # 1 2   A
-                # 2   - B
-                # 3 3   C
-                #
-                # new diff:
-                # 1 1   BB
-                # 2 2   A
-                # 3   - C
-
-                it "returns the new position" do
-                  expect_new_position(
-                    old_path: old_position.old_path,
-                    new_path: old_position.new_path,
-                    old_line: 1,
-                    new_line: 1
-                  )
-                end
-              end
-
-              context "when that line was moved between the old and the new diff" do
-                let(:old_diff_refs) { diff_refs(create_file_commit, update_line_commit) }
-                let(:new_diff_refs) { diff_refs(update_line_commit, move_line_commit) }
-                let(:old_position) { position(old_path: file_name, new_path: file_name, new_line: 2) }
-
-                # old diff:
-                # 1 1   A
-                # 2   - B
-                #   2 + BB
-                # 3 3   C
-                #
-                # new diff:
-                # 1   - A
-                # 2 1   BB
-                #   2 + A
-                # 3 3   C
-
-                it "returns the new position" do
-                  expect_new_position(
-                    old_path: old_position.old_path,
-                    new_path: old_position.new_path,
-                    old_line: 2,
-                    new_line: 1
-                  )
-                end
-              end
-
-              context "when that line was changed or deleted between the old and the new diff" do
-                let(:old_diff_refs) { diff_refs(create_file_commit, move_line_commit) }
-                let(:new_diff_refs) { diff_refs(create_file_commit, update_line_commit) }
-                let(:change_diff_refs) { diff_refs(move_line_commit, update_line_commit) }
-                let(:old_position) { position(old_path: file_name, new_path: file_name, new_line: 1) }
-
-                # old diff:
-                #   1 + BB
-                # 1 2   A
-                # 2   - B
-                # 3 3   C
-                #
-                # new diff:
-                # 1 1   A
-                # 2   - B
-                #   2 + BB
-                # 3 3   C
-
-                it "returns the position of the change" do
-                  expect_change_position(
-                    old_path: file_name,
-                    new_path: file_name,
-                    old_line: 1,
-                    new_line: nil
-                  )
-                end
-              end
-            end
-          end
-
-          context "when the position pointed at a deleted line in the old diff" do
-            context "when the file's content was unchanged between the old and the new diff" do
-              let(:old_diff_refs) { diff_refs(create_file_commit, update_line_commit) }
-              let(:new_diff_refs) { diff_refs(create_file_commit, update_second_file_line_commit) }
-              let(:old_position) { position(old_path: file_name, new_path: file_name, old_line: 2) }
-
-              # old diff:
-              # 1 1   A
-              # 2   - B
-              #   2 + BB
-              # 3 3   C
-              #
-              # new diff:
-              # 1 1   A
-              # 2   - B
-              #   2 + BB
-              # 3 3   C
-
-              it "returns the new position" do
-                expect_new_position(
-                  old_path: old_position.old_path,
-                  new_path: old_position.new_path,
-                  old_line: old_position.old_line,
-                  new_line: nil
-                )
-              end
-            end
-          end
-        end
+        subject.trace(position)
       end
     end
   end
 
-  describe "typical use scenarios" do
-    let(:second_branch_name) { "#{branch_name}-2" }
-
-    def expect_new_positions(old_attrs, new_attrs)
-      old_positions = old_attrs.map do |old_attrs|
-        position(old_attrs)
-      end
+  describe 'diffs methods' do
+    let(:project) { create(:project, :repository) }
+    let(:current_user) { project.owner }
 
-      new_positions = old_positions.map do |old_position|
-        position_tracer.trace(old_position)
-      end
-
-      aggregate_failures do
-        new_positions.zip(new_attrs).each do |new_position, new_attrs|
-          if new_attrs&.delete(:change)
-            expect_change_position(new_attrs, new_position)
-          else
-            expect_new_position(new_attrs, new_position)
-          end
-        end
-      end
-    end
-
-    let(:create_file_commit) do
-      initial_commit
-
-      create_file(
-        branch_name,
-        file_name,
-        <<-CONTENT.strip_heredoc
-          A
-          B
-          C
-          D
-          E
-          F
-        CONTENT
-      )
-    end
-
-    let(:second_create_file_commit) do
-      create_file_commit
-
-      create_branch(second_branch_name, branch_name)
-
-      update_file(
-        second_branch_name,
-        file_name,
-        <<-CONTENT.strip_heredoc
-          Z
-          Z
-          Z
-          A
-          B
-          C
-          D
-          E
-          F
-        CONTENT
+    let(:old_diff_refs) do
+      diff_refs(
+        project.commit(create_branch('new-branch', 'master')[:branch].name),
+        create_file('new-branch', 'file.md', 'content')
       )
     end
 
-    let(:update_file_commit) do
-      second_create_file_commit
-
-      update_file(
-        branch_name,
-        file_name,
-        <<-CONTENT.strip_heredoc
-          A
-          C
-          DD
-          E
-          F
-          G
-        CONTENT
-      )
-    end
-
-    let(:update_file_again_commit) do
-      update_file_commit
-
-      update_file(
-        branch_name,
-        file_name,
-        <<-CONTENT.strip_heredoc
-          A
-          BB
-          C
-          D
-          E
-          FF
-          G
-        CONTENT
+    let(:new_diff_refs) do
+      diff_refs(
+        create_file('new-branch', 'file.md', 'content'),
+        update_file('new-branch', 'file.md', 'updatedcontent')
       )
     end
 
-    describe "simple push of new commit" do
-      let(:old_diff_refs) { diff_refs(create_file_commit, update_file_commit) }
-      let(:new_diff_refs) { diff_refs(create_file_commit, update_file_again_commit) }
-      let(:change_diff_refs) { diff_refs(update_file_commit, update_file_again_commit) }
-
-      # old diff:
-      # 1 1   A
-      # 2   - B
-      # 3 2   C
-      # 4   - D
-      #   3 + DD
-      # 5 4   E
-      # 6 5   F
-      #   6 + G
-      #
-      # new diff:
-      # 1 1   A
-      # 2   - B
-      #   2 + BB
-      # 3 3   C
-      # 4 4   D
-      # 5 5   E
-      # 6   - F
-      #   6 + FF
-      #   7 + G
-
-      it "returns the new positions" do
-        old_position_attrs = [
-          { old_path: file_name, new_path: file_name, old_line: 1, new_line: 1 }, #   A
-          { old_path: file_name,                      old_line: 2              }, # - B
-          { old_path: file_name, new_path: file_name, old_line: 3, new_line: 2 }, #   C
-          { old_path: file_name,                      old_line: 4              }, # - D
-          {                      new_path: file_name,              new_line: 3 }, # + DD
-          { old_path: file_name, new_path: file_name, old_line: 5, new_line: 4 }, #   E
-          { old_path: file_name, new_path: file_name, old_line: 6, new_line: 5 }, #   F
-          {                      new_path: file_name,              new_line: 6 }, # + G
-        ]
-
-        new_position_attrs = [
-          { old_path: file_name, new_path: file_name, old_line: 1, new_line: 1 },
-          { old_path: file_name,                      old_line: 2              },
-          { old_path: file_name, new_path: file_name, old_line: 3, new_line: 3 },
-          {                      new_path: file_name,              new_line: 4,   change: true },
-          {                      new_path: file_name, old_line: 3,                change: true },
-          { old_path: file_name, new_path: file_name, old_line: 5, new_line: 5 },
-          {                      new_path: file_name, old_line: 5, change: true },
-          {                      new_path: file_name, new_line: 7 }
-        ]
+    describe '#ac_diffs' do
+      it 'returns the diffs between the base of old and new diff' do
+        diff_refs = subject.ac_diffs.diff_refs
 
-        expect_new_positions(old_position_attrs, new_position_attrs)
+        expect(diff_refs.base_sha).to eq(old_diff_refs.base_sha)
+        expect(diff_refs.start_sha).to eq(old_diff_refs.base_sha)
+        expect(diff_refs.head_sha).to eq(new_diff_refs.base_sha)
       end
     end
 
-    describe "force push to overwrite last commit" do
-      let(:second_create_file_commit) do
-        create_file_commit
+    describe '#bd_diffs' do
+      it 'returns the diffs between the HEAD of old and new diff' do
+        diff_refs = subject.bd_diffs.diff_refs
 
-        create_branch(second_branch_name, branch_name)
-
-        update_file(
-          second_branch_name,
-          file_name,
-          <<-CONTENT.strip_heredoc
-            A
-            BB
-            C
-            D
-            E
-            FF
-            G
-          CONTENT
-        )
-      end
-
-      let(:old_diff_refs) { diff_refs(create_file_commit, update_file_commit) }
-      let(:new_diff_refs) { diff_refs(create_file_commit, second_create_file_commit) }
-      let(:change_diff_refs) { diff_refs(update_file_commit, second_create_file_commit) }
-
-      # old diff:
-      # 1 1   A
-      # 2   - B
-      # 3 2   C
-      # 4   - D
-      #   3 + DD
-      # 5 4   E
-      # 6 5   F
-      #   6 + G
-      #
-      # new diff:
-      # 1 1   A
-      # 2   - B
-      #   2 + BB
-      # 3 3   C
-      # 4 4   D
-      # 5 5   E
-      # 6   - F
-      #   6 + FF
-      #   7 + G
-
-      it "returns the new positions" do
-        old_position_attrs = [
-          { old_path: file_name, new_path: file_name, old_line: 1, new_line: 1 }, #   A
-          { old_path: file_name,                      old_line: 2              }, # - B
-          { old_path: file_name, new_path: file_name, old_line: 3, new_line: 2 }, #   C
-          { old_path: file_name,                      old_line: 4              }, # - D
-          {                      new_path: file_name,              new_line: 3 }, # + DD
-          { old_path: file_name, new_path: file_name, old_line: 5, new_line: 4 }, #   E
-          { old_path: file_name, new_path: file_name, old_line: 6, new_line: 5 }, #   F
-          {                      new_path: file_name,              new_line: 6 }, # + G
-        ]
-
-        new_position_attrs = [
-          { old_path: file_name, new_path: file_name, old_line: 1, new_line: 1 },
-          { old_path: file_name,                      old_line: 2              },
-          { old_path: file_name, new_path: file_name, old_line: 3, new_line: 3 },
-          {                      new_path: file_name,              new_line: 4,   change: true },
-          { old_path: file_name,                      old_line: 3,                change: true },
-          { old_path: file_name, new_path: file_name, old_line: 5, new_line: 5 },
-          { old_path: file_name,                      old_line: 5, change: true },
-          {                      new_path: file_name,              new_line: 7 }
-        ]
-
-        expect_new_positions(old_position_attrs, new_position_attrs)
+        expect(diff_refs.base_sha).to eq(old_diff_refs.head_sha)
+        expect(diff_refs.start_sha).to eq(old_diff_refs.head_sha)
+        expect(diff_refs.head_sha).to eq(new_diff_refs.head_sha)
       end
     end
 
-    describe "force push to delete last commit" do
-      let(:old_diff_refs) { diff_refs(create_file_commit, update_file_again_commit) }
-      let(:new_diff_refs) { diff_refs(create_file_commit, update_file_commit) }
-      let(:change_diff_refs) { diff_refs(update_file_again_commit, update_file_commit) }
-
-      # old diff:
-      # 1 1   A
-      # 2   - B
-      #   2 + BB
-      # 3 3   C
-      # 4 4   D
-      # 5 5   E
-      # 6   - F
-      #   6 + FF
-      #   7 + G
-      #
-      # new diff:
-      # 1 1   A
-      # 2   - B
-      # 3 2   C
-      # 4   - D
-      #   3 + DD
-      # 5 4   E
-      # 6 5   F
-      #   6 + G
-
-      it "returns the new positions" do
-        old_position_attrs = [
-          { old_path: file_name, new_path: file_name, old_line: 1, new_line: 1 }, #   A
-          { old_path: file_name,                      old_line: 2              }, # - B
-          {                      new_path: file_name,              new_line: 2 }, # + BB
-          { old_path: file_name, new_path: file_name, old_line: 3, new_line: 3 }, #   C
-          { old_path: file_name, new_path: file_name, old_line: 4, new_line: 4 }, #   D
-          { old_path: file_name, new_path: file_name, old_line: 5, new_line: 5 }, #   E
-          { old_path: file_name,                      old_line: 6              }, # - F
-          {                      new_path: file_name,              new_line: 6 }, # + FF
-          {                      new_path: file_name,              new_line: 7 }, # + G
-        ]
-
-        new_position_attrs = [
-          { old_path: file_name, new_path: file_name, old_line: 1, new_line: 1 },
-          { old_path: file_name,                      old_line: 2              },
-          { old_path: file_name,                      old_line: 2, change: true },
-          { old_path: file_name, new_path: file_name, old_line: 3, new_line: 2 },
-          { old_path: file_name,                      old_line: 4, change: true },
-          { old_path: file_name, new_path: file_name, old_line: 5, new_line: 4 },
-          {                      new_path: file_name,              new_line: 5, change: true },
-          { old_path: file_name, old_line: 6, change: true },
-          { new_path: file_name, new_line: 6 }
-        ]
-
-        expect_new_positions(old_position_attrs, new_position_attrs)
-      end
-    end
-
-    describe "rebase on top of target branch" do
-      let(:second_update_file_commit) do
-        update_file_commit
-
-        update_file(
-          second_branch_name,
-          file_name,
-          <<-CONTENT.strip_heredoc
-            Z
-            Z
-            Z
-            A
-            C
-            DD
-            E
-            F
-            G
-          CONTENT
-        )
-      end
-
-      let(:update_file_again_commit) do
-        second_update_file_commit
-
-        update_file(
-          branch_name,
-          file_name,
-          <<-CONTENT.strip_heredoc
-            A
-            BB
-            C
-            D
-            E
-            FF
-            G
-          CONTENT
-        )
-      end
-
-      let(:overwrite_update_file_again_commit) do
-        update_file_again_commit
-
-        update_file(
-          second_branch_name,
-          file_name,
-          <<-CONTENT.strip_heredoc
-            Z
-            Z
-            Z
-            A
-            BB
-            C
-            D
-            E
-            FF
-            G
-          CONTENT
-        )
-      end
-
-      let(:old_diff_refs) { diff_refs(create_file_commit, update_file_again_commit) }
-      let(:new_diff_refs) { diff_refs(create_file_commit, overwrite_update_file_again_commit) }
-      let(:change_diff_refs) { diff_refs(update_file_again_commit, overwrite_update_file_again_commit) }
-
-      # old diff:
-      # 1 1   A
-      # 2   - B
-      #   2 + BB
-      # 3 3   C
-      # 4 4   D
-      # 5 5   E
-      # 6   - F
-      #   6 + FF
-      #   7 + G
-      #
-      # new diff:
-      #   1 + Z
-      #   2 + Z
-      #   3 + Z
-      # 1 4   A
-      # 2   - B
-      #   5 + BB
-      # 3 6   C
-      # 4 7   D
-      # 5 8   E
-      # 6   - F
-      #   9 + FF
-      #   0 + G
-
-      it "returns the new positions" do
-        old_position_attrs = [
-          { old_path: file_name, new_path: file_name, old_line: 1, new_line: 1 }, #   A
-          { old_path: file_name,                      old_line: 2              }, # - B
-          {                      new_path: file_name,              new_line: 2 }, # + BB
-          { old_path: file_name, new_path: file_name, old_line: 3, new_line: 3 }, #   C
-          { old_path: file_name, new_path: file_name, old_line: 4, new_line: 4 }, #   D
-          { old_path: file_name, new_path: file_name, old_line: 5, new_line: 5 }, #   E
-          { old_path: file_name,                      old_line: 6              }, # - F
-          {                      new_path: file_name,              new_line: 6 }, # + FF
-          {                      new_path: file_name,              new_line: 7 }, # + G
-        ]
-
-        new_position_attrs = [
-          { old_path: file_name, new_path: file_name, old_line: 1, new_line: 4 }, #   A
-          { old_path: file_name,                      old_line: 2              }, # - B
-          {                      new_path: file_name,              new_line: 5 }, # + BB
-          { old_path: file_name, new_path: file_name, old_line: 3, new_line: 6 }, #   C
-          { old_path: file_name, new_path: file_name, old_line: 4, new_line: 7 }, #   D
-          { old_path: file_name, new_path: file_name, old_line: 5, new_line: 8 }, #   E
-          { old_path: file_name,                      old_line: 6              }, # - F
-          {                      new_path: file_name,              new_line: 9 }, # + FF
-          {                      new_path: file_name,              new_line: 10 }, # + G
-        ]
-
-        expect_new_positions(old_position_attrs, new_position_attrs)
-      end
-    end
-
-    describe "merge of target branch" do
-      let(:merge_commit) do
-        second_create_file_commit
-
-        merge_request = create(:merge_request, source_branch: second_branch_name, target_branch: branch_name, source_project: project)
-
-        repository.merge(current_user, merge_request.diff_head_sha, merge_request, "Merge branches")
-
-        project.commit(branch_name)
-      end
-
-      let(:old_diff_refs) { diff_refs(create_file_commit, update_file_again_commit) }
-      let(:new_diff_refs) { diff_refs(create_file_commit, merge_commit) }
-      let(:change_diff_refs) { diff_refs(update_file_again_commit, merge_commit) }
-
-      # old diff:
-      # 1 1   A
-      # 2   - B
-      #   2 + BB
-      # 3 3   C
-      # 4 4   D
-      # 5 5   E
-      # 6   - F
-      #   6 + FF
-      #   7 + G
-      #
-      # new diff:
-      #   1 + Z
-      #   2 + Z
-      #   3 + Z
-      # 1 4   A
-      # 2   - B
-      #   5 + BB
-      # 3 6   C
-      # 4 7   D
-      # 5 8   E
-      # 6   - F
-      #   9 + FF
-      #   0 + G
-
-      it "returns the new positions" do
-        old_position_attrs = [
-          { old_path: file_name, new_path: file_name, old_line: 1, new_line: 1 }, #   A
-          { old_path: file_name,                      old_line: 2              }, # - B
-          {                      new_path: file_name,              new_line: 2 }, # + BB
-          { old_path: file_name, new_path: file_name, old_line: 3, new_line: 3 }, #   C
-          { old_path: file_name, new_path: file_name, old_line: 4, new_line: 4 }, #   D
-          { old_path: file_name, new_path: file_name, old_line: 5, new_line: 5 }, #   E
-          { old_path: file_name,                      old_line: 6              }, # - F
-          {                      new_path: file_name,              new_line: 6 }, # + FF
-          {                      new_path: file_name,              new_line: 7 }, # + G
-        ]
-
-        new_position_attrs = [
-          { old_path: file_name, new_path: file_name, old_line: 1, new_line: 4 }, #   A
-          { old_path: file_name,                      old_line: 2              }, # - B
-          {                      new_path: file_name,              new_line: 5 }, # + BB
-          { old_path: file_name, new_path: file_name, old_line: 3, new_line: 6 }, #   C
-          { old_path: file_name, new_path: file_name, old_line: 4, new_line: 7 }, #   D
-          { old_path: file_name, new_path: file_name, old_line: 5, new_line: 8 }, #   E
-          { old_path: file_name,                      old_line: 6              }, # - F
-          {                      new_path: file_name,              new_line: 9 }, # + FF
-          {                      new_path: file_name,              new_line: 10 }, # + G
-        ]
-
-        expect_new_positions(old_position_attrs, new_position_attrs)
-      end
-    end
-
-    describe "changing target branch" do
-      let(:old_diff_refs) { diff_refs(create_file_commit, update_file_again_commit) }
-      let(:new_diff_refs) { diff_refs(update_file_commit, update_file_again_commit) }
-      let(:change_diff_refs) { diff_refs(create_file_commit, update_file_commit) }
-
-      # old diff:
-      # 1 1   A
-      # 2   - B
-      #   2 + BB
-      # 3 3   C
-      # 4 4   D
-      # 5 5   E
-      # 6   - F
-      #   6 + FF
-      #   7 + G
-      #
-      # new diff:
-      # 1 1   A
-      #   2 + BB
-      # 2 3   C
-      # 3   - DD
-      #   4 + D
-      # 4 5   E
-      # 5   - F
-      #   6 + FF
-      #   7   G
-
-      it "returns the new positions" do
-        old_position_attrs = [
-          { old_path: file_name, new_path: file_name, old_line: 1, new_line: 1 }, #   A
-          { old_path: file_name,                      old_line: 2              }, # - B
-          {                      new_path: file_name,              new_line: 2 }, # + BB
-          { old_path: file_name, new_path: file_name, old_line: 3, new_line: 3 }, #   C
-          { old_path: file_name, new_path: file_name, old_line: 4, new_line: 4 }, #   D
-          { old_path: file_name, new_path: file_name, old_line: 5, new_line: 5 }, #   E
-          { old_path: file_name,                      old_line: 6              }, # - F
-          {                      new_path: file_name,              new_line: 6 }, # + FF
-          {                      new_path: file_name,              new_line: 7 }, # + G
-        ]
-
-        new_position_attrs = [
-          { old_path: file_name, new_path: file_name, old_line: 1, new_line: 1 },
-          { old_path: file_name,                      old_line: 2, change: true },
-          {                      new_path: file_name,              new_line: 2 },
-          { old_path: file_name, new_path: file_name, old_line: 2, new_line: 3 },
-          {                      new_path: file_name,              new_line: 4 },
-          { old_path: file_name, new_path: file_name, old_line: 4, new_line: 5 },
-          { old_path: file_name,                      old_line: 5              },
-          {                      new_path: file_name,              new_line: 6 },
-          {                      new_path: file_name,              new_line: 7 }
-        ]
+    describe '#cd_diffs' do
+      it 'returns the diffs in the new diff' do
+        diff_refs = subject.cd_diffs.diff_refs
 
-        expect_new_positions(old_position_attrs, new_position_attrs)
+        expect(diff_refs.base_sha).to eq(new_diff_refs.base_sha)
+        expect(diff_refs.start_sha).to eq(new_diff_refs.base_sha)
+        expect(diff_refs.head_sha).to eq(new_diff_refs.head_sha)
       end
     end
   end
diff --git a/spec/lib/gitlab/git/commit_spec.rb b/spec/lib/gitlab/git/commit_spec.rb
index 25052a79916..3f0e6b34291 100644
--- a/spec/lib/gitlab/git/commit_spec.rb
+++ b/spec/lib/gitlab/git/commit_spec.rb
@@ -408,7 +408,7 @@ describe Gitlab::Git::Commit, :seed_helper do
 
       context 'when oids is empty' do
         it 'makes no Gitaly request' do
-          expect(Gitlab::GitalyClient).not_to receive(:call)
+          expect(Gitlab::GitalyClient).not_to receive(:call).with(repository.storage, :commit_service, :list_commits_by_oid)
 
           described_class.batch_by_oid(repository, [])
         end
diff --git a/spec/lib/gitlab/git/repository_spec.rb b/spec/lib/gitlab/git/repository_spec.rb
index cceeae8afe6..a28b95e5bff 100644
--- a/spec/lib/gitlab/git/repository_spec.rb
+++ b/spec/lib/gitlab/git/repository_spec.rb
@@ -1694,14 +1694,15 @@ describe Gitlab::Git::Repository, :seed_helper do
     let(:branch_head) { '6d394385cf567f80a8fd85055db1ab4c5295806f' }
     let(:left_sha) { 'cfe32cf61b73a0d5e9f13e774abde7ff789b1660' }
     let(:right_branch) { 'test-master' }
+    let(:first_parent_ref) { 'refs/heads/test-master' }
     let(:target_ref) { 'refs/merge-requests/999/merge' }
 
     before do
-      repository.create_branch(right_branch, branch_head) unless repository.branch_exists?(right_branch)
+      repository.create_branch(right_branch, branch_head) unless repository.ref_exists?(first_parent_ref)
     end
 
     def merge_to_ref
-      repository.merge_to_ref(user, left_sha, right_branch, target_ref, 'Merge message')
+      repository.merge_to_ref(user, left_sha, right_branch, target_ref, 'Merge message', first_parent_ref)
     end
 
     it 'generates a commit in the target_ref' do
@@ -1716,7 +1717,7 @@ describe Gitlab::Git::Repository, :seed_helper do
     end
 
     it 'does not change the right branch HEAD' do
-      expect { merge_to_ref }.not_to change { repository.find_branch(right_branch).target }
+      expect { merge_to_ref }.not_to change { repository.commit(first_parent_ref).sha }
     end
   end
 
diff --git a/spec/lib/gitlab/git/rugged_impl/use_rugged_spec.rb b/spec/lib/gitlab/git/rugged_impl/use_rugged_spec.rb
new file mode 100644
index 00000000000..f957ed00945
--- /dev/null
+++ b/spec/lib/gitlab/git/rugged_impl/use_rugged_spec.rb
@@ -0,0 +1,97 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+require 'json'
+require 'tempfile'
+
+describe Gitlab::Git::RuggedImpl::UseRugged, :seed_helper do
+  let(:project) { create(:project, :repository) }
+  let(:repository) { project.repository }
+  let(:feature_flag_name) { 'feature-flag-name' }
+  let(:feature_flag) { Feature.get(feature_flag_name) }
+  let(:temp_gitaly_metadata_file) { create_temporary_gitaly_metadata_file }
+
+  before(:all) do
+    create_gitaly_metadata_file
+  end
+
+  subject(:wrapper) do
+    klazz = Class.new { include Gitlab::Git::RuggedImpl::UseRugged }
+    klazz.new
+  end
+
+  before do
+    Gitlab::GitalyClient.instance_variable_set(:@can_use_disk, {})
+  end
+
+  context 'when feature flag is not persisted' do
+    before do
+      allow(Feature).to receive(:persisted?).with(feature_flag).and_return(false)
+    end
+
+    it 'returns true when gitaly matches disk' do
+      expect(subject.use_rugged?(repository, feature_flag_name)).to be true
+    end
+
+    it 'returns false when disk access fails' do
+      allow(Gitlab::GitalyClient).to receive(:storage_metadata_file_path).and_return("/fake/path/doesnt/exist")
+
+      expect(subject.use_rugged?(repository, feature_flag_name)).to be false
+    end
+
+    it "returns false when gitaly doesn't match disk" do
+      allow(Gitlab::GitalyClient).to receive(:storage_metadata_file_path).and_return(temp_gitaly_metadata_file)
+
+      expect(subject.use_rugged?(repository, feature_flag_name)).to be_falsey
+
+      File.delete(temp_gitaly_metadata_file)
+    end
+
+    it "doesn't lead to a second rpc call because gitaly client should use the cached value" do
+      expect(subject.use_rugged?(repository, feature_flag_name)).to be true
+
+      expect(Gitlab::GitalyClient).not_to receive(:filesystem_id)
+
+      subject.use_rugged?(repository, feature_flag_name)
+    end
+  end
+
+  context 'when feature flag is persisted' do
+    before do
+      allow(Feature).to receive(:persisted?).with(feature_flag).and_return(true)
+    end
+
+    it 'returns false when the feature flag is off' do
+      allow(feature_flag).to receive(:enabled?).and_return(false)
+
+      expect(subject.use_rugged?(repository, feature_flag_name)).to be_falsey
+    end
+
+    it "returns true when feature flag is on" do
+      allow(feature_flag).to receive(:enabled?).and_return(true)
+      allow(Gitlab::GitalyClient).to receive(:can_use_disk?).and_return(false)
+
+      expect(subject.use_rugged?(repository, feature_flag_name)).to be true
+    end
+  end
+
+  def create_temporary_gitaly_metadata_file
+    tmp = Tempfile.new('.gitaly-metadata')
+    gitaly_metadata = {
+      "gitaly_filesystem_id" => "some-value"
+    }
+    tmp.write(gitaly_metadata.to_json)
+    tmp.flush
+    tmp.close
+    tmp.path
+  end
+
+  def create_gitaly_metadata_file
+    File.open(File.join(SEED_STORAGE_PATH, '.gitaly-metadata'), 'w+') do |f|
+      gitaly_metadata = {
+        "gitaly_filesystem_id" => SecureRandom.uuid
+      }
+      f.write(gitaly_metadata.to_json)
+    end
+  end
+end
diff --git a/spec/lib/gitlab/gitaly_client/operation_service_spec.rb b/spec/lib/gitlab/gitaly_client/operation_service_spec.rb
index 18663a72fcd..f38b8d31237 100644
--- a/spec/lib/gitlab/gitaly_client/operation_service_spec.rb
+++ b/spec/lib/gitlab/gitaly_client/operation_service_spec.rb
@@ -79,13 +79,13 @@ describe Gitlab::GitalyClient::OperationService do
     end
 
     describe '#user_merge_to_ref' do
-      let(:branch) { 'my-branch' }
+      let(:first_parent_ref) { 'refs/heads/my-branch' }
       let(:source_sha) { 'cfe32cf61b73a0d5e9f13e774abde7ff789b1660' }
       let(:ref) { 'refs/merge-requests/x/merge' }
       let(:message) { 'validación' }
       let(:response) { Gitaly::UserMergeToRefResponse.new(commit_id: 'new-commit-id') }
 
-      subject { client.user_merge_to_ref(user, source_sha, branch, ref, message) }
+      subject { client.user_merge_to_ref(user, source_sha, nil, ref, message, first_parent_ref) }
 
       it 'sends a user_merge_to_ref message' do
         expect_any_instance_of(Gitaly::OperationService::Stub)
diff --git a/spec/lib/gitlab/graphql/calls_gitaly/instrumentation_spec.rb b/spec/lib/gitlab/graphql/calls_gitaly/instrumentation_spec.rb
new file mode 100644
index 00000000000..d93ce464a92
--- /dev/null
+++ b/spec/lib/gitlab/graphql/calls_gitaly/instrumentation_spec.rb
@@ -0,0 +1,23 @@
+# frozen_string_literal: true
+require 'spec_helper'
+
+describe Gitlab::Graphql::CallsGitaly::Instrumentation do
+  subject { described_class.new }
+
+  describe '#calls_gitaly_check' do
+    let(:gitaly_field) { Types::BaseField.new(name: 'test', type: GraphQL::STRING_TYPE, null: true, calls_gitaly: true) }
+    let(:no_gitaly_field) { Types::BaseField.new(name: 'test', type: GraphQL::STRING_TYPE, null: true, calls_gitaly: false) }
+
+    context 'if there are no Gitaly calls' do
+      it 'does not raise an error if calls_gitaly is false' do
+        expect { subject.send(:calls_gitaly_check, no_gitaly_field, 0) }.not_to raise_error
+      end
+    end
+
+    context 'if there is at least 1 Gitaly call' do
+      it 'raises an error if calls_gitaly: is false or not defined' do
+        expect { subject.send(:calls_gitaly_check, no_gitaly_field, 1) }.to raise_error(/specify a constant complexity or add `calls_gitaly: true`/)
+      end
+    end
+  end
+end
diff --git a/spec/lib/gitlab/metrics/samplers/ruby_sampler_spec.rb b/spec/lib/gitlab/metrics/samplers/ruby_sampler_spec.rb
index aaf8c9fa2a0..4d93b70e6e3 100644
--- a/spec/lib/gitlab/metrics/samplers/ruby_sampler_spec.rb
+++ b/spec/lib/gitlab/metrics/samplers/ruby_sampler_spec.rb
@@ -8,12 +8,19 @@ describe Gitlab::Metrics::Samplers::RubySampler do
     allow(Gitlab::Metrics::NullMetric).to receive(:instance).and_return(null_metric)
   end
 
+  describe '#initialize' do
+    it 'sets process_start_time_seconds' do
+      Timecop.freeze do
+        expect(sampler.metrics[:process_start_time_seconds].get).to eq(Time.now.to_i)
+      end
+    end
+  end
+
   describe '#sample' do
     it 'samples various statistics' do
       expect(Gitlab::Metrics::System).to receive(:cpu_time)
       expect(Gitlab::Metrics::System).to receive(:file_descriptor_count)
       expect(Gitlab::Metrics::System).to receive(:memory_usage)
-      expect(Gitlab::Metrics::System).to receive(:process_start_time)
       expect(Gitlab::Metrics::System).to receive(:max_open_file_descriptors)
       expect(sampler).to receive(:sample_gc)
 
@@ -44,13 +51,6 @@ describe Gitlab::Metrics::Samplers::RubySampler do
       sampler.sample
     end
 
-    it 'adds a metric containing the process start time' do
-      expect(Gitlab::Metrics::System).to receive(:process_start_time).and_return(12345)
-      expect(sampler.metrics[:process_start_time_seconds]).to receive(:set).with({}, 12345)
-
-      sampler.sample
-    end
-
     it 'adds a metric containing the process max file descriptors' do
       expect(Gitlab::Metrics::System).to receive(:max_open_file_descriptors).and_return(1024)
       expect(sampler.metrics[:process_max_fds]).to receive(:set).with({}, 1024)
diff --git a/spec/lib/gitlab/metrics/system_spec.rb b/spec/lib/gitlab/metrics/system_spec.rb
index da87df15746..3b434a02f63 100644
--- a/spec/lib/gitlab/metrics/system_spec.rb
+++ b/spec/lib/gitlab/metrics/system_spec.rb
@@ -19,12 +19,6 @@ describe Gitlab::Metrics::System do
         expect(described_class.max_open_file_descriptors).to be > 0
       end
     end
-
-    describe '.process_start_time' do
-      it 'returns the process start time' do
-        expect(described_class.process_start_time).to be > 0
-      end
-    end
   else
     describe '.memory_usage' do
       it 'returns 0.0' do
@@ -43,12 +37,6 @@ describe Gitlab::Metrics::System do
         expect(described_class.max_open_file_descriptors).to eq(0)
       end
     end
-
-    describe 'process_start_time' do
-      it 'returns 0' do
-        expect(described_class.process_start_time).to eq(0)
-      end
-    end
   end
 
   describe '.cpu_time' do
diff --git a/spec/lib/gitlab/namespaced_session_store_spec.rb b/spec/lib/gitlab/namespaced_session_store_spec.rb
index c0af2ede32a..e177c44ad67 100644
--- a/spec/lib/gitlab/namespaced_session_store_spec.rb
+++ b/spec/lib/gitlab/namespaced_session_store_spec.rb
@@ -4,19 +4,33 @@ require 'spec_helper'
 
 describe Gitlab::NamespacedSessionStore do
   let(:key) { :some_key }
-  subject { described_class.new(key) }
 
-  it 'stores data under the specified key' do
-    Gitlab::Session.with_session({}) do
-      subject[:new_data] = 123
+  context 'current session' do
+    subject { described_class.new(key) }
 
-      expect(Thread.current[:session_storage][key]).to eq(new_data: 123)
+    it 'stores data under the specified key' do
+      Gitlab::Session.with_session({}) do
+        subject[:new_data] = 123
+
+        expect(Thread.current[:session_storage][key]).to eq(new_data: 123)
+      end
+    end
+
+    it 'retrieves data from the given key' do
+      Thread.current[:session_storage] = { key => { existing_data: 123 } }
+
+      expect(subject[:existing_data]).to eq 123
     end
   end
 
-  it 'retrieves data from the given key' do
-    Thread.current[:session_storage] = { key => { existing_data: 123 } }
+  context 'passed in session' do
+    let(:data) { { 'data' => 42 } }
+    let(:session) { { 'some_key' => data } }
+
+    subject { described_class.new(key, session.with_indifferent_access) }
 
-    expect(subject[:existing_data]).to eq 123
+    it 'retrieves data from the given key' do
+      expect(subject['data']).to eq 42
+    end
   end
 end
diff --git a/spec/lib/gitlab/performance_bar_spec.rb b/spec/lib/gitlab/performance_bar_spec.rb
index f480376acb4..ee3c571c9c0 100644
--- a/spec/lib/gitlab/performance_bar_spec.rb
+++ b/spec/lib/gitlab/performance_bar_spec.rb
@@ -3,17 +3,42 @@ require 'spec_helper'
 describe Gitlab::PerformanceBar do
   shared_examples 'allowed user IDs are cached' do
     before do
-      # Warm the Redis cache
+      # Warm the caches
       described_class.enabled?(user)
     end
 
     it 'caches the allowed user IDs in cache', :use_clean_rails_memory_store_caching do
       expect do
+        expect(described_class.l1_cache_backend).to receive(:fetch).and_call_original
+        expect(described_class.l2_cache_backend).not_to receive(:fetch)
         expect(described_class.enabled?(user)).to be_truthy
       end.not_to exceed_query_limit(0)
     end
+
+    it 'caches the allowed user IDs in L1 cache for 1 minute', :use_clean_rails_memory_store_caching do
+      Timecop.travel 2.minutes do
+        expect do
+          expect(described_class.l1_cache_backend).to receive(:fetch).and_call_original
+          expect(described_class.l2_cache_backend).to receive(:fetch).and_call_original
+          expect(described_class.enabled?(user)).to be_truthy
+        end.not_to exceed_query_limit(0)
+      end
+    end
+
+    it 'caches the allowed user IDs in L2 cache for 5 minutes', :use_clean_rails_memory_store_caching do
+      Timecop.travel 6.minutes do
+        expect do
+          expect(described_class.l1_cache_backend).to receive(:fetch).and_call_original
+          expect(described_class.l2_cache_backend).to receive(:fetch).and_call_original
+          expect(described_class.enabled?(user)).to be_truthy
+        end.not_to exceed_query_limit(2)
+      end
+    end
   end
 
+  it { expect(described_class.l1_cache_backend).to eq(Gitlab::ThreadMemoryCache.cache_backend) }
+  it { expect(described_class.l2_cache_backend).to eq(Rails.cache) }
+
   describe '.enabled?' do
     let(:user) { create(:user) }
 
diff --git a/spec/lib/gitlab/sql/pattern_spec.rb b/spec/lib/gitlab/sql/pattern_spec.rb
index 5b5052de372..98838712eae 100644
--- a/spec/lib/gitlab/sql/pattern_spec.rb
+++ b/spec/lib/gitlab/sql/pattern_spec.rb
@@ -10,6 +10,12 @@ describe Gitlab::SQL::Pattern do
       it 'returns exact matching pattern' do
         expect(to_pattern).to eq('12')
       end
+
+      context 'and ignore_minimum_char_limit is true' do
+        it 'returns partial matching pattern' do
+          expect(User.to_pattern(query, use_minimum_char_limit:  false)).to eq('%12%')
+        end
+      end
     end
 
     context 'when a query with a escape character is shorter than 3 chars' do
@@ -18,6 +24,12 @@ describe Gitlab::SQL::Pattern do
       it 'returns sanitized exact matching pattern' do
         expect(to_pattern).to eq('\_2')
       end
+
+      context 'and ignore_minimum_char_limit is true' do
+        it 'returns sanitized partial matching pattern' do
+          expect(User.to_pattern(query, use_minimum_char_limit:  false)).to eq('%\_2%')
+        end
+      end
     end
 
     context 'when a query is equal to 3 chars' do
diff --git a/spec/lib/gitlab/user_extractor_spec.rb b/spec/lib/gitlab/user_extractor_spec.rb
deleted file mode 100644
index b86ec5445b8..00000000000
--- a/spec/lib/gitlab/user_extractor_spec.rb
+++ /dev/null
@@ -1,78 +0,0 @@
-# frozen_string_literal: true
-
-require 'spec_helper'
-
-describe Gitlab::UserExtractor do
-  let(:text) do
-    <<~TXT
-    This is a long texth that mentions some users.
-    @user-1, @user-2 and user@gitlab.org take a walk in the park.
-    There they meet @user-4 that was out with other-user@gitlab.org.
-    @user-1 thought it was late, so went home straight away
-    TXT
-  end
-  subject(:extractor) { described_class.new(text) }
-
-  describe '#users' do
-    it 'returns an empty relation when nil was passed' do
-      extractor = described_class.new(nil)
-
-      expect(extractor.users).to be_empty
-      expect(extractor.users).to be_a(ActiveRecord::Relation)
-    end
-
-    it 'returns the user case insensitive for usernames' do
-      user = create(:user, username: "USER-4")
-
-      expect(extractor.users).to include(user)
-    end
-
-    it 'returns users by primary email' do
-      user = create(:user, email: 'user@gitlab.org')
-
-      expect(extractor.users).to include(user)
-    end
-
-    it 'returns users by secondary email' do
-      user = create(:email, email: 'other-user@gitlab.org').user
-
-      expect(extractor.users).to include(user)
-    end
-
-    context 'input as array of strings' do
-      it 'is treated as one string' do
-        extractor = described_class.new(text.lines)
-
-        user_1 = create(:user, username: "USER-1")
-        user_4 = create(:user, username: "USER-4")
-        user_email = create(:user, email: 'user@gitlab.org')
-
-        expect(extractor.users).to contain_exactly(user_1, user_4, user_email)
-      end
-    end
-  end
-
-  describe '#matches' do
-    it 'includes all mentioned email adresses' do
-      expect(extractor.matches[:emails]).to contain_exactly('user@gitlab.org', 'other-user@gitlab.org')
-    end
-
-    it 'includes all mentioned usernames' do
-      expect(extractor.matches[:usernames]).to contain_exactly('user-1', 'user-2', 'user-4')
-    end
-
-    context 'input has no matching e-mail or usernames' do
-      it 'returns an empty list of users' do
-        extractor = described_class.new('My test')
-
-        expect(extractor.users).to be_empty
-      end
-    end
-  end
-
-  describe '#references' do
-    it 'includes all user-references once' do
-      expect(extractor.references).to contain_exactly('user-1', 'user-2', 'user@gitlab.org', 'user-4', 'other-user@gitlab.org')
-    end
-  end
-end
diff --git a/spec/lib/peek/views/redis_detailed_spec.rb b/spec/lib/peek/views/redis_detailed_spec.rb
new file mode 100644
index 00000000000..da13b6df53b
--- /dev/null
+++ b/spec/lib/peek/views/redis_detailed_spec.rb
@@ -0,0 +1,36 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe Peek::Views::RedisDetailed do
+  let(:redis_detailed_class) do
+    Class.new do
+      include Peek::Views::RedisDetailed
+    end
+  end
+
+  subject { redis_detailed_class.new }
+
+  using RSpec::Parameterized::TableSyntax
+
+  where(:cmd, :expected) do
+    [:auth, 'test'] | 'auth <redacted>'
+    [:set, 'key', 'value'] | 'set key <redacted>'
+    [:set, 'bad'] | 'set bad'
+    [:hmset, 'key1', 'value1', 'key2', 'value2'] | 'hmset key1 <redacted>'
+    [:get, 'key'] | 'get key'
+  end
+
+  with_them do
+    it 'scrubs Redis commands', :request_store do
+      subject.detail_store << { cmd: cmd, duration: 1.second }
+
+      expect(subject.details.count).to eq(1)
+      expect(subject.details.first)
+        .to eq({
+                 cmd: expected,
+                 duration: 1000
+               })
+    end
+  end
+end
diff --git a/spec/migrations/backfill_store_project_full_path_in_repo_spec.rb b/spec/migrations/backfill_store_project_full_path_in_repo_spec.rb
index 34f4a36d63d..65a918d5440 100644
--- a/spec/migrations/backfill_store_project_full_path_in_repo_spec.rb
+++ b/spec/migrations/backfill_store_project_full_path_in_repo_spec.rb
@@ -13,7 +13,7 @@ describe BackfillStoreProjectFullPathInRepo, :migration do
   subject(:migration) { described_class.new }
 
   around do |example|
-    Sidekiq::Testing.inline! do
+    perform_enqueued_jobs do
       example.run
     end
   end
diff --git a/spec/models/ci/pipeline_spec.rb b/spec/models/ci/pipeline_spec.rb
index 55cea48b641..e24bbc39761 100644
--- a/spec/models/ci/pipeline_spec.rb
+++ b/spec/models/ci/pipeline_spec.rb
@@ -2998,4 +2998,28 @@ describe Ci::Pipeline, :mailer do
       end
     end
   end
+
+  describe '#error_messages' do
+    subject { pipeline.error_messages }
+
+    before do
+      pipeline.valid?
+    end
+
+    context 'when pipeline has errors' do
+      let(:pipeline) { build(:ci_pipeline, sha: nil, ref: nil) }
+
+      it 'returns the full error messages' do
+        is_expected.to eq("Sha can't be blank and Ref can't be blank")
+      end
+    end
+
+    context 'when pipeline does not have errors' do
+      let(:pipeline) { build(:ci_pipeline) }
+
+      it 'returns empty string' do
+        is_expected.to be_empty
+      end
+    end
+  end
 end
diff --git a/spec/models/clusters/clusters_hierarchy_spec.rb b/spec/models/clusters/clusters_hierarchy_spec.rb
new file mode 100644
index 00000000000..0470ebe17ea
--- /dev/null
+++ b/spec/models/clusters/clusters_hierarchy_spec.rb
@@ -0,0 +1,73 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe Clusters::ClustersHierarchy do
+  describe '#base_and_ancestors' do
+    def base_and_ancestors(clusterable)
+      described_class.new(clusterable).base_and_ancestors
+    end
+
+    context 'project in nested group with clusters at every level' do
+      let!(:cluster) { create(:cluster, :project, projects: [project]) }
+      let!(:child) { create(:cluster, :group, groups: [child_group]) }
+      let!(:parent) { create(:cluster, :group, groups: [parent_group]) }
+      let!(:ancestor) { create(:cluster, :group, groups: [ancestor_group]) }
+
+      let(:ancestor_group) { create(:group) }
+      let(:parent_group) { create(:group, parent: ancestor_group) }
+      let(:child_group) { create(:group, parent: parent_group) }
+      let(:project) { create(:project, group: child_group) }
+
+      it 'returns clusters for project' do
+        expect(base_and_ancestors(project)).to eq([cluster, child, parent, ancestor])
+      end
+
+      it 'returns clusters for child_group' do
+        expect(base_and_ancestors(child_group)).to eq([child, parent, ancestor])
+      end
+
+      it 'returns clusters for parent_group' do
+        expect(base_and_ancestors(parent_group)).to eq([parent, ancestor])
+      end
+
+      it 'returns clusters for ancestor_group' do
+        expect(base_and_ancestors(ancestor_group)).to eq([ancestor])
+      end
+    end
+
+    context 'project in a namespace' do
+      let!(:cluster) { create(:cluster, :project) }
+
+      it 'returns clusters for project' do
+        expect(base_and_ancestors(cluster.project)).to eq([cluster])
+      end
+    end
+
+    context 'project in nested group with clusters at some levels' do
+      let!(:child) { create(:cluster, :group, groups: [child_group]) }
+      let!(:ancestor) { create(:cluster, :group, groups: [ancestor_group]) }
+
+      let(:ancestor_group) { create(:group) }
+      let(:parent_group) { create(:group, parent: ancestor_group) }
+      let(:child_group) { create(:group, parent: parent_group) }
+      let(:project) { create(:project, group: child_group) }
+
+      it 'returns clusters for project' do
+        expect(base_and_ancestors(project)).to eq([child, ancestor])
+      end
+
+      it 'returns clusters for child_group' do
+        expect(base_and_ancestors(child_group)).to eq([child, ancestor])
+      end
+
+      it 'returns clusters for parent_group' do
+        expect(base_and_ancestors(parent_group)).to eq([ancestor])
+      end
+
+      it 'returns clusters for ancestor_group' do
+        expect(base_and_ancestors(ancestor_group)).to eq([ancestor])
+      end
+    end
+  end
+end
diff --git a/spec/models/concerns/deployment_platform_spec.rb b/spec/models/concerns/deployment_platform_spec.rb
index 2378f400540..e2fc8a5d127 100644
--- a/spec/models/concerns/deployment_platform_spec.rb
+++ b/spec/models/concerns/deployment_platform_spec.rb
@@ -5,7 +5,7 @@ require 'rails_helper'
 describe DeploymentPlatform do
   let(:project) { create(:project) }
 
-  describe '#deployment_platform' do
+  shared_examples '#deployment_platform' do
     subject { project.deployment_platform }
 
     context 'with no Kubernetes configuration on CI/CD, no Kubernetes Service' do
@@ -84,4 +84,20 @@ describe DeploymentPlatform do
       end
     end
   end
+
+  context 'legacy implementation' do
+    before do
+      stub_feature_flags(clusters_cte: false)
+    end
+
+    include_examples '#deployment_platform'
+  end
+
+  context 'CTE implementation' do
+    before do
+      stub_feature_flags(clusters_cte: true)
+    end
+
+    include_examples '#deployment_platform'
+  end
 end
diff --git a/spec/models/concerns/issuable_spec.rb b/spec/models/concerns/issuable_spec.rb
index 64f02978d79..68224a56515 100644
--- a/spec/models/concerns/issuable_spec.rb
+++ b/spec/models/concerns/issuable_spec.rb
@@ -223,6 +223,16 @@ describe Issuable do
       expect(issuable_class.full_search(searchable_issue2.description.downcase)).to eq([searchable_issue2])
     end
 
+    it 'returns issues with a fuzzy matching description for a query shorter than 3 chars if told to do so' do
+      search = searchable_issue2.description.downcase.scan(/\w+/).sample[-1]
+
+      expect(issuable_class.full_search(search, use_minimum_char_limit: false)).to include(searchable_issue2)
+    end
+
+    it 'returns issues with a fuzzy matching title for a query shorter than 3 chars if told to do so' do
+      expect(issuable_class.full_search('i', use_minimum_char_limit: false)).to include(searchable_issue)
+    end
+
     context 'when matching columns is "title"' do
       it 'returns issues with a matching title' do
         expect(issuable_class.full_search(searchable_issue.title, matched_columns: 'title'))
diff --git a/spec/models/concerns/reactive_caching_spec.rb b/spec/models/concerns/reactive_caching_spec.rb
index 7faa196623f..3d026932f59 100644
--- a/spec/models/concerns/reactive_caching_spec.rb
+++ b/spec/models/concerns/reactive_caching_spec.rb
@@ -47,30 +47,12 @@ describe ReactiveCaching, :use_clean_rails_memory_store_caching do
 
     subject(:go!) { instance.result }
 
-    context 'when cache is empty' do
-      it { is_expected.to be_nil }
-
-      it 'enqueues a background worker to bootstrap the cache' do
-        expect(ReactiveCachingWorker).to receive(:perform_async).with(CacheTest, 666)
-
-        go!
-      end
-
-      it 'updates the cache lifespan' do
-        expect(reactive_cache_alive?(instance)).to be_falsy
-
-        go!
-
-        expect(reactive_cache_alive?(instance)).to be_truthy
-      end
-    end
-
-    context 'when the cache is full' do
+    shared_examples 'a cacheable value' do |cached_value|
       before do
-        stub_reactive_cache(instance, 4)
+        stub_reactive_cache(instance, cached_value)
       end
 
-      it { is_expected.to eq(4) }
+      it { is_expected.to eq(cached_value) }
 
       it 'does not enqueue a background worker' do
         expect(ReactiveCachingWorker).not_to receive(:perform_async)
@@ -90,9 +72,7 @@ describe ReactiveCaching, :use_clean_rails_memory_store_caching do
         end
 
         it { is_expected.to be_nil }
-      end
 
-      context 'when cache was invalidated' do
         it 'refreshes cache' do
           expect(ReactiveCachingWorker).to receive(:perform_async).with(CacheTest, 666)
 
@@ -101,12 +81,34 @@ describe ReactiveCaching, :use_clean_rails_memory_store_caching do
       end
     end
 
-    context 'when cache contains non-nil but blank value' do
-      before do
-        stub_reactive_cache(instance, false)
+    context 'when cache is empty' do
+      it { is_expected.to be_nil }
+
+      it 'enqueues a background worker to bootstrap the cache' do
+        expect(ReactiveCachingWorker).to receive(:perform_async).with(CacheTest, 666)
+
+        go!
       end
 
-      it { is_expected.to eq(false) }
+      it 'updates the cache lifespan' do
+        expect(reactive_cache_alive?(instance)).to be_falsy
+
+        go!
+
+        expect(reactive_cache_alive?(instance)).to be_truthy
+      end
+    end
+
+    context 'when the cache is full' do
+      it_behaves_like 'a cacheable value', 4
+    end
+
+    context 'when the cache contains non-nil but blank value' do
+      it_behaves_like 'a cacheable value', false
+    end
+
+    context 'when the cache contains nil value' do
+      it_behaves_like 'a cacheable value', nil
     end
   end
 
@@ -206,8 +208,9 @@ describe ReactiveCaching, :use_clean_rails_memory_store_caching do
           expect(read_reactive_cache(instance)).to eq("preexisting")
         end
 
-        it 'enqueues a repeat worker' do
-          expect_reactive_cache_update_queued(instance)
+        it 'does not enqueue a repeat worker' do
+          expect(ReactiveCachingWorker)
+            .not_to receive(:perform_in)
 
           expect { go! }.to raise_error("foo")
         end
diff --git a/spec/models/deployment_metrics_spec.rb b/spec/models/deployment_metrics_spec.rb
new file mode 100644
index 00000000000..0aadb1f3a5e
--- /dev/null
+++ b/spec/models/deployment_metrics_spec.rb
@@ -0,0 +1,126 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe DeploymentMetrics do
+  describe '#has_metrics?' do
+    subject { described_class.new(deployment.project, deployment).has_metrics? }
+
+    context 'when deployment is failed' do
+      let(:deployment) { create(:deployment, :failed) }
+
+      it { is_expected.to be_falsy }
+    end
+
+    context 'when deployment is success' do
+      let(:deployment) { create(:deployment, :success) }
+
+      context 'without a monitoring service' do
+        it { is_expected.to be_falsy }
+      end
+
+      context 'with a Prometheus Service' do
+        let(:prometheus_service) { instance_double(PrometheusService, can_query?: true) }
+
+        before do
+          allow(deployment.project).to receive(:find_or_initialize_service).with('prometheus').and_return prometheus_service
+        end
+
+        it { is_expected.to be_truthy }
+      end
+
+      context 'with a Prometheus Service that cannot query' do
+        let(:prometheus_service) { instance_double(PrometheusService, can_query?: false) }
+
+        before do
+          allow(deployment.project).to receive(:find_or_initialize_service).with('prometheus').and_return prometheus_service
+        end
+
+        it { is_expected.to be_falsy }
+      end
+
+      context 'with a cluster Prometheus' do
+        let(:deployment) { create(:deployment, :success, :on_cluster) }
+        let!(:prometheus) { create(:clusters_applications_prometheus, :installed, cluster: deployment.cluster) }
+
+        before do
+          expect(deployment.cluster.application_prometheus).to receive(:can_query?).and_return(true)
+        end
+
+        it { is_expected.to be_truthy }
+      end
+
+      context 'fallback deployment platform' do
+        let(:cluster) { create(:cluster, :provided_by_user, environment_scope: '*', projects: [deployment.project]) }
+        let!(:prometheus) { create(:clusters_applications_prometheus, :installed, cluster: cluster) }
+
+        before do
+          expect(deployment.project).to receive(:deployment_platform).and_return(cluster.platform)
+          expect(cluster.application_prometheus).to receive(:can_query?).and_return(true)
+        end
+
+        it { is_expected.to be_truthy }
+      end
+    end
+  end
+
+  describe '#metrics' do
+    let(:deployment) { create(:deployment, :success) }
+    let(:prometheus_adapter) { instance_double(PrometheusService, can_query?: true) }
+    let(:deployment_metrics) { described_class.new(deployment.project, deployment) }
+
+    subject { deployment_metrics.metrics }
+
+    context 'metrics are disabled' do
+      it { is_expected.to eq({}) }
+    end
+
+    context 'metrics are enabled' do
+      let(:simple_metrics) do
+        {
+          success: true,
+          metrics: {},
+          last_update: 42
+        }
+      end
+
+      before do
+        allow(deployment_metrics).to receive(:prometheus_adapter).and_return(prometheus_adapter)
+        expect(prometheus_adapter).to receive(:query).with(:deployment, deployment).and_return(simple_metrics)
+      end
+
+      it { is_expected.to eq(simple_metrics.merge({ deployment_time: deployment.created_at.to_i })) }
+    end
+  end
+
+  describe '#additional_metrics' do
+    let(:project) { create(:project, :repository) }
+    let(:deployment) { create(:deployment, :succeed, project: project) }
+    let(:deployment_metrics) { described_class.new(deployment.project, deployment) }
+
+    subject { deployment_metrics.additional_metrics }
+
+    context 'metrics are disabled' do
+      it { is_expected.to eq({}) }
+    end
+
+    context 'metrics are enabled' do
+      let(:simple_metrics) do
+        {
+          success: true,
+          metrics: {},
+          last_update: 42
+        }
+      end
+
+      let(:prometheus_adapter) { instance_double('prometheus_adapter', can_query?: true) }
+
+      before do
+        allow(deployment_metrics).to receive(:prometheus_adapter).and_return(prometheus_adapter)
+        expect(prometheus_adapter).to receive(:query).with(:additional_metrics_deployment, deployment).and_return(simple_metrics)
+      end
+
+      it { is_expected.to eq(simple_metrics.merge({ deployment_time: deployment.created_at.to_i })) }
+    end
+  end
+end
diff --git a/spec/models/deployment_spec.rb b/spec/models/deployment_spec.rb
index 8d0eb0f4a06..d4e631f109b 100644
--- a/spec/models/deployment_spec.rb
+++ b/spec/models/deployment_spec.rb
@@ -295,125 +295,6 @@ describe Deployment do
     end
   end
 
-  describe '#has_metrics?' do
-    subject { deployment.has_metrics? }
-
-    context 'when deployment is failed' do
-      let(:deployment) { create(:deployment, :failed) }
-
-      it { is_expected.to be_falsy }
-    end
-
-    context 'when deployment is success' do
-      let(:deployment) { create(:deployment, :success) }
-
-      context 'without a monitoring service' do
-        it { is_expected.to be_falsy }
-      end
-
-      context 'with a Prometheus Service' do
-        let(:prometheus_service) { double(:prometheus_service, can_query?: true) }
-
-        before do
-          allow(deployment.project).to receive(:find_or_initialize_service).with('prometheus').and_return prometheus_service
-        end
-
-        it { is_expected.to be_truthy }
-      end
-
-      context 'with a Prometheus Service that cannot query' do
-        let(:prometheus_service) { double(:prometheus_service, can_query?: false) }
-
-        before do
-          allow(deployment.project).to receive(:find_or_initialize_service).with('prometheus').and_return prometheus_service
-        end
-
-        it { is_expected.to be_falsy }
-      end
-
-      context 'with a cluster Prometheus' do
-        let(:deployment) { create(:deployment, :success, :on_cluster) }
-        let!(:prometheus) { create(:clusters_applications_prometheus, :installed, cluster: deployment.cluster) }
-
-        before do
-          expect(deployment.cluster.application_prometheus).to receive(:can_query?).and_return(true)
-        end
-
-        it { is_expected.to be_truthy }
-      end
-
-      context 'fallback deployment platform' do
-        let(:cluster) { create(:cluster, :provided_by_user, environment_scope: '*', projects: [deployment.project]) }
-        let!(:prometheus) { create(:clusters_applications_prometheus, :installed, cluster: cluster) }
-
-        before do
-          expect(deployment.project).to receive(:deployment_platform).and_return(cluster.platform)
-          expect(cluster.application_prometheus).to receive(:can_query?).and_return(true)
-        end
-
-        it { is_expected.to be_truthy }
-      end
-    end
-  end
-
-  describe '#metrics' do
-    let(:deployment) { create(:deployment, :success) }
-    let(:prometheus_adapter) { double('prometheus_adapter', can_query?: true) }
-
-    subject { deployment.metrics }
-
-    context 'metrics are disabled' do
-      it { is_expected.to eq({}) }
-    end
-
-    context 'metrics are enabled' do
-      let(:simple_metrics) do
-        {
-          success: true,
-          metrics: {},
-          last_update: 42
-        }
-      end
-
-      before do
-        allow(deployment).to receive(:prometheus_adapter).and_return(prometheus_adapter)
-        allow(prometheus_adapter).to receive(:query).with(:deployment, deployment).and_return(simple_metrics)
-      end
-
-      it { is_expected.to eq(simple_metrics.merge({ deployment_time: deployment.created_at.to_i })) }
-    end
-  end
-
-  describe '#additional_metrics' do
-    let(:project) { create(:project, :repository) }
-    let(:deployment) { create(:deployment, :succeed, project: project) }
-
-    subject { deployment.additional_metrics }
-
-    context 'metrics are disabled' do
-      it { is_expected.to eq({}) }
-    end
-
-    context 'metrics are enabled' do
-      let(:simple_metrics) do
-        {
-          success: true,
-          metrics: {},
-          last_update: 42
-        }
-      end
-
-      let(:prometheus_adapter) { double('prometheus_adapter', can_query?: true) }
-
-      before do
-        allow(deployment).to receive(:prometheus_adapter).and_return(prometheus_adapter)
-        allow(prometheus_adapter).to receive(:query).with(:additional_metrics_deployment, deployment).and_return(simple_metrics)
-      end
-
-      it { is_expected.to eq(simple_metrics.merge({ deployment_time: deployment.created_at.to_i })) }
-    end
-  end
-
   describe '#stop_action' do
     let(:build) { create(:ci_build) }
 
@@ -441,38 +322,4 @@ describe Deployment do
       end
     end
   end
-
-  describe '#deployment_platform_cluster' do
-    let(:deployment) { create(:deployment) }
-    let(:project) { deployment.project }
-    let(:environment) { deployment.environment }
-
-    subject { deployment.deployment_platform_cluster }
-
-    before do
-      expect(project).to receive(:deployment_platform)
-        .with(environment: environment.name).and_call_original
-    end
-
-    context 'project has no deployment platform' do
-      before do
-        expect(project.clusters).to be_empty
-      end
-
-      it { is_expected.to be_nil }
-    end
-
-    context 'project uses the kubernetes service for deployments' do
-      let!(:service) { create(:kubernetes_service, project: project) }
-
-      it { is_expected.to be_nil }
-    end
-
-    context 'project has a deployment platform' do
-      let!(:cluster) { create(:cluster, projects: [project]) }
-      let!(:platform) { create(:cluster_platform_kubernetes, cluster: cluster) }
-
-      it { is_expected.to eq cluster }
-    end
-  end
 end
diff --git a/spec/models/environment_status_spec.rb b/spec/models/environment_status_spec.rb
index c503c35305f..e2836420df9 100644
--- a/spec/models/environment_status_spec.rb
+++ b/spec/models/environment_status_spec.rb
@@ -11,11 +11,10 @@ describe EnvironmentStatus do
   let(:merge_request) { create(:merge_request, :deployed_review_app, deployment: deployment) }
   let(:sha)           { deployment.sha }
 
-  subject(:environment_status) { described_class.new(environment, merge_request, sha) }
+  subject(:environment_status) { described_class.new(project, environment, merge_request, sha) }
 
   it { is_expected.to delegate_method(:id).to(:environment) }
   it { is_expected.to delegate_method(:name).to(:environment) }
-  it { is_expected.to delegate_method(:project).to(:environment) }
   it { is_expected.to delegate_method(:deployed_at).to(:deployment) }
   it { is_expected.to delegate_method(:status).to(:deployment) }
 
diff --git a/spec/models/merge_request_spec.rb b/spec/models/merge_request_spec.rb
index a2547755510..9b0c232f370 100644
--- a/spec/models/merge_request_spec.rb
+++ b/spec/models/merge_request_spec.rb
@@ -7,6 +7,8 @@ describe MergeRequest do
   include ProjectForksHelper
   include ReactiveCachingHelpers
 
+  using RSpec::Parameterized::TableSyntax
+
   subject { create(:merge_request) }
 
   describe 'associations' do
@@ -1996,6 +1998,47 @@ describe MergeRequest do
     end
   end
 
+  describe '#rebase_async' do
+    let(:merge_request) { create(:merge_request) }
+    let(:user_id) { double(:user_id) }
+    let(:rebase_jid) { 'rebase-jid' }
+
+    subject(:execute) { merge_request.rebase_async(user_id) }
+
+    it 'atomically enqueues a RebaseWorker job and updates rebase_jid' do
+      expect(RebaseWorker)
+        .to receive(:perform_async)
+        .with(merge_request.id, user_id)
+        .and_return(rebase_jid)
+
+      expect(merge_request).to receive(:lock!).and_call_original
+
+      execute
+
+      expect(merge_request.rebase_jid).to eq(rebase_jid)
+    end
+
+    it 'refuses to enqueue a job if a rebase is in progress' do
+      merge_request.update_column(:rebase_jid, rebase_jid)
+
+      expect(RebaseWorker).not_to receive(:perform_async)
+      expect(Gitlab::SidekiqStatus)
+        .to receive(:running?)
+        .with(rebase_jid)
+        .and_return(true)
+
+      expect { execute }.to raise_error(ActiveRecord::StaleObjectError)
+    end
+
+    it 'refuses to enqueue a job if the MR is not open' do
+      merge_request.update_column(:state, 'foo')
+
+      expect(RebaseWorker).not_to receive(:perform_async)
+
+      expect { execute }.to raise_error(ActiveRecord::StaleObjectError)
+    end
+  end
+
   describe '#mergeable?' do
     let(:project) { create(:project) }
 
@@ -2946,40 +2989,64 @@ describe MergeRequest do
   end
 
   describe '#rebase_in_progress?' do
-    shared_examples 'checking whether a rebase is in progress' do
-      let(:repo_path) do
-        Gitlab::GitalyClient::StorageSettings.allow_disk_access do
-          subject.source_project.repository.path
-        end
-      end
-      let(:rebase_path) { File.join(repo_path, "gitlab-worktree", "rebase-#{subject.id}") }
+    where(:rebase_jid, :jid_valid, :result) do
+      'foo' | true  | true
+      'foo' | false | false
+      ''    | true  | false
+      nil   | true  | false
+    end
 
-      before do
-        system(*%W(#{Gitlab.config.git.bin_path} -C #{repo_path} worktree add --detach #{rebase_path} master))
+    with_them do
+      let(:merge_request) { create(:merge_request) }
+
+      subject { merge_request.rebase_in_progress? }
+
+      it do
+        # Stub out the legacy gitaly implementation
+        allow(merge_request).to receive(:gitaly_rebase_in_progress?) { false }
+
+        allow(Gitlab::SidekiqStatus).to receive(:running?).with(rebase_jid) { jid_valid }
+
+        merge_request.rebase_jid = rebase_jid
+
+        is_expected.to eq(result)
       end
+    end
+  end
 
-      it 'returns true when there is a current rebase directory' do
-        expect(subject.rebase_in_progress?).to be_truthy
+  describe '#gitaly_rebase_in_progress?' do
+    let(:repo_path) do
+      Gitlab::GitalyClient::StorageSettings.allow_disk_access do
+        subject.source_project.repository.path
       end
+    end
+    let(:rebase_path) { File.join(repo_path, "gitlab-worktree", "rebase-#{subject.id}") }
 
-      it 'returns false when there is no rebase directory' do
-        FileUtils.rm_rf(rebase_path)
+    before do
+      system(*%W(#{Gitlab.config.git.bin_path} -C #{repo_path} worktree add --detach #{rebase_path} master))
+    end
 
-        expect(subject.rebase_in_progress?).to be_falsey
-      end
+    it 'returns true when there is a current rebase directory' do
+      expect(subject.rebase_in_progress?).to be_truthy
+    end
 
-      it 'returns false when the rebase directory has expired' do
-        time = 20.minutes.ago.to_time
-        File.utime(time, time, rebase_path)
+    it 'returns false when there is no rebase directory' do
+      FileUtils.rm_rf(rebase_path)
 
-        expect(subject.rebase_in_progress?).to be_falsey
-      end
+      expect(subject.rebase_in_progress?).to be_falsey
+    end
 
-      it 'returns false when the source project has been removed' do
-        allow(subject).to receive(:source_project).and_return(nil)
+    it 'returns false when the rebase directory has expired' do
+      time = 20.minutes.ago.to_time
+      File.utime(time, time, rebase_path)
 
-        expect(subject.rebase_in_progress?).to be_falsey
-      end
+      expect(subject.rebase_in_progress?).to be_falsey
+    end
+
+    it 'returns false when the source project has been removed' do
+      allow(subject).to receive(:source_project).and_return(nil)
+
+      expect(subject.rebase_in_progress?).to be_falsey
     end
   end
 
@@ -3153,4 +3220,34 @@ describe MergeRequest do
       it { is_expected.to be_truthy }
     end
   end
+
+  describe '#cleanup_refs' do
+    subject { merge_request.cleanup_refs(only: only) }
+
+    let(:merge_request) { build(:merge_request) }
+
+    context 'when removing all refs' do
+      let(:only) { :all }
+
+      it 'deletes all refs from the target project' do
+        expect(merge_request.target_project.repository)
+          .to receive(:delete_refs)
+          .with(merge_request.ref_path, merge_request.merge_ref_path, merge_request.train_ref_path)
+
+        subject
+      end
+    end
+
+    context 'when removing only train ref' do
+      let(:only) { :train }
+
+      it 'deletes train ref from the target project' do
+        expect(merge_request.target_project.repository)
+          .to receive(:delete_refs)
+          .with(merge_request.train_ref_path)
+
+        subject
+      end
+    end
+  end
 end
diff --git a/spec/models/namespace/aggregation_schedule_spec.rb b/spec/models/namespace/aggregation_schedule_spec.rb
index 8ed0248e1b2..0f1283717e0 100644
--- a/spec/models/namespace/aggregation_schedule_spec.rb
+++ b/spec/models/namespace/aggregation_schedule_spec.rb
@@ -53,10 +53,39 @@ RSpec.describe Namespace::AggregationSchedule, :clean_gitlab_redis_shared_state,
 
         expect(Namespaces::RootStatisticsWorker)
           .to receive(:perform_in).once
-          .with(described_class::DEFAULT_LEASE_TIMEOUT, aggregation_schedule.namespace_id )
+          .with(described_class::DEFAULT_LEASE_TIMEOUT, aggregation_schedule.namespace_id)
 
         aggregation_schedule.save!
       end
+
+      it 'does not release the lease' do
+        stub_exclusive_lease(lease_key, timeout: described_class::DEFAULT_LEASE_TIMEOUT)
+
+        aggregation_schedule.save!
+
+        exclusive_lease = aggregation_schedule.exclusive_lease
+        expect(exclusive_lease.exists?).to be_truthy
+      end
+
+      it 'only executes the workers once' do
+        # Avoid automatic deletion of Namespace::AggregationSchedule
+        # for testing purposes.
+        expect(Namespaces::RootStatisticsWorker)
+          .to receive(:perform_async).once
+          .and_return(nil)
+
+        expect(Namespaces::RootStatisticsWorker)
+          .to receive(:perform_in).once
+          .with(described_class::DEFAULT_LEASE_TIMEOUT, aggregation_schedule.namespace_id)
+          .and_return(nil)
+
+        # Scheduling workers for the first time
+        aggregation_schedule.schedule_root_storage_statistics
+
+        # Executing again, this time workers should not be scheduled
+        # due to the lease not been released.
+        aggregation_schedule.schedule_root_storage_statistics
+      end
     end
 
     context 'with a personalized lease timeout' do
diff --git a/spec/models/project_services/drone_ci_service_spec.rb b/spec/models/project_services/drone_ci_service_spec.rb
index 22df19d943f..a771d1bf27f 100644
--- a/spec/models/project_services/drone_ci_service_spec.rb
+++ b/spec/models/project_services/drone_ci_service_spec.rb
@@ -101,6 +101,15 @@ describe DroneCiService, :use_clean_rails_memory_store_caching do
         is_expected.to eq(:error)
       end
 
+      Gitlab::HTTP::HTTP_ERRORS.each do |http_error|
+        it "sets commit status to :error with a #{http_error.name} error" do
+          WebMock.stub_request(:get, commit_status_path)
+            .to_raise(http_error)
+
+          is_expected.to eq(:error)
+        end
+      end
+
       {
         "killed"  => :canceled,
         "failure" => :failed,
diff --git a/spec/models/project_services/kubernetes_service_spec.rb b/spec/models/project_services/kubernetes_service_spec.rb
index 5d7d6c34e67..d33bbb0470f 100644
--- a/spec/models/project_services/kubernetes_service_spec.rb
+++ b/spec/models/project_services/kubernetes_service_spec.rb
@@ -142,235 +142,6 @@ describe KubernetesService, :use_clean_rails_memory_store_caching do
     end
   end
 
-  describe '#kubernetes_namespace_for' do
-    subject { service.kubernetes_namespace_for(project) }
-
-    shared_examples 'a correctly formatted namespace' do
-      it 'returns a valid Kubernetes namespace name' do
-        expect(subject).to match(Gitlab::Regex.kubernetes_namespace_regex)
-        expect(subject).to eq(expected_namespace)
-      end
-    end
-
-    it_behaves_like 'a correctly formatted namespace' do
-      let(:expected_namespace) { service.send(:default_namespace) }
-    end
-
-    context 'when the project path contains forbidden characters' do
-      before do
-        project.path = '-a_Strange.Path--forSure'
-      end
-
-      it_behaves_like 'a correctly formatted namespace' do
-        let(:expected_namespace) { "a-strange-path--forsure-#{project.id}" }
-      end
-    end
-
-    context 'when namespace is specified' do
-      before do
-        service.namespace = 'my-namespace'
-      end
-
-      it_behaves_like 'a correctly formatted namespace' do
-        let(:expected_namespace) { 'my-namespace' }
-      end
-    end
-
-    context 'when service is not assigned to project' do
-      before do
-        service.project = nil
-      end
-
-      it 'does not return namespace' do
-        is_expected.to be_nil
-      end
-    end
-  end
-
-  describe '#test' do
-    let(:discovery_url) { 'https://kubernetes.example.com/api/v1' }
-
-    before do
-      stub_kubeclient_discover(service.api_url)
-    end
-
-    context 'with path prefix in api_url' do
-      let(:discovery_url) { 'https://kubernetes.example.com/prefix/api/v1' }
-
-      it 'tests with the prefix' do
-        service.api_url = 'https://kubernetes.example.com/prefix'
-        stub_kubeclient_discover(service.api_url)
-
-        expect(service.test[:success]).to be_truthy
-        expect(WebMock).to have_requested(:get, discovery_url).once
-      end
-    end
-
-    context 'with custom CA certificate' do
-      it 'is added to the certificate store' do
-        service.ca_pem = "CA PEM DATA"
-
-        cert = double("certificate")
-        expect(OpenSSL::X509::Certificate).to receive(:new).with(service.ca_pem).and_return(cert)
-        expect_any_instance_of(OpenSSL::X509::Store).to receive(:add_cert).with(cert)
-
-        expect(service.test[:success]).to be_truthy
-        expect(WebMock).to have_requested(:get, discovery_url).once
-      end
-    end
-
-    context 'success' do
-      it 'reads the discovery endpoint' do
-        expect(service.test[:success]).to be_truthy
-        expect(WebMock).to have_requested(:get, discovery_url).once
-      end
-    end
-
-    context 'failure' do
-      it 'fails to read the discovery endpoint' do
-        WebMock.stub_request(:get, service.api_url + '/api/v1').to_return(status: 404)
-
-        expect(service.test[:success]).to be_falsy
-        expect(WebMock).to have_requested(:get, discovery_url).once
-      end
-    end
-  end
-
-  describe '#predefined_variable' do
-    let(:kubeconfig) do
-      config_file = expand_fixture_path('config/kubeconfig.yml')
-      config = YAML.load(File.read(config_file))
-      config.dig('users', 0, 'user')['token'] = 'token'
-      config.dig('contexts', 0, 'context')['namespace'] = namespace
-      config.dig('clusters', 0, 'cluster')['certificate-authority-data'] =
-        Base64.strict_encode64('CA PEM DATA')
-
-      YAML.dump(config)
-    end
-
-    before do
-      subject.api_url = 'https://kube.domain.com'
-      subject.token = 'token'
-      subject.ca_pem = 'CA PEM DATA'
-      subject.project = project
-    end
-
-    shared_examples 'setting variables' do
-      it 'sets the variables' do
-        expect(subject.predefined_variables(project: project)).to include(
-          { key: 'KUBE_URL', value: 'https://kube.domain.com', public: true },
-          { key: 'KUBE_TOKEN', value: 'token', public: false, masked: true },
-          { key: 'KUBE_NAMESPACE', value: namespace, public: true },
-          { key: 'KUBECONFIG', value: kubeconfig, public: false, file: true },
-          { key: 'KUBE_CA_PEM', value: 'CA PEM DATA', public: true },
-          { key: 'KUBE_CA_PEM_FILE', value: 'CA PEM DATA', public: true, file: true }
-        )
-      end
-    end
-
-    context 'namespace is provided' do
-      let(:namespace) { 'my-project' }
-
-      before do
-        subject.namespace = namespace
-      end
-
-      it_behaves_like 'setting variables'
-    end
-
-    context 'no namespace provided' do
-      let(:namespace) { subject.kubernetes_namespace_for(project) }
-
-      it_behaves_like 'setting variables'
-
-      it 'sets the KUBE_NAMESPACE' do
-        kube_namespace = subject.predefined_variables(project: project).find { |h| h[:key] == 'KUBE_NAMESPACE' }
-
-        expect(kube_namespace).not_to be_nil
-        expect(kube_namespace[:value]).to match(/\A#{Gitlab::PathRegex::PATH_REGEX_STR}-\d+\z/)
-      end
-    end
-  end
-
-  describe '#terminals' do
-    let(:environment) { build(:environment, project: project, name: "env", slug: "env-000000") }
-
-    subject { service.terminals(environment) }
-
-    context 'with invalid pods' do
-      it 'returns no terminals' do
-        stub_reactive_cache(service, pods: [{ "bad" => "pod" }])
-
-        is_expected.to be_empty
-      end
-    end
-
-    context 'with valid pods' do
-      let(:pod) { kube_pod(environment_slug: environment.slug, namespace: service.kubernetes_namespace_for(project), project_slug: project.full_path_slug) }
-      let(:pod_with_no_terminal) { kube_pod(environment_slug: environment.slug, project_slug: project.full_path_slug, status: "Pending") }
-      let(:terminals) { kube_terminals(service, pod) }
-
-      before do
-        stub_reactive_cache(
-          service,
-          pods: [pod, pod, pod_with_no_terminal, kube_pod(environment_slug: "should-be-filtered-out")]
-        )
-      end
-
-      it 'returns terminals' do
-        is_expected.to eq(terminals + terminals)
-      end
-
-      it 'uses max session time from settings' do
-        stub_application_setting(terminal_max_session_time: 600)
-
-        times = subject.map { |terminal| terminal[:max_session_time] }
-        expect(times).to eq [600, 600, 600, 600]
-      end
-    end
-  end
-
-  describe '#calculate_reactive_cache' do
-    subject { service.calculate_reactive_cache }
-
-    let(:namespace) { service.kubernetes_namespace_for(project) }
-
-    context 'when service is inactive' do
-      before do
-        service.active = false
-      end
-
-      it { is_expected.to be_nil }
-    end
-
-    context 'when kubernetes responds with valid pods' do
-      before do
-        stub_kubeclient_pods(namespace)
-        stub_kubeclient_deployments(namespace) # Used by EE
-      end
-
-      it { is_expected.to include(pods: [kube_pod]) }
-    end
-
-    context 'when kubernetes responds with 500s' do
-      before do
-        stub_kubeclient_pods(namespace, status: 500)
-        stub_kubeclient_deployments(namespace, status: 500) # Used by EE
-      end
-
-      it { expect { subject }.to raise_error(Kubeclient::HttpError) }
-    end
-
-    context 'when kubernetes responds with 404s' do
-      before do
-        stub_kubeclient_pods(namespace, status: 404)
-        stub_kubeclient_deployments(namespace, status: 404) # Used by EE
-      end
-
-      it { is_expected.to include(pods: []) }
-    end
-  end
-
   describe "#deprecated?" do
     let(:kubernetes_service) { create(:kubernetes_service) }
 
diff --git a/spec/models/project_statistics_spec.rb b/spec/models/project_statistics_spec.rb
index 1cb49d83ffa..db3e4902c64 100644
--- a/spec/models/project_statistics_spec.rb
+++ b/spec/models/project_statistics_spec.rb
@@ -135,6 +135,49 @@ describe ProjectStatistics do
         expect(statistics.wiki_size).to eq(0)
       end
     end
+
+    context 'when the column is namespace relatable' do
+      let(:namespace) { create(:group) }
+      let(:project) { create(:project, namespace: namespace) }
+
+      context 'when the feature flag is off' do
+        it 'does not schedule the aggregation worker' do
+          stub_feature_flags(update_statistics_namespace: false, namespace: namespace)
+
+          expect(Namespaces::ScheduleAggregationWorker)
+            .not_to receive(:perform_async)
+
+          statistics.refresh!(only: [:lfs_objects_size])
+        end
+      end
+
+      context 'when the feature flag is on' do
+        it 'schedules the aggregation worker' do
+          expect(Namespaces::ScheduleAggregationWorker)
+            .to receive(:perform_async)
+
+          statistics.refresh!(only: [:lfs_objects_size])
+        end
+      end
+
+      context 'when no argument is passed' do
+        it 'schedules the aggregation worker' do
+          expect(Namespaces::ScheduleAggregationWorker)
+            .to receive(:perform_async)
+
+          statistics.refresh!
+        end
+      end
+    end
+
+    context 'when the column is not namespace relatable' do
+      it 'does not schedules an aggregation worker' do
+        expect(Namespaces::ScheduleAggregationWorker)
+          .not_to receive(:perform_async)
+
+        statistics.refresh!(only: [:commit_count])
+      end
+    end
   end
 
   describe '#update_commit_count' do
diff --git a/spec/models/repository_spec.rb b/spec/models/repository_spec.rb
index 13da7bd7407..3d967aa4ab8 100644
--- a/spec/models/repository_spec.rb
+++ b/spec/models/repository_spec.rb
@@ -1420,12 +1420,13 @@ describe Repository do
                              source_project: project)
     end
 
-    it 'writes merge of source and target to MR merge_ref_path' do
+    it 'writes merge of source SHA and first parent ref to MR merge_ref_path' do
       merge_commit_id = repository.merge_to_ref(user,
                                                 merge_request.diff_head_sha,
                                                 merge_request,
                                                 merge_request.merge_ref_path,
-                                                'Custom message')
+                                                'Custom message',
+                                                merge_request.target_branch_ref)
 
       merge_commit = repository.commit(merge_commit_id)
 
diff --git a/spec/requests/api/graphql_spec.rb b/spec/requests/api/graphql_spec.rb
index 656d6f8b50b..54401ec4085 100644
--- a/spec/requests/api/graphql_spec.rb
+++ b/spec/requests/api/graphql_spec.rb
@@ -6,16 +6,6 @@ describe 'GraphQL' do
 
   let(:query) { graphql_query_for('echo', 'text' => 'Hello world' ) }
 
-  context 'graphql is disabled by feature flag' do
-    before do
-      stub_feature_flags(graphql: false)
-    end
-
-    it 'does not generate a route for GraphQL' do
-      expect { post_graphql(query) }.to raise_error(ActionController::RoutingError)
-    end
-  end
-
   context 'logging' do
     shared_examples 'logging a graphql query' do
       let(:expected_params) do
@@ -131,4 +121,35 @@ describe 'GraphQL' do
       end
     end
   end
+
+  describe 'testing for Gitaly calls' do
+    let(:project) { create(:project, :repository) }
+    let(:user) { create(:user) }
+
+    let(:query) do
+      graphql_query_for('project', { 'fullPath' => project.full_path }, %w(id))
+    end
+
+    before do
+      project.add_developer(user)
+    end
+
+    it_behaves_like 'a working graphql query' do
+      before do
+        post_graphql(query, current_user: user)
+      end
+    end
+
+    context 'when Gitaly is called' do
+      before do
+        allow(Gitlab::GitalyClient).to receive(:get_request_count).and_return(1, 2)
+      end
+
+      it "logs a warning that the 'calls_gitaly' field declaration is missing" do
+        expect(Gitlab::Sentry).to receive(:track_exception).once
+
+        post_graphql(query, current_user: user)
+      end
+    end
+  end
 end
diff --git a/spec/requests/api/merge_requests_spec.rb b/spec/requests/api/merge_requests_spec.rb
index a82ecb4fd63..ced853caab4 100644
--- a/spec/requests/api/merge_requests_spec.rb
+++ b/spec/requests/api/merge_requests_spec.rb
@@ -2033,6 +2033,9 @@ describe API::MergeRequests do
 
       expect(response).to have_gitlab_http_status(202)
       expect(RebaseWorker.jobs.size).to eq(1)
+
+      expect(merge_request.reload).to be_rebase_in_progress
+      expect(json_response['rebase_in_progress']).to be(true)
     end
 
     it 'returns 403 if the user cannot push to the branch' do
@@ -2043,6 +2046,16 @@ describe API::MergeRequests do
 
       expect(response).to have_gitlab_http_status(403)
     end
+
+    it 'returns 409 if a rebase is already in progress' do
+      Sidekiq::Testing.fake! do
+        merge_request.rebase_async(user.id)
+
+        put api("/projects/#{project.id}/merge_requests/#{merge_request.iid}/rebase", user)
+      end
+
+      expect(response).to have_gitlab_http_status(409)
+    end
   end
 
   describe 'Time tracking' do
diff --git a/spec/requests/api/projects_spec.rb b/spec/requests/api/projects_spec.rb
index df4758f362b..a2aae257352 100644
--- a/spec/requests/api/projects_spec.rb
+++ b/spec/requests/api/projects_spec.rb
@@ -2482,7 +2482,7 @@ describe API::Projects do
     let(:housekeeping) { Projects::HousekeepingService.new(project) }
 
     before do
-      allow(Projects::HousekeepingService).to receive(:new).with(project).and_return(housekeeping)
+      allow(Projects::HousekeepingService).to receive(:new).with(project, :gc).and_return(housekeeping)
     end
 
     context 'when authenticated as owner' do
diff --git a/spec/requests/api/runners_spec.rb b/spec/requests/api/runners_spec.rb
index 5548e3fd01a..f5ce3a3570e 100644
--- a/spec/requests/api/runners_spec.rb
+++ b/spec/requests/api/runners_spec.rb
@@ -584,6 +584,34 @@ describe API::Runners do
           end
         end
 
+        context 'when valid order_by is provided' do
+          context 'when sort order is not specified' do
+            it 'return jobs in descending order' do
+              get api("/runners/#{project_runner.id}/jobs?order_by=id", admin)
+
+              expect(response).to have_gitlab_http_status(200)
+              expect(response).to include_pagination_headers
+
+              expect(json_response).to be_an(Array)
+              expect(json_response.length).to eq(2)
+              expect(json_response.first).to include('id' => job_5.id)
+            end
+          end
+
+          context 'when sort order is specified as asc' do
+            it 'return jobs sorted in ascending order' do
+              get api("/runners/#{project_runner.id}/jobs?order_by=id&sort=asc", admin)
+
+              expect(response).to have_gitlab_http_status(200)
+              expect(response).to include_pagination_headers
+
+              expect(json_response).to be_an(Array)
+              expect(json_response.length).to eq(2)
+              expect(json_response.first).to include('id' => job_4.id)
+            end
+          end
+        end
+
         context 'when invalid status is provided' do
           it 'return 400' do
             get api("/runners/#{project_runner.id}/jobs?status=non-existing", admin)
@@ -591,6 +619,22 @@ describe API::Runners do
             expect(response).to have_gitlab_http_status(400)
           end
         end
+
+        context 'when invalid order_by is provided' do
+          it 'return 400' do
+            get api("/runners/#{project_runner.id}/jobs?order_by=non-existing", admin)
+
+            expect(response).to have_gitlab_http_status(400)
+          end
+        end
+
+        context 'when invalid sort is provided' do
+          it 'return 400' do
+            get api("/runners/#{project_runner.id}/jobs?sort=non-existing", admin)
+
+            expect(response).to have_gitlab_http_status(400)
+          end
+        end
       end
 
       context "when runner doesn't exist" do
diff --git a/spec/requests/api/user_counts_spec.rb b/spec/requests/api/user_counts_spec.rb
new file mode 100644
index 00000000000..c833bd047e2
--- /dev/null
+++ b/spec/requests/api/user_counts_spec.rb
@@ -0,0 +1,40 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe API::UserCounts do
+  let(:user) { create(:user) }
+  let(:project) { create(:project, :public) }
+
+  let!(:merge_request) { create(:merge_request, :simple, author: user, assignees: [user], source_project: project, title: "Test") }
+
+  describe 'GET /user_counts' do
+    context 'when unauthenticated' do
+      it 'returns authentication error' do
+        get api('/user_counts')
+
+        expect(response.status).to eq(401)
+      end
+    end
+
+    context 'when authenticated' do
+      it 'returns open counts for current user' do
+        get api('/user_counts', user)
+
+        expect(response.status).to eq(200)
+        expect(json_response).to be_a Hash
+        expect(json_response['merge_requests']).to eq(1)
+      end
+
+      it 'updates the mr count when a new mr is assigned' do
+        create(:merge_request, source_project: project, author: user, assignees: [user])
+
+        get api('/user_counts', user)
+
+        expect(response.status).to eq(200)
+        expect(json_response).to be_a Hash
+        expect(json_response['merge_requests']).to eq(2)
+      end
+    end
+  end
+end
diff --git a/spec/routing/api_routing_spec.rb b/spec/routing/api_routing_spec.rb
deleted file mode 100644
index 3c48ead4ff2..00000000000
--- a/spec/routing/api_routing_spec.rb
+++ /dev/null
@@ -1,23 +0,0 @@
-require 'spec_helper'
-
-describe 'api', 'routing' do
-  context 'when graphql is disabled' do
-    before do
-      stub_feature_flags(graphql: false)
-    end
-
-    it 'does not route to the GraphqlController' do
-      expect(post('/api/graphql')).not_to route_to('graphql#execute')
-    end
-  end
-
-  context 'when graphql is enabled' do
-    before do
-      stub_feature_flags(graphql: true)
-    end
-
-    it 'routes to the GraphqlController' do
-      expect(post('/api/graphql')).to route_to('graphql#execute')
-    end
-  end
-end
diff --git a/spec/serializers/environment_status_entity_spec.rb b/spec/serializers/environment_status_entity_spec.rb
index 8a6a38fe5f8..f421432e8d6 100644
--- a/spec/serializers/environment_status_entity_spec.rb
+++ b/spec/serializers/environment_status_entity_spec.rb
@@ -9,7 +9,7 @@ describe EnvironmentStatusEntity do
   let(:project)       { deployment.project }
   let(:merge_request) { create(:merge_request, :deployed_review_app, deployment: deployment) }
 
-  let(:environment_status) { EnvironmentStatus.new(environment, merge_request, merge_request.diff_head_sha) }
+  let(:environment_status) { EnvironmentStatus.new(project, environment, merge_request, merge_request.diff_head_sha) }
   let(:entity)             { described_class.new(environment_status, request: request) }
 
   subject { entity.as_json }
@@ -55,8 +55,14 @@ describe EnvironmentStatusEntity do
     before do
       project.add_maintainer(user)
       allow(deployment).to receive(:prometheus_adapter).and_return(prometheus_adapter)
-      allow(prometheus_adapter).to receive(:query).with(:deployment, deployment).and_return(simple_metrics)
       allow(entity).to receive(:deployment).and_return(deployment)
+
+      expect_next_instance_of(DeploymentMetrics) do |deployment_metrics|
+        allow(deployment_metrics).to receive(:prometheus_adapter).and_return(prometheus_adapter)
+
+        allow(prometheus_adapter).to receive(:query)
+          .with(:deployment, deployment).and_return(simple_metrics)
+      end
     end
 
     context 'when deployment succeeded' do
diff --git a/spec/serializers/test_case_entity_spec.rb b/spec/serializers/test_case_entity_spec.rb
index 986c9feb07b..cc5f086ca4e 100644
--- a/spec/serializers/test_case_entity_spec.rb
+++ b/spec/serializers/test_case_entity_spec.rb
@@ -24,7 +24,7 @@ describe TestCaseEntity do
 
       it 'contains correct test case details' do
         expect(subject[:status]).to eq('failed')
-        expect(subject[:name]).to eq('Test#sum when a is 2 and b is 2 returns summary')
+        expect(subject[:name]).to eq('Test#sum when a is 1 and b is 3 returns summary')
         expect(subject[:classname]).to eq('spec.test_spec')
         expect(subject[:execution_time]).to eq(2.22)
       end
diff --git a/spec/serializers/test_reports_comparer_entity_spec.rb b/spec/serializers/test_reports_comparer_entity_spec.rb
index 59c058fe368..4a951bbbde4 100644
--- a/spec/serializers/test_reports_comparer_entity_spec.rb
+++ b/spec/serializers/test_reports_comparer_entity_spec.rb
@@ -53,13 +53,7 @@ describe TestReportsComparerEntity do
           base_reports.get_suite('rspec').add_test_case(create_test_case_rspec_success)
           base_reports.get_suite('junit').add_test_case(create_test_case_java_failed)
           head_reports.get_suite('rspec').add_test_case(create_test_case_rspec_success)
-          head_reports.get_suite('junit').add_test_case(create_test_case_java_resolved)
-        end
-
-        let(:create_test_case_java_resolved) do
-          create_test_case_java_failed.tap do |test_case|
-            test_case.instance_variable_set("@status", Gitlab::Ci::Reports::TestCase::STATUS_SUCCESS)
-          end
+          head_reports.get_suite('junit').add_test_case(create_test_case_java_success)
         end
 
         it 'contains correct compared test reports details' do
diff --git a/spec/serializers/test_reports_comparer_serializer_spec.rb b/spec/serializers/test_reports_comparer_serializer_spec.rb
index 9ea86c0dd83..62dc6f486c5 100644
--- a/spec/serializers/test_reports_comparer_serializer_spec.rb
+++ b/spec/serializers/test_reports_comparer_serializer_spec.rb
@@ -44,13 +44,7 @@ describe TestReportsComparerSerializer do
           base_reports.get_suite('rspec').add_test_case(create_test_case_rspec_success)
           base_reports.get_suite('junit').add_test_case(create_test_case_java_failed)
           head_reports.get_suite('rspec').add_test_case(create_test_case_rspec_success)
-          head_reports.get_suite('junit').add_test_case(create_test_case_java_resolved)
-        end
-
-        let(:create_test_case_java_resolved) do
-          create_test_case_java_failed.tap do |test_case|
-            test_case.instance_variable_set("@status", Gitlab::Ci::Reports::TestCase::STATUS_SUCCESS)
-          end
+          head_reports.get_suite('junit').add_test_case(create_test_case_java_success)
         end
 
         it 'matches the schema' do
diff --git a/spec/serializers/test_suite_comparer_entity_spec.rb b/spec/serializers/test_suite_comparer_entity_spec.rb
index f61331f53a0..4b2cca2c68c 100644
--- a/spec/serializers/test_suite_comparer_entity_spec.rb
+++ b/spec/serializers/test_suite_comparer_entity_spec.rb
@@ -11,16 +11,10 @@ describe TestSuiteComparerEntity do
   let(:test_case_success) { create_test_case_rspec_success }
   let(:test_case_failed) { create_test_case_rspec_failed }
 
-  let(:test_case_resolved) do
-    create_test_case_rspec_failed.tap do |test_case|
-      test_case.instance_variable_set("@status", Gitlab::Ci::Reports::TestCase::STATUS_SUCCESS)
-    end
-  end
-
   describe '#as_json' do
     subject { entity.as_json }
 
-    context 'when head sutie has a newly failed test case which does not exist in base' do
+    context 'when head suite has a newly failed test case which does not exist in base' do
       before do
         base_suite.add_test_case(test_case_success)
         head_suite.add_test_case(test_case_failed)
@@ -41,7 +35,7 @@ describe TestSuiteComparerEntity do
       end
     end
 
-    context 'when head sutie still has a failed test case which failed in base' do
+    context 'when head suite still has a failed test case which failed in base' do
       before do
         base_suite.add_test_case(test_case_failed)
         head_suite.add_test_case(test_case_failed)
@@ -62,10 +56,10 @@ describe TestSuiteComparerEntity do
       end
     end
 
-    context 'when head sutie has a success test case which failed in base' do
+    context 'when head suite has a success test case which failed in base' do
       before do
         base_suite.add_test_case(test_case_failed)
-        head_suite.add_test_case(test_case_resolved)
+        head_suite.add_test_case(test_case_success)
       end
 
       it 'contains correct compared test suite details' do
@@ -74,13 +68,83 @@ describe TestSuiteComparerEntity do
         expect(subject[:summary]).to include(total: 1, resolved: 1, failed: 0)
         expect(subject[:new_failures]).to be_empty
         subject[:resolved_failures].first.tap do |resolved_failure|
-          expect(resolved_failure[:status]).to eq(test_case_resolved.status)
-          expect(resolved_failure[:name]).to eq(test_case_resolved.name)
-          expect(resolved_failure[:execution_time]).to eq(test_case_resolved.execution_time)
-          expect(resolved_failure[:system_output]).to eq(test_case_resolved.system_output)
+          expect(resolved_failure[:status]).to eq(test_case_success.status)
+          expect(resolved_failure[:name]).to eq(test_case_success.name)
+          expect(resolved_failure[:execution_time]).to eq(test_case_success.execution_time)
+          expect(resolved_failure[:system_output]).to eq(test_case_success.system_output)
         end
         expect(subject[:existing_failures]).to be_empty
       end
     end
+
+    context 'limits amount of tests returned' do
+      before do
+        stub_const('TestSuiteComparerEntity::DEFAULT_MAX_TESTS', 2)
+        stub_const('TestSuiteComparerEntity::DEFAULT_MIN_TESTS', 1)
+      end
+
+      context 'prefers new over existing and resolved' do
+        before do
+          3.times { add_new_failure }
+          3.times { add_existing_failure }
+          3.times { add_resolved_failure }
+        end
+
+        it 'returns 2 new failures, and 1 of resolved and existing' do
+          expect(subject[:summary]).to include(total: 9, resolved: 3, failed: 6)
+          expect(subject[:new_failures].count).to eq(2)
+          expect(subject[:existing_failures].count).to eq(1)
+          expect(subject[:resolved_failures].count).to eq(1)
+        end
+      end
+
+      context 'prefers existing over resolved' do
+        before do
+          3.times { add_existing_failure }
+          3.times { add_resolved_failure }
+        end
+
+        it 'returns 2 existing failures, and 1 resolved' do
+          expect(subject[:summary]).to include(total: 6, resolved: 3, failed: 3)
+          expect(subject[:new_failures].count).to eq(0)
+          expect(subject[:existing_failures].count).to eq(2)
+          expect(subject[:resolved_failures].count).to eq(1)
+        end
+      end
+
+      context 'limits amount of resolved' do
+        before do
+          3.times { add_resolved_failure }
+        end
+
+        it 'returns 2 resolved failures' do
+          expect(subject[:summary]).to include(total: 3, resolved: 3, failed: 0)
+          expect(subject[:new_failures].count).to eq(0)
+          expect(subject[:existing_failures].count).to eq(0)
+          expect(subject[:resolved_failures].count).to eq(2)
+        end
+      end
+
+      private
+
+      def add_new_failure
+        failed_case = create_test_case_rspec_failed(SecureRandom.hex)
+        head_suite.add_test_case(failed_case)
+      end
+
+      def add_existing_failure
+        failed_case = create_test_case_rspec_failed(SecureRandom.hex)
+        base_suite.add_test_case(failed_case)
+        head_suite.add_test_case(failed_case)
+      end
+
+      def add_resolved_failure
+        case_name = SecureRandom.hex
+        failed_case = create_test_case_rspec_failed(case_name)
+        success_case = create_test_case_rspec_success(case_name)
+        base_suite.add_test_case(failed_case)
+        head_suite.add_test_case(success_case)
+      end
+    end
   end
 end
diff --git a/spec/services/auto_merge/base_service_spec.rb b/spec/services/auto_merge/base_service_spec.rb
index cd08e0b6f32..a409f21a7e4 100644
--- a/spec/services/auto_merge/base_service_spec.rb
+++ b/spec/services/auto_merge/base_service_spec.rb
@@ -59,6 +59,11 @@ describe AutoMerge::BaseService do
     context 'when strategy is merge when pipeline succeeds' do
       let(:service) { AutoMerge::MergeWhenPipelineSucceedsService.new(project, user) }
 
+      before do
+        pipeline = build(:ci_pipeline)
+        allow(merge_request).to receive(:actual_head_pipeline) { pipeline }
+      end
+
       it 'sets the auto merge strategy' do
         subject
 
@@ -116,11 +121,7 @@ describe AutoMerge::BaseService do
     end
   end
 
-  describe '#cancel' do
-    subject { service.cancel(merge_request) }
-
-    let(:merge_request) { create(:merge_request, :merge_when_pipeline_succeeds) }
-
+  shared_examples_for 'Canceled or Dropped' do
     it 'removes properies from the merge request' do
       subject
 
@@ -168,6 +169,20 @@ describe AutoMerge::BaseService do
       it 'does not yield block' do
         expect { |b| service.execute(merge_request, &b) }.not_to yield_control
       end
+    end
+  end
+
+  describe '#cancel' do
+    subject { service.cancel(merge_request) }
+
+    let(:merge_request) { create(:merge_request, :merge_when_pipeline_succeeds) }
+
+    it_behaves_like 'Canceled or Dropped'
+
+    context 'when failed to save' do
+      before do
+        allow(merge_request).to receive(:save) { false }
+      end
 
       it 'returns error status' do
         expect(subject[:status]).to eq(:error)
@@ -175,4 +190,24 @@ describe AutoMerge::BaseService do
       end
     end
   end
+
+  describe '#abort' do
+    subject { service.abort(merge_request, reason) }
+
+    let(:merge_request) { create(:merge_request, :merge_when_pipeline_succeeds) }
+    let(:reason) { 'an error'}
+
+    it_behaves_like 'Canceled or Dropped'
+
+    context 'when failed to save' do
+      before do
+        allow(merge_request).to receive(:save) { false }
+      end
+
+      it 'returns error status' do
+        expect(subject[:status]).to eq(:error)
+        expect(subject[:message]).to eq("Can't abort the automatic merge")
+      end
+    end
+  end
 end
diff --git a/spec/services/auto_merge/merge_when_pipeline_succeeds_service_spec.rb b/spec/services/auto_merge/merge_when_pipeline_succeeds_service_spec.rb
index a20bf8e17e4..931b52470c4 100644
--- a/spec/services/auto_merge/merge_when_pipeline_succeeds_service_spec.rb
+++ b/spec/services/auto_merge/merge_when_pipeline_succeeds_service_spec.rb
@@ -64,8 +64,11 @@ describe AutoMerge::MergeWhenPipelineSucceedsService do
       end
 
       it 'creates a system note' do
+        pipeline = build(:ci_pipeline)
+        allow(merge_request).to receive(:actual_head_pipeline) { pipeline }
+
         note = merge_request.notes.last
-        expect(note.note).to match %r{enabled an automatic merge when the pipeline for (\w+/\w+@)?\h{8}}
+        expect(note.note).to match "enabled an automatic merge when the pipeline for #{pipeline.sha}"
       end
     end
 
@@ -174,6 +177,17 @@ describe AutoMerge::MergeWhenPipelineSucceedsService do
     end
   end
 
+  describe "#abort" do
+    before do
+      service.abort(mr_merge_if_green_enabled, 'an error')
+    end
+
+    it 'posts a system note' do
+      note = mr_merge_if_green_enabled.notes.last
+      expect(note.note).to include 'aborted the automatic merge'
+    end
+  end
+
   describe 'pipeline integration' do
     context 'when there are multiple stages in the pipeline' do
       let(:ref) { mr_merge_if_green_enabled.source_branch }
diff --git a/spec/services/auto_merge_service_spec.rb b/spec/services/auto_merge_service_spec.rb
index 93a22e60498..50dfc49a59c 100644
--- a/spec/services/auto_merge_service_spec.rb
+++ b/spec/services/auto_merge_service_spec.rb
@@ -161,4 +161,29 @@ describe AutoMergeService do
       end
     end
   end
+
+  describe '#abort' do
+    subject { service.abort(merge_request, error) }
+
+    let(:merge_request) { create(:merge_request, :merge_when_pipeline_succeeds) }
+    let(:error) { 'an error' }
+
+    it 'delegates to a relevant service instance' do
+      expect_next_instance_of(AutoMerge::MergeWhenPipelineSucceedsService) do |service|
+        expect(service).to receive(:abort).with(merge_request, error)
+      end
+
+      subject
+    end
+
+    context 'when auto merge is not enabled' do
+      let(:merge_request) { create(:merge_request) }
+
+      it 'returns error' do
+        expect(subject[:message]).to eq("Can't abort the automatic merge")
+        expect(subject[:status]).to eq(:error)
+        expect(subject[:http_status]).to eq(406)
+      end
+    end
+  end
 end
diff --git a/spec/services/issuable/bulk_update_service_spec.rb b/spec/services/issuable/bulk_update_service_spec.rb
index aebc5ba2874..3d2d4b5f216 100644
--- a/spec/services/issuable/bulk_update_service_spec.rb
+++ b/spec/services/issuable/bulk_update_service_spec.rb
@@ -11,343 +11,371 @@ describe Issuable::BulkUpdateService do
       .reverse_merge(issuable_ids: Array(issuables).map(&:id).join(','))
 
     type = Array(issuables).first.model_name.param_key
-    Issuable::BulkUpdateService.new(project, user, bulk_update_params).execute(type)
+    Issuable::BulkUpdateService.new(user, bulk_update_params).execute(type)
   end
 
-  describe 'close issues' do
-    let(:issues) { create_list(:issue, 2, project: project) }
-
-    it 'succeeds and returns the correct number of issues updated' do
-      result = bulk_update(issues, state_event: 'close')
+  shared_examples 'updates milestones' do
+    it 'succeeds' do
+      result = bulk_update(issues, milestone_id: milestone.id)
 
       expect(result[:success]).to be_truthy
       expect(result[:count]).to eq(issues.count)
     end
 
-    it 'closes all the issues passed' do
-      bulk_update(issues, state_event: 'close')
+    it 'updates the issues milestone' do
+      bulk_update(issues, milestone_id: milestone.id)
 
-      expect(project.issues.opened).to be_empty
-      expect(project.issues.closed).not_to be_empty
+      issues.each do |issue|
+        expect(issue.reload.milestone).to eq(milestone)
+      end
     end
+  end
 
-    context 'when issue for a different project is created' do
-      let(:private_project) { create(:project, :private) }
-      let(:issue) { create(:issue, project: private_project, author: user) }
+  context 'with project issues' do
+    describe 'close issues' do
+      let(:issues) { create_list(:issue, 2, project: project) }
 
-      context 'when user has access to the project' do
-        it 'closes all issues passed' do
-          private_project.add_maintainer(user)
+      it 'succeeds and returns the correct number of issues updated' do
+        result = bulk_update(issues, state_event: 'close')
 
-          bulk_update(issues + [issue], state_event: 'close')
+        expect(result[:success]).to be_truthy
+        expect(result[:count]).to eq(issues.count)
+      end
 
-          expect(project.issues.opened).to be_empty
-          expect(project.issues.closed).not_to be_empty
-          expect(private_project.issues.closed).not_to be_empty
-        end
+      it 'closes all the issues passed' do
+        bulk_update(issues, state_event: 'close')
+
+        expect(project.issues.opened).to be_empty
+        expect(project.issues.closed).not_to be_empty
       end
 
-      context 'when user does not have access to project' do
-        it 'only closes all issues that the user has access to' do
-          bulk_update(issues + [issue], state_event: 'close')
+      context 'when issue for a different project is created' do
+        let(:private_project) { create(:project, :private) }
+        let(:issue) { create(:issue, project: private_project, author: user) }
+
+        context 'when user has access to the project' do
+          it 'closes all issues passed' do
+            private_project.add_maintainer(user)
+
+            bulk_update(issues + [issue], state_event: 'close')
+
+            expect(project.issues.opened).to be_empty
+            expect(project.issues.closed).not_to be_empty
+            expect(private_project.issues.closed).not_to be_empty
+          end
+        end
+
+        context 'when user does not have access to project' do
+          it 'only closes all issues that the user has access to' do
+            bulk_update(issues + [issue], state_event: 'close')
 
-          expect(project.issues.opened).to be_empty
-          expect(project.issues.closed).not_to be_empty
-          expect(private_project.issues.closed).to be_empty
+            expect(project.issues.opened).to be_empty
+            expect(project.issues.closed).not_to be_empty
+            expect(private_project.issues.closed).to be_empty
+          end
         end
       end
     end
-  end
 
-  describe 'reopen issues' do
-    let(:issues) { create_list(:closed_issue, 2, project: project) }
+    describe 'reopen issues' do
+      let(:issues) { create_list(:closed_issue, 2, project: project) }
 
-    it 'succeeds and returns the correct number of issues updated' do
-      result = bulk_update(issues, state_event: 'reopen')
+      it 'succeeds and returns the correct number of issues updated' do
+        result = bulk_update(issues, state_event: 'reopen')
 
-      expect(result[:success]).to be_truthy
-      expect(result[:count]).to eq(issues.count)
-    end
+        expect(result[:success]).to be_truthy
+        expect(result[:count]).to eq(issues.count)
+      end
 
-    it 'reopens all the issues passed' do
-      bulk_update(issues, state_event: 'reopen')
+      it 'reopens all the issues passed' do
+        bulk_update(issues, state_event: 'reopen')
 
-      expect(project.issues.closed).to be_empty
-      expect(project.issues.opened).not_to be_empty
+        expect(project.issues.closed).to be_empty
+        expect(project.issues.opened).not_to be_empty
+      end
     end
-  end
 
-  describe 'updating merge request assignee' do
-    let(:merge_request) { create(:merge_request, target_project: project, source_project: project, assignees: [user]) }
+    describe 'updating merge request assignee' do
+      let(:merge_request) { create(:merge_request, target_project: project, source_project: project, assignees: [user]) }
 
-    context 'when the new assignee ID is a valid user' do
-      it 'succeeds' do
-        new_assignee = create(:user)
-        project.add_developer(new_assignee)
+      context 'when the new assignee ID is a valid user' do
+        it 'succeeds' do
+          new_assignee = create(:user)
+          project.add_developer(new_assignee)
 
-        result = bulk_update(merge_request, assignee_ids: [user.id, new_assignee.id])
+          result = bulk_update(merge_request, assignee_ids: [user.id, new_assignee.id])
 
-        expect(result[:success]).to be_truthy
-        expect(result[:count]).to eq(1)
-      end
+          expect(result[:success]).to be_truthy
+          expect(result[:count]).to eq(1)
+        end
 
-      it 'updates the assignee to the user ID passed' do
-        assignee = create(:user)
-        project.add_developer(assignee)
+        it 'updates the assignee to the user ID passed' do
+          assignee = create(:user)
+          project.add_developer(assignee)
 
-        expect { bulk_update(merge_request, assignee_ids: [assignee.id]) }
-          .to change { merge_request.reload.assignee_ids }.from([user.id]).to([assignee.id])
+          expect { bulk_update(merge_request, assignee_ids: [assignee.id]) }
+            .to change { merge_request.reload.assignee_ids }.from([user.id]).to([assignee.id])
+        end
       end
-    end
 
-    context "when the new assignee ID is #{IssuableFinder::NONE}" do
-      it 'unassigns the issues' do
-        expect { bulk_update(merge_request, assignee_ids: [IssuableFinder::NONE]) }
-          .to change { merge_request.reload.assignee_ids }.to([])
+      context "when the new assignee ID is #{IssuableFinder::NONE}" do
+        it 'unassigns the issues' do
+          expect { bulk_update(merge_request, assignee_ids: [IssuableFinder::NONE]) }
+            .to change { merge_request.reload.assignee_ids }.to([])
+        end
       end
-    end
 
-    context 'when the new assignee ID is not present' do
-      it 'does not unassign' do
-        expect { bulk_update(merge_request, assignee_ids: []) }
-          .not_to change { merge_request.reload.assignee_ids }
+      context 'when the new assignee ID is not present' do
+        it 'does not unassign' do
+          expect { bulk_update(merge_request, assignee_ids: []) }
+            .not_to change { merge_request.reload.assignee_ids }
+        end
       end
     end
-  end
 
-  describe 'updating issue assignee' do
-    let(:issue) { create(:issue, project: project, assignees: [user]) }
+    describe 'updating issue assignee' do
+      let(:issue) { create(:issue, project: project, assignees: [user]) }
 
-    context 'when the new assignee ID is a valid user' do
-      it 'succeeds' do
-        new_assignee = create(:user)
-        project.add_developer(new_assignee)
+      context 'when the new assignee ID is a valid user' do
+        it 'succeeds' do
+          new_assignee = create(:user)
+          project.add_developer(new_assignee)
 
-        result = bulk_update(issue, assignee_ids: [new_assignee.id])
+          result = bulk_update(issue, assignee_ids: [new_assignee.id])
 
-        expect(result[:success]).to be_truthy
-        expect(result[:count]).to eq(1)
-      end
+          expect(result[:success]).to be_truthy
+          expect(result[:count]).to eq(1)
+        end
 
-      it 'updates the assignee to the user ID passed' do
-        assignee = create(:user)
-        project.add_developer(assignee)
-        expect { bulk_update(issue, assignee_ids: [assignee.id]) }
-          .to change { issue.reload.assignees.first }.from(user).to(assignee)
+        it 'updates the assignee to the user ID passed' do
+          assignee = create(:user)
+          project.add_developer(assignee)
+          expect { bulk_update(issue, assignee_ids: [assignee.id]) }
+            .to change { issue.reload.assignees.first }.from(user).to(assignee)
+        end
       end
-    end
 
-    context "when the new assignee ID is #{IssuableFinder::NONE}" do
-      it "unassigns the issues" do
-        expect { bulk_update(issue, assignee_ids: [IssuableFinder::NONE.to_s]) }
-          .to change { issue.reload.assignees.count }.from(1).to(0)
+      context "when the new assignee ID is #{IssuableFinder::NONE}" do
+        it "unassigns the issues" do
+          expect { bulk_update(issue, assignee_ids: [IssuableFinder::NONE.to_s]) }
+            .to change { issue.reload.assignees.count }.from(1).to(0)
+        end
       end
-    end
 
-    context 'when the new assignee ID is not present' do
-      it 'does not unassign' do
-        expect { bulk_update(issue, assignee_ids: []) }
-          .not_to change { issue.reload.assignees }
+      context 'when the new assignee ID is not present' do
+        it 'does not unassign' do
+          expect { bulk_update(issue, assignee_ids: []) }
+            .not_to change { issue.reload.assignees }
+        end
       end
     end
-  end
-
-  describe 'updating milestones' do
-    let(:issue)     { create(:issue, project: project) }
-    let(:milestone) { create(:milestone, project: project) }
 
-    it 'succeeds' do
-      result = bulk_update(issue, milestone_id: milestone.id)
+    describe 'updating milestones' do
+      let(:issues)    { [create(:issue, project: project)] }
+      let(:milestone) { create(:milestone, project: project) }
 
-      expect(result[:success]).to be_truthy
-      expect(result[:count]).to eq(1)
+      it_behaves_like 'updates milestones'
     end
 
-    it 'updates the issue milestone' do
-      expect { bulk_update(issue, milestone_id: milestone.id) }
-        .to change { issue.reload.milestone }.from(nil).to(milestone)
-    end
-  end
-
-  describe 'updating labels' do
-    def create_issue_with_labels(labels)
-      create(:labeled_issue, project: project, labels: labels)
-    end
+    describe 'updating labels' do
+      def create_issue_with_labels(labels)
+        create(:labeled_issue, project: project, labels: labels)
+      end
 
-    let(:bug) { create(:label, project: project) }
-    let(:regression) { create(:label, project: project) }
-    let(:merge_requests) { create(:label, project: project) }
-
-    let(:issue_all_labels) { create_issue_with_labels([bug, regression, merge_requests]) }
-    let(:issue_bug_and_regression) { create_issue_with_labels([bug, regression]) }
-    let(:issue_bug_and_merge_requests) { create_issue_with_labels([bug, merge_requests]) }
-    let(:issue_no_labels) { create(:issue, project: project) }
-    let(:issues) { [issue_all_labels, issue_bug_and_regression, issue_bug_and_merge_requests, issue_no_labels] }
-
-    let(:labels) { [] }
-    let(:add_labels) { [] }
-    let(:remove_labels) { [] }
-
-    let(:bulk_update_params) do
-      {
-        label_ids:        labels.map(&:id),
-        add_label_ids:    add_labels.map(&:id),
-        remove_label_ids: remove_labels.map(&:id)
-      }
-    end
+      let(:bug) { create(:label, project: project) }
+      let(:regression) { create(:label, project: project) }
+      let(:merge_requests) { create(:label, project: project) }
 
-    before do
-      bulk_update(issues, bulk_update_params)
-    end
+      let(:issue_all_labels) { create_issue_with_labels([bug, regression, merge_requests]) }
+      let(:issue_bug_and_regression) { create_issue_with_labels([bug, regression]) }
+      let(:issue_bug_and_merge_requests) { create_issue_with_labels([bug, merge_requests]) }
+      let(:issue_no_labels) { create(:issue, project: project) }
+      let(:issues) { [issue_all_labels, issue_bug_and_regression, issue_bug_and_merge_requests, issue_no_labels] }
 
-    context 'when label_ids are passed' do
-      let(:issues) { [issue_all_labels, issue_no_labels] }
-      let(:labels) { [bug, regression] }
+      let(:labels) { [] }
+      let(:add_labels) { [] }
+      let(:remove_labels) { [] }
 
-      it 'updates the labels of all issues passed to the labels passed' do
-        expect(issues.map(&:reload).map(&:label_ids)).to all(match_array(labels.map(&:id)))
+      let(:bulk_update_params) do
+        {
+          label_ids:        labels.map(&:id),
+          add_label_ids:    add_labels.map(&:id),
+          remove_label_ids: remove_labels.map(&:id)
+        }
       end
 
-      it 'does not update issues not passed in' do
-        expect(issue_bug_and_regression.label_ids).to contain_exactly(bug.id, regression.id)
+      before do
+        bulk_update(issues, bulk_update_params)
       end
 
-      context 'when those label IDs are empty' do
-        let(:labels) { [] }
+      context 'when label_ids are passed' do
+        let(:issues) { [issue_all_labels, issue_no_labels] }
+        let(:labels) { [bug, regression] }
 
-        it 'updates the issues passed to have no labels' do
-          expect(issues.map(&:reload).map(&:label_ids)).to all(be_empty)
+        it 'updates the labels of all issues passed to the labels passed' do
+          expect(issues.map(&:reload).map(&:label_ids)).to all(match_array(labels.map(&:id)))
         end
-      end
-    end
 
-    context 'when add_label_ids are passed' do
-      let(:issues) { [issue_all_labels, issue_bug_and_merge_requests, issue_no_labels] }
-      let(:add_labels) { [bug, regression, merge_requests] }
+        it 'does not update issues not passed in' do
+          expect(issue_bug_and_regression.label_ids).to contain_exactly(bug.id, regression.id)
+        end
 
-      it 'adds those label IDs to all issues passed' do
-        expect(issues.map(&:reload).map(&:label_ids)).to all(include(*add_labels.map(&:id)))
-      end
+        context 'when those label IDs are empty' do
+          let(:labels) { [] }
 
-      it 'does not update issues not passed in' do
-        expect(issue_bug_and_regression.label_ids).to contain_exactly(bug.id, regression.id)
+          it 'updates the issues passed to have no labels' do
+            expect(issues.map(&:reload).map(&:label_ids)).to all(be_empty)
+          end
+        end
       end
-    end
 
-    context 'when remove_label_ids are passed' do
-      let(:issues) { [issue_all_labels, issue_bug_and_merge_requests, issue_no_labels] }
-      let(:remove_labels) { [bug, regression, merge_requests] }
+      context 'when add_label_ids are passed' do
+        let(:issues) { [issue_all_labels, issue_bug_and_merge_requests, issue_no_labels] }
+        let(:add_labels) { [bug, regression, merge_requests] }
 
-      it 'removes those label IDs from all issues passed' do
-        expect(issues.map(&:reload).map(&:label_ids)).to all(be_empty)
-      end
+        it 'adds those label IDs to all issues passed' do
+          expect(issues.map(&:reload).map(&:label_ids)).to all(include(*add_labels.map(&:id)))
+        end
 
-      it 'does not update issues not passed in' do
-        expect(issue_bug_and_regression.label_ids).to contain_exactly(bug.id, regression.id)
+        it 'does not update issues not passed in' do
+          expect(issue_bug_and_regression.label_ids).to contain_exactly(bug.id, regression.id)
+        end
       end
-    end
 
-    context 'when add_label_ids and remove_label_ids are passed' do
-      let(:issues) { [issue_all_labels, issue_bug_and_merge_requests, issue_no_labels] }
-      let(:add_labels) { [bug] }
-      let(:remove_labels) { [merge_requests] }
+      context 'when remove_label_ids are passed' do
+        let(:issues) { [issue_all_labels, issue_bug_and_merge_requests, issue_no_labels] }
+        let(:remove_labels) { [bug, regression, merge_requests] }
 
-      it 'adds the label IDs to all issues passed' do
-        expect(issues.map(&:reload).map(&:label_ids)).to all(include(bug.id))
-      end
+        it 'removes those label IDs from all issues passed' do
+          expect(issues.map(&:reload).map(&:label_ids)).to all(be_empty)
+        end
 
-      it 'removes the label IDs from all issues passed' do
-        expect(issues.map(&:reload).map(&:label_ids).flatten).not_to include(merge_requests.id)
+        it 'does not update issues not passed in' do
+          expect(issue_bug_and_regression.label_ids).to contain_exactly(bug.id, regression.id)
+        end
       end
 
-      it 'does not update issues not passed in' do
-        expect(issue_bug_and_regression.label_ids).to contain_exactly(bug.id, regression.id)
-      end
-    end
+      context 'when add_label_ids and remove_label_ids are passed' do
+        let(:issues) { [issue_all_labels, issue_bug_and_merge_requests, issue_no_labels] }
+        let(:add_labels) { [bug] }
+        let(:remove_labels) { [merge_requests] }
 
-    context 'when add_label_ids and label_ids are passed' do
-      let(:issues) { [issue_all_labels, issue_bug_and_regression, issue_bug_and_merge_requests] }
-      let(:labels) { [merge_requests] }
-      let(:add_labels) { [regression] }
+        it 'adds the label IDs to all issues passed' do
+          expect(issues.map(&:reload).map(&:label_ids)).to all(include(bug.id))
+        end
 
-      it 'adds the label IDs to all issues passed' do
-        expect(issues.map(&:reload).map(&:label_ids)).to all(include(regression.id))
-      end
+        it 'removes the label IDs from all issues passed' do
+          expect(issues.map(&:reload).map(&:label_ids).flatten).not_to include(merge_requests.id)
+        end
 
-      it 'ignores the label IDs parameter' do
-        expect(issues.map(&:reload).map(&:label_ids)).to all(include(bug.id))
+        it 'does not update issues not passed in' do
+          expect(issue_bug_and_regression.label_ids).to contain_exactly(bug.id, regression.id)
+        end
       end
 
-      it 'does not update issues not passed in' do
-        expect(issue_no_labels.label_ids).to be_empty
-      end
-    end
+      context 'when add_label_ids and label_ids are passed' do
+        let(:issues) { [issue_all_labels, issue_bug_and_regression, issue_bug_and_merge_requests] }
+        let(:labels) { [merge_requests] }
+        let(:add_labels) { [regression] }
 
-    context 'when remove_label_ids and label_ids are passed' do
-      let(:issues) { [issue_no_labels, issue_bug_and_regression] }
-      let(:labels) { [merge_requests] }
-      let(:remove_labels) { [regression] }
+        it 'adds the label IDs to all issues passed' do
+          expect(issues.map(&:reload).map(&:label_ids)).to all(include(regression.id))
+        end
 
-      it 'removes the label IDs from all issues passed' do
-        expect(issues.map(&:reload).map(&:label_ids).flatten).not_to include(regression.id)
-      end
+        it 'ignores the label IDs parameter' do
+          expect(issues.map(&:reload).map(&:label_ids)).to all(include(bug.id))
+        end
 
-      it 'ignores the label IDs parameter' do
-        expect(issues.map(&:reload).map(&:label_ids).flatten).not_to include(merge_requests.id)
+        it 'does not update issues not passed in' do
+          expect(issue_no_labels.label_ids).to be_empty
+        end
       end
 
-      it 'does not update issues not passed in' do
-        expect(issue_all_labels.label_ids).to contain_exactly(bug.id, regression.id, merge_requests.id)
-      end
-    end
+      context 'when remove_label_ids and label_ids are passed' do
+        let(:issues) { [issue_no_labels, issue_bug_and_regression] }
+        let(:labels) { [merge_requests] }
+        let(:remove_labels) { [regression] }
 
-    context 'when add_label_ids, remove_label_ids, and label_ids are passed' do
-      let(:issues) { [issue_bug_and_merge_requests, issue_no_labels] }
-      let(:labels) { [regression] }
-      let(:add_labels) { [bug] }
-      let(:remove_labels) { [merge_requests] }
+        it 'removes the label IDs from all issues passed' do
+          expect(issues.map(&:reload).map(&:label_ids).flatten).not_to include(regression.id)
+        end
 
-      it 'adds the label IDs to all issues passed' do
-        expect(issues.map(&:reload).map(&:label_ids)).to all(include(bug.id))
-      end
+        it 'ignores the label IDs parameter' do
+          expect(issues.map(&:reload).map(&:label_ids).flatten).not_to include(merge_requests.id)
+        end
 
-      it 'removes the label IDs from all issues passed' do
-        expect(issues.map(&:reload).map(&:label_ids).flatten).not_to include(merge_requests.id)
+        it 'does not update issues not passed in' do
+          expect(issue_all_labels.label_ids).to contain_exactly(bug.id, regression.id, merge_requests.id)
+        end
       end
 
-      it 'ignores the label IDs parameter' do
-        expect(issues.map(&:reload).map(&:label_ids).flatten).not_to include(regression.id)
-      end
+      context 'when add_label_ids, remove_label_ids, and label_ids are passed' do
+        let(:issues) { [issue_bug_and_merge_requests, issue_no_labels] }
+        let(:labels) { [regression] }
+        let(:add_labels) { [bug] }
+        let(:remove_labels) { [merge_requests] }
 
-      it 'does not update issues not passed in' do
-        expect(issue_bug_and_regression.label_ids).to contain_exactly(bug.id, regression.id)
+        it 'adds the label IDs to all issues passed' do
+          expect(issues.map(&:reload).map(&:label_ids)).to all(include(bug.id))
+        end
+
+        it 'removes the label IDs from all issues passed' do
+          expect(issues.map(&:reload).map(&:label_ids).flatten).not_to include(merge_requests.id)
+        end
+
+        it 'ignores the label IDs parameter' do
+          expect(issues.map(&:reload).map(&:label_ids).flatten).not_to include(regression.id)
+        end
+
+        it 'does not update issues not passed in' do
+          expect(issue_bug_and_regression.label_ids).to contain_exactly(bug.id, regression.id)
+        end
       end
     end
-  end
 
-  describe 'subscribe to issues' do
-    let(:issues) { create_list(:issue, 2, project: project) }
+    describe 'subscribe to issues' do
+      let(:issues) { create_list(:issue, 2, project: project) }
 
-    it 'subscribes the given user' do
-      bulk_update(issues, subscription_event: 'subscribe')
+      it 'subscribes the given user' do
+        bulk_update(issues, subscription_event: 'subscribe')
 
-      expect(issues).to all(be_subscribed(user, project))
+        expect(issues).to all(be_subscribed(user, project))
+      end
     end
-  end
 
-  describe 'unsubscribe from issues' do
-    let(:issues) do
-      create_list(:closed_issue, 2, project: project) do |issue|
-        issue.subscriptions.create(user: user, project: project, subscribed: true)
+    describe 'unsubscribe from issues' do
+      let(:issues) do
+        create_list(:closed_issue, 2, project: project) do |issue|
+          issue.subscriptions.create(user: user, project: project, subscribed: true)
+        end
+      end
+
+      it 'unsubscribes the given user' do
+        bulk_update(issues, subscription_event: 'unsubscribe')
+
+        issues.each do |issue|
+          expect(issue).not_to be_subscribed(user, project)
+        end
       end
     end
+  end
 
-    it 'unsubscribes the given user' do
-      bulk_update(issues, subscription_event: 'unsubscribe')
+  context 'with group issues' do
+    let(:group) { create(:group) }
 
-      issues.each do |issue|
-        expect(issue).not_to be_subscribed(user, project)
+    context 'updating milestone' do
+      let(:milestone) { create(:milestone, group: group) }
+      let(:project1)  { create(:project, :repository, group: group) }
+      let(:project2)  { create(:project, :repository, group: group) }
+      let(:issue1)    { create(:issue, project: project1) }
+      let(:issue2)    { create(:issue, project: project2) }
+      let(:issues)    { [issue1, issue2] }
+
+      before do
+        group.add_maintainer(user)
       end
+
+      it_behaves_like 'updates milestones'
     end
   end
 end
diff --git a/spec/services/issues/update_service_spec.rb b/spec/services/issues/update_service_spec.rb
index 28fa5d12d9c..468e7c286d5 100644
--- a/spec/services/issues/update_service_spec.rb
+++ b/spec/services/issues/update_service_spec.rb
@@ -480,6 +480,22 @@ describe Issues::UpdateService, :mailer do
           update_issue(description: "- [x] Task 1\n- [X] Task 2")
         end
 
+        it 'does not check for spam on task status change' do
+          params = {
+            update_task: {
+              index: 1,
+              checked: false,
+              line_source: '- [x] Task 1',
+              line_number: 1
+            }
+          }
+          service = described_class.new(project, user, params)
+
+          expect(service).not_to receive(:spam_check)
+
+          service.execute(issue)
+        end
+
         it 'creates system note about task status change' do
           note1 = find_note('marked the task **Task 1** as completed')
           note2 = find_note('marked the task **Task 2** as completed')
diff --git a/spec/services/merge_requests/merge_to_ref_service_spec.rb b/spec/services/merge_requests/merge_to_ref_service_spec.rb
index 61f99f82a76..14012b4ea2d 100644
--- a/spec/services/merge_requests/merge_to_ref_service_spec.rb
+++ b/spec/services/merge_requests/merge_to_ref_service_spec.rb
@@ -22,7 +22,6 @@ describe MergeRequests::MergeToRefService do
   shared_examples_for 'successfully merges to ref with merge method' do
     it 'writes commit to merge ref' do
       repository = project.repository
-      target_ref = merge_request.merge_ref_path
 
       expect(repository.ref_exists?(target_ref)).to be(false)
 
@@ -33,7 +32,7 @@ describe MergeRequests::MergeToRefService do
       expect(result[:status]).to eq(:success)
       expect(result[:commit_id]).to be_present
       expect(result[:source_id]).to eq(merge_request.source_branch_sha)
-      expect(result[:target_id]).to eq(merge_request.target_branch_sha)
+      expect(result[:target_id]).to eq(repository.commit(first_parent_ref).sha)
       expect(repository.ref_exists?(target_ref)).to be(true)
       expect(ref_head.id).to eq(result[:commit_id])
     end
@@ -74,17 +73,22 @@ describe MergeRequests::MergeToRefService do
 
   describe '#execute' do
     let(:service) do
-      described_class.new(project, user, commit_message: 'Awesome message',
-                                         should_remove_source_branch: true)
+      described_class.new(project, user, **params)
     end
 
+    let(:params) { { commit_message: 'Awesome message', should_remove_source_branch: true } }
+
     def process_merge_to_ref
       perform_enqueued_jobs do
         service.execute(merge_request)
       end
     end
 
-    it_behaves_like 'successfully merges to ref with merge method'
+    it_behaves_like 'successfully merges to ref with merge method' do
+      let(:first_parent_ref) { 'refs/heads/master' }
+      let(:target_ref) { merge_request.merge_ref_path }
+    end
+
     it_behaves_like 'successfully evaluates pre-condition checks'
 
     context 'commit history comparison with regular MergeService' do
@@ -129,14 +133,22 @@ describe MergeRequests::MergeToRefService do
       context 'when semi-linear merge method' do
         let(:merge_method) { :rebase_merge }
 
-        it_behaves_like 'successfully merges to ref with merge method'
+        it_behaves_like 'successfully merges to ref with merge method' do
+          let(:first_parent_ref) { 'refs/heads/master' }
+          let(:target_ref) { merge_request.merge_ref_path }
+        end
+
         it_behaves_like 'successfully evaluates pre-condition checks'
       end
 
       context 'when fast-forward merge method' do
         let(:merge_method) { :ff }
 
-        it_behaves_like 'successfully merges to ref with merge method'
+        it_behaves_like 'successfully merges to ref with merge method' do
+          let(:first_parent_ref) { 'refs/heads/master' }
+          let(:target_ref) { merge_request.merge_ref_path }
+        end
+
         it_behaves_like 'successfully evaluates pre-condition checks'
       end
 
@@ -178,5 +190,43 @@ describe MergeRequests::MergeToRefService do
 
       it { expect(todo).not_to be_done }
     end
+
+    context 'when target ref is passed as a parameter' do
+      let(:params) { { commit_message: 'merge train', target_ref: target_ref } }
+
+      it_behaves_like 'successfully merges to ref with merge method' do
+        let(:first_parent_ref) { 'refs/heads/master' }
+        let(:target_ref) { 'refs/merge-requests/1/train' }
+      end
+    end
+
+    describe 'cascading merge refs' do
+      set(:project) { create(:project, :repository) }
+      let(:params) { { commit_message: 'Cascading merge', first_parent_ref: first_parent_ref, target_ref: target_ref } }
+
+      context 'when first merge happens' do
+        let(:merge_request) do
+          create(:merge_request, source_project: project, source_branch: 'feature',
+                                 target_project: project, target_branch: 'master')
+        end
+
+        it_behaves_like 'successfully merges to ref with merge method' do
+          let(:first_parent_ref) { 'refs/heads/master' }
+          let(:target_ref) { 'refs/merge-requests/1/train' }
+        end
+
+        context 'when second merge happens' do
+          let(:merge_request) do
+            create(:merge_request, source_project: project, source_branch: 'improve/awesome',
+                                   target_project: project, target_branch: 'master')
+          end
+
+          it_behaves_like 'successfully merges to ref with merge method' do
+            let(:first_parent_ref) { 'refs/merge-requests/1/train' }
+            let(:target_ref) { 'refs/merge-requests/2/train' }
+          end
+        end
+      end
+    end
   end
 end
diff --git a/spec/services/merge_requests/rebase_service_spec.rb b/spec/services/merge_requests/rebase_service_spec.rb
index 7e2f03d1097..ee9caaf2f47 100644
--- a/spec/services/merge_requests/rebase_service_spec.rb
+++ b/spec/services/merge_requests/rebase_service_spec.rb
@@ -6,10 +6,12 @@ describe MergeRequests::RebaseService do
   include ProjectForksHelper
 
   let(:user) { create(:user) }
+  let(:rebase_jid) { 'fake-rebase-jid' }
   let(:merge_request) do
-    create(:merge_request,
+    create :merge_request,
            source_branch: 'feature_conflict',
-           target_branch: 'master')
+           target_branch: 'master',
+           rebase_jid: rebase_jid
   end
   let(:project) { merge_request.project }
   let(:repository) { project.repository.raw }
@@ -23,11 +25,11 @@ describe MergeRequests::RebaseService do
   describe '#execute' do
     context 'when another rebase is already in progress' do
       before do
-        allow(merge_request).to receive(:rebase_in_progress?).and_return(true)
+        allow(merge_request).to receive(:gitaly_rebase_in_progress?).and_return(true)
       end
 
       it 'saves the error message' do
-        subject.execute(merge_request)
+        service.execute(merge_request)
 
         expect(merge_request.reload.merge_error).to eq 'Rebase task canceled: Another rebase is already in progress'
       end
@@ -36,6 +38,13 @@ describe MergeRequests::RebaseService do
         expect(service.execute(merge_request)).to match(status: :error,
                                                         message: described_class::REBASE_ERROR)
       end
+
+      it 'clears rebase_jid' do
+        expect { service.execute(merge_request) }
+          .to change { merge_request.rebase_jid }
+          .from(rebase_jid)
+          .to(nil)
+      end
     end
 
     shared_examples 'sequence of failure and success' do
@@ -43,14 +52,19 @@ describe MergeRequests::RebaseService do
         allow(repository).to receive(:gitaly_operation_client).and_raise('Something went wrong')
 
         service.execute(merge_request)
+        merge_request.reload
 
-        expect(merge_request.reload.merge_error).to eq described_class::REBASE_ERROR
+        expect(merge_request.reload.merge_error).to eq(described_class::REBASE_ERROR)
+        expect(merge_request.rebase_jid).to eq(nil)
 
         allow(repository).to receive(:gitaly_operation_client).and_call_original
+        merge_request.update!(rebase_jid: rebase_jid)
 
         service.execute(merge_request)
+        merge_request.reload
 
-        expect(merge_request.reload.merge_error).to eq nil
+        expect(merge_request.merge_error).to eq(nil)
+        expect(merge_request.rebase_jid).to eq(nil)
       end
     end
 
@@ -72,7 +86,7 @@ describe MergeRequests::RebaseService do
       it 'saves a generic error message' do
         subject.execute(merge_request)
 
-        expect(merge_request.reload.merge_error).to eq described_class::REBASE_ERROR
+        expect(merge_request.reload.merge_error).to eq(described_class::REBASE_ERROR)
       end
 
       it 'returns an error' do
diff --git a/spec/services/system_note_service_spec.rb b/spec/services/system_note_service_spec.rb
index 2a2547f9400..157cfc46e69 100644
--- a/spec/services/system_note_service_spec.rb
+++ b/spec/services/system_note_service_spec.rb
@@ -332,7 +332,7 @@ describe SystemNoteService do
       create(:merge_request, source_project: project, target_project: project)
     end
 
-    subject { described_class.merge_when_pipeline_succeeds(noteable, project, author, noteable.diff_head_commit) }
+    subject { described_class.merge_when_pipeline_succeeds(noteable, project, author, pipeline.sha) }
 
     it_behaves_like 'a system note' do
       let(:action) { 'merge' }
@@ -359,6 +359,22 @@ describe SystemNoteService do
     end
   end
 
+  describe '.abort_merge_when_pipeline_succeeds' do
+    let(:noteable) do
+      create(:merge_request, source_project: project, target_project: project)
+    end
+
+    subject { described_class.abort_merge_when_pipeline_succeeds(noteable, project, author, 'merge request was closed') }
+
+    it_behaves_like 'a system note' do
+      let(:action) { 'merge' }
+    end
+
+    it "posts the 'merge when pipeline succeeds' system note" do
+      expect(subject.note).to eq "aborted the automatic merge because merge request was closed"
+    end
+  end
+
   describe '.change_title' do
     let(:noteable) { create(:issue, project: project, title: 'Lorem ipsum') }
 
@@ -1175,16 +1191,30 @@ describe SystemNoteService do
       end
 
       it 'links to the diff in the system note' do
-        expect(subject.note).to include('version 1')
-
         diff_id = merge_request.merge_request_diff.id
         line_code = change_position.line_code(project.repository)
-        expect(subject.note).to include(diffs_project_merge_request_path(project, merge_request, diff_id: diff_id, anchor: line_code))
+        link = diffs_project_merge_request_path(project, merge_request, diff_id: diff_id, anchor: line_code)
+
+        expect(subject.note).to eq("changed this line in [version 1 of the diff](#{link})")
+      end
+
+      context 'discussion is on an image' do
+        let(:discussion) { create(:image_diff_note_on_merge_request, project: project).to_discussion }
+
+        it 'links to the diff in the system note' do
+          diff_id = merge_request.merge_request_diff.id
+          file_hash = change_position.file_hash
+          link = diffs_project_merge_request_path(project, merge_request, diff_id: diff_id, anchor: file_hash)
+
+          expect(subject.note).to eq("changed this file in [version 1 of the diff](#{link})")
+        end
       end
     end
 
-    context 'when the change_position is invalid for the discussion' do
-      let(:change_position) { project.commit(sample_commit.id) }
+    context 'when the change_position does not point to a valid version' do
+      before do
+        allow(merge_request).to receive(:version_params_for).and_return(nil)
+      end
 
       it 'creates a new note in the discussion' do
         # we need to completely rebuild the merge request object, or the `@discussions` on the merge request are not reloaded.
diff --git a/spec/support/helpers/devise_helpers.rb b/spec/support/helpers/devise_helpers.rb
index d32bc2424c0..fb2a110422a 100644
--- a/spec/support/helpers/devise_helpers.rb
+++ b/spec/support/helpers/devise_helpers.rb
@@ -21,4 +21,16 @@ module DeviseHelpers
       context.env
     end
   end
+
+  def with_omniauth_full_host(&block)
+    # The OmniAuth `full_host` parameter doesn't get set correctly (it gets set to something like `http://localhost`
+    # here), and causes integration tests to fail with 404s. We set the `full_host` by removing the request path (and
+    # anything after it) from the request URI.
+    omniauth_config_full_host = OmniAuth.config.full_host
+    OmniAuth.config.full_host = ->(request) { ActionDispatch::Request.new(request).base_url }
+
+    yield
+
+    OmniAuth.config.full_host = omniauth_config_full_host
+  end
 end
diff --git a/spec/support/helpers/fake_u2f_device.rb b/spec/support/helpers/fake_u2f_device.rb
index a7605cd483a..22cd8152d77 100644
--- a/spec/support/helpers/fake_u2f_device.rb
+++ b/spec/support/helpers/fake_u2f_device.rb
@@ -32,6 +32,10 @@ class FakeU2fDevice
     ")
   end
 
+  def fake_u2f_authentication
+    @page.execute_script("window.gl.u2fAuthenticate.renderAuthenticated('abc');")
+  end
+
   private
 
   def u2f_device(app_id)
diff --git a/spec/support/helpers/git_http_helpers.rb b/spec/support/helpers/git_http_helpers.rb
index cd49bb148f2..c83860d7b51 100644
--- a/spec/support/helpers/git_http_helpers.rb
+++ b/spec/support/helpers/git_http_helpers.rb
@@ -1,4 +1,8 @@
+require_relative 'workhorse_helpers'
+
 module GitHttpHelpers
+  include WorkhorseHelpers
+
   def clone_get(project, options = {})
     get "/#{project}/info/refs", params: { service: 'git-upload-pack' }, headers: auth_env(*options.values_at(:user, :password, :spnego_request_token))
   end
diff --git a/spec/support/helpers/login_helpers.rb b/spec/support/helpers/login_helpers.rb
index 0bb2d2510c2..0cb99b4e087 100644
--- a/spec/support/helpers/login_helpers.rb
+++ b/spec/support/helpers/login_helpers.rb
@@ -87,12 +87,17 @@ module LoginHelpers
     click_link "oauth-login-#{provider}"
   end
 
+  def fake_successful_u2f_authentication
+    allow(U2fRegistration).to receive(:authenticate).and_return(true)
+    FakeU2fDevice.new(page, nil).fake_u2f_authentication
+  end
+
   def mock_auth_hash_with_saml_xml(provider, uid, email, saml_response)
     response_object = { document: saml_xml(saml_response) }
     mock_auth_hash(provider, uid, email, response_object: response_object)
   end
 
-  def mock_auth_hash(provider, uid, email, response_object: nil)
+  def configure_mock_auth(provider, uid, email, response_object: nil)
     # The mock_auth configuration allows you to set per-provider (or default)
     # authentication hashes to return during integration testing.
     OmniAuth.config.mock_auth[provider.to_sym] = OmniAuth::AuthHash.new({
@@ -118,6 +123,11 @@ module LoginHelpers
         response_object: response_object
       }
     })
+  end
+
+  def mock_auth_hash(provider, uid, email, response_object: nil)
+    configure_mock_auth(provider, uid, email, response_object: response_object)
+
     original_env_config_omniauth_auth = Rails.application.env_config['omniauth.auth']
     Rails.application.env_config['omniauth.auth'] = OmniAuth.config.mock_auth[provider.to_sym]
 
diff --git a/spec/support/helpers/position_tracer_helpers.rb b/spec/support/helpers/position_tracer_helpers.rb
new file mode 100644
index 00000000000..bbf6e06dd40
--- /dev/null
+++ b/spec/support/helpers/position_tracer_helpers.rb
@@ -0,0 +1,93 @@
+# frozen_string_literal: true
+
+module PositionTracerHelpers
+  def diff_refs(base_commit, head_commit)
+    Gitlab::Diff::DiffRefs.new(base_sha: base_commit.id, head_sha: head_commit.id)
+  end
+
+  def position(attrs = {})
+    attrs.reverse_merge!(
+      diff_refs: old_diff_refs
+    )
+    Gitlab::Diff::Position.new(attrs)
+  end
+
+  def expect_new_position(attrs, result = subject)
+    aggregate_failures("expect new position #{attrs.inspect}") do
+      if attrs.nil?
+        expect(result[:outdated]).to be_truthy
+      else
+        new_position = result[:position]
+
+        expect(result[:outdated]).to be_falsey
+        expect(new_position).not_to be_nil
+        expect(new_position.diff_refs).to eq(new_diff_refs)
+
+        attrs.each do |attr, value|
+          expect(new_position.send(attr)).to eq(value)
+        end
+      end
+    end
+  end
+
+  def expect_change_position(attrs, result = subject)
+    aggregate_failures("expect change position #{attrs.inspect}") do
+      change_position = result[:position]
+
+      expect(result[:outdated]).to be_truthy
+
+      if attrs.nil? || attrs.empty?
+        expect(change_position).to be_nil
+      else
+        expect(change_position).not_to be_nil
+        expect(change_position.diff_refs).to eq(change_diff_refs)
+
+        attrs.each do |attr, value|
+          expect(change_position.send(attr)).to eq(value)
+        end
+      end
+    end
+  end
+
+  def create_branch(new_name, branch_name)
+    CreateBranchService.new(project, current_user).execute(new_name, branch_name)
+  end
+
+  def create_file(branch_name, file_name, content)
+    Files::CreateService.new(
+      project,
+      current_user,
+      start_branch: branch_name,
+      branch_name: branch_name,
+      commit_message: "Create file",
+      file_path: file_name,
+      file_content: content
+    ).execute
+    project.commit(branch_name)
+  end
+
+  def update_file(branch_name, file_name, content)
+    Files::UpdateService.new(
+      project,
+      current_user,
+      start_branch: branch_name,
+      branch_name: branch_name,
+      commit_message: "Update file",
+      file_path: file_name,
+      file_content: content
+    ).execute
+    project.commit(branch_name)
+  end
+
+  def delete_file(branch_name, file_name)
+    Files::DeleteService.new(
+      project,
+      current_user,
+      start_branch: branch_name,
+      branch_name: branch_name,
+      commit_message: "Delete file",
+      file_path: file_name
+    ).execute
+    project.commit(branch_name)
+  end
+end
diff --git a/spec/support/helpers/reactive_caching_helpers.rb b/spec/support/helpers/reactive_caching_helpers.rb
index b76b53db0b9..528da37e8cf 100644
--- a/spec/support/helpers/reactive_caching_helpers.rb
+++ b/spec/support/helpers/reactive_caching_helpers.rb
@@ -10,7 +10,7 @@ module ReactiveCachingHelpers
   def stub_reactive_cache(subject = nil, data = nil, *qualifiers)
     allow(ReactiveCachingWorker).to receive(:perform_async)
     allow(ReactiveCachingWorker).to receive(:perform_in)
-    write_reactive_cache(subject, data, *qualifiers) unless data.nil?
+    write_reactive_cache(subject, data, *qualifiers) unless subject.nil?
   end
 
   def synchronous_reactive_cache(subject)
diff --git a/spec/support/test_reports/test_reports_helper.rb b/spec/support/test_reports/test_reports_helper.rb
index 45c6e04dbf3..6840fb9a860 100644
--- a/spec/support/test_reports/test_reports_helper.rb
+++ b/spec/support/test_reports/test_reports_helper.rb
@@ -1,36 +1,36 @@
 module TestReportsHelper
-  def create_test_case_rspec_success
+  def create_test_case_rspec_success(name = 'test_spec')
     Gitlab::Ci::Reports::TestCase.new(
       name: 'Test#sum when a is 1 and b is 3 returns summary',
-      classname: 'spec.test_spec',
+      classname: "spec.#{name}",
       file: './spec/test_spec.rb',
       execution_time: 1.11,
       status: Gitlab::Ci::Reports::TestCase::STATUS_SUCCESS)
   end
 
-  def create_test_case_rspec_failed
+  def create_test_case_rspec_failed(name = 'test_spec')
     Gitlab::Ci::Reports::TestCase.new(
-      name: 'Test#sum when a is 2 and b is 2 returns summary',
-      classname: 'spec.test_spec',
+      name: 'Test#sum when a is 1 and b is 3 returns summary',
+      classname: "spec.#{name}",
       file: './spec/test_spec.rb',
       execution_time: 2.22,
       system_output: sample_rspec_failed_message,
       status: Gitlab::Ci::Reports::TestCase::STATUS_FAILED)
   end
 
-  def create_test_case_rspec_skipped
+  def create_test_case_rspec_skipped(name = 'test_spec')
     Gitlab::Ci::Reports::TestCase.new(
       name: 'Test#sum when a is 3 and b is 3 returns summary',
-      classname: 'spec.test_spec',
+      classname: "spec.#{name}",
       file: './spec/test_spec.rb',
       execution_time: 3.33,
       status: Gitlab::Ci::Reports::TestCase::STATUS_SKIPPED)
   end
 
-  def create_test_case_rspec_error
+  def create_test_case_rspec_error(name = 'test_spec')
     Gitlab::Ci::Reports::TestCase.new(
       name: 'Test#sum when a is 4 and b is 4 returns summary',
-      classname: 'spec.test_spec',
+      classname: "spec.#{name}",
       file: './spec/test_spec.rb',
       execution_time: 4.44,
       status: Gitlab::Ci::Reports::TestCase::STATUS_ERROR)
@@ -48,34 +48,34 @@ module TestReportsHelper
     EOF
   end
 
-  def create_test_case_java_success
+  def create_test_case_java_success(name = 'addTest')
     Gitlab::Ci::Reports::TestCase.new(
-      name: 'addTest',
+      name: name,
       classname: 'CalculatorTest',
       execution_time: 5.55,
       status: Gitlab::Ci::Reports::TestCase::STATUS_SUCCESS)
   end
 
-  def create_test_case_java_failed
+  def create_test_case_java_failed(name = 'addTest')
     Gitlab::Ci::Reports::TestCase.new(
-      name: 'subtractTest',
+      name: name,
       classname: 'CalculatorTest',
       execution_time: 6.66,
       system_output: sample_java_failed_message,
       status: Gitlab::Ci::Reports::TestCase::STATUS_FAILED)
   end
 
-  def create_test_case_java_skipped
+  def create_test_case_java_skipped(name = 'addTest')
     Gitlab::Ci::Reports::TestCase.new(
-      name: 'multiplyTest',
+      name: name,
       classname: 'CalculatorTest',
       execution_time: 7.77,
       status: Gitlab::Ci::Reports::TestCase::STATUS_SKIPPED)
   end
 
-  def create_test_case_java_error
+  def create_test_case_java_error(name = 'addTest')
     Gitlab::Ci::Reports::TestCase.new(
-      name: 'divideTest',
+      name: name,
       classname: 'CalculatorTest',
       execution_time: 8.88,
       status: Gitlab::Ci::Reports::TestCase::STATUS_ERROR)
diff --git a/spec/uploaders/file_mover_spec.rb b/spec/uploaders/file_mover_spec.rb
index a9e03f3d4e5..5ee0a10f38d 100644
--- a/spec/uploaders/file_mover_spec.rb
+++ b/spec/uploaders/file_mover_spec.rb
@@ -85,8 +85,7 @@ describe FileMover do
 
     context 'when tmp uploader is not local storage' do
       before do
-        allow(PersonalFileUploader).to receive(:object_store_enabled?) { true }
-        tmp_uploader.object_store = ObjectStorage::Store::REMOTE
+        stub_uploads_object_storage(uploader: PersonalFileUploader)
         allow_any_instance_of(PersonalFileUploader).to receive(:file_storage?) { false }
       end
 
diff --git a/spec/uploaders/file_uploader_spec.rb b/spec/uploaders/file_uploader_spec.rb
index 185c62491ce..04206de3dc6 100644
--- a/spec/uploaders/file_uploader_spec.rb
+++ b/spec/uploaders/file_uploader_spec.rb
@@ -184,40 +184,37 @@ describe FileUploader do
     end
   end
 
-  describe '#cache!' do
-    subject do
-      uploader.store!(uploaded_file)
-    end
+  context 'when remote file is used' do
+    let(:temp_file) { Tempfile.new("test") }
 
-    context 'when remote file is used' do
-      let(:temp_file) { Tempfile.new("test") }
+    let!(:fog_connection) do
+      stub_uploads_object_storage(described_class)
+    end
 
-      let!(:fog_connection) do
-        stub_uploads_object_storage(described_class)
-      end
+    let(:filename) { "my file.txt" }
+    let(:uploaded_file) do
+      UploadedFile.new(temp_file.path, filename: filename, remote_id: "test/123123")
+    end
 
-      let(:uploaded_file) do
-        UploadedFile.new(temp_file.path, filename: "my file.txt", remote_id: "test/123123")
-      end
+    let!(:fog_file) do
+      fog_connection.directories.new(key: 'uploads').files.create(
+        key: 'tmp/uploads/test/123123',
+        body: 'content'
+      )
+    end
 
-      let!(:fog_file) do
-        fog_connection.directories.new(key: 'uploads').files.create(
-          key: 'tmp/uploads/test/123123',
-          body: 'content'
-        )
-      end
+    before do
+      FileUtils.touch(temp_file)
 
-      before do
-        FileUtils.touch(temp_file)
-      end
+      uploader.store!(uploaded_file)
+    end
 
-      after do
-        FileUtils.rm_f(temp_file)
-      end
+    after do
+      FileUtils.rm_f(temp_file)
+    end
 
+    describe '#cache!' do
       it 'file is stored remotely in permament location with sanitized name' do
-        subject
-
         expect(uploader).to be_exists
         expect(uploader).not_to be_cached
         expect(uploader).not_to be_file_storage
@@ -228,5 +225,18 @@ describe FileUploader do
         expect(uploader.object_store).to eq(described_class::Store::REMOTE)
       end
     end
+
+    describe '#to_h' do
+      subject { uploader.to_h }
+
+      let(:filename) { 'my+file.txt' }
+
+      it 'generates URL using original file name instead of filename returned by object storage' do
+        # GCS returns a URL with a `+` instead of `%2B`
+        allow(uploader.file).to receive(:url).and_return('https://storage.googleapis.com/gitlab-test-uploads/@hashed/6b/86/6b86b273ff34fce19d6b804eff5a3f5747ada4eaa22f1d49c01e52ddb7875b4b/64c5065e62100b1a12841644256a98be/my+file.txt')
+
+        expect(subject[:url]).to end_with(filename)
+      end
+    end
   end
 end
diff --git a/spec/workers/namespaces/schedule_aggregation_worker_spec.rb b/spec/workers/namespaces/schedule_aggregation_worker_spec.rb
index 7432ca12f2a..d4a49a3f53a 100644
--- a/spec/workers/namespaces/schedule_aggregation_worker_spec.rb
+++ b/spec/workers/namespaces/schedule_aggregation_worker_spec.rb
@@ -2,7 +2,7 @@
 
 require 'spec_helper'
 
-describe Namespaces::ScheduleAggregationWorker, '#perform' do
+describe Namespaces::ScheduleAggregationWorker, '#perform', :clean_gitlab_redis_shared_state do
   let(:group) { create(:group) }
 
   subject(:worker) { described_class.new }
@@ -10,6 +10,8 @@ describe Namespaces::ScheduleAggregationWorker, '#perform' do
   context 'when group is the root ancestor' do
     context 'when aggregation schedule exists' do
       it 'does not create a new one' do
+        stub_aggregation_schedule_statistics
+
         Namespace::AggregationSchedule.safe_find_or_create_by!(namespace_id: group.id)
 
         expect do
@@ -18,26 +20,25 @@ describe Namespaces::ScheduleAggregationWorker, '#perform' do
       end
     end
 
-    context 'when update_statistics_namespace is off' do
-      it 'does not create a new one' do
-        stub_feature_flags(update_statistics_namespace: false, namespace: group)
+    context 'when aggregation schedule does not exist' do
+      it 'creates one' do
+        stub_aggregation_schedule_statistics
 
         expect do
           worker.perform(group.id)
-        end.not_to change(Namespace::AggregationSchedule, :count)
+        end.to change(Namespace::AggregationSchedule, :count).by(1)
+
+        expect(group.aggregation_schedule).to be_present
       end
     end
 
-    context 'when aggregation schedule does not exist' do
-      it 'creates one' do
-        allow_any_instance_of(Namespace::AggregationSchedule)
-          .to receive(:schedule_root_storage_statistics).and_return(nil)
+    context 'when update_statistics_namespace is off' do
+      it 'does not create a new one' do
+        stub_feature_flags(update_statistics_namespace: false, namespace: group)
 
         expect do
           worker.perform(group.id)
-        end.to change(Namespace::AggregationSchedule, :count).by(1)
-
-        expect(group.aggregation_schedule).to be_present
+        end.not_to change(Namespace::AggregationSchedule, :count)
       end
     end
   end
@@ -47,8 +48,7 @@ describe Namespaces::ScheduleAggregationWorker, '#perform' do
     let(:group) { create(:group, parent: parent_group) }
 
     it 'creates an aggregation schedule for the root' do
-      allow_any_instance_of(Namespace::AggregationSchedule)
-        .to receive(:schedule_root_storage_statistics).and_return(nil)
+      stub_aggregation_schedule_statistics
 
       worker.perform(group.id)
 
@@ -63,4 +63,15 @@ describe Namespaces::ScheduleAggregationWorker, '#perform' do
       worker.perform(12345)
     end
   end
+
+  def stub_aggregation_schedule_statistics
+    # Namespace::Aggregations are deleted by
+    # Namespace::AggregationSchedule::schedule_root_storage_statistics,
+    # which is executed async. Stubing the service so instances are not deleted
+    # while still running the specs.
+    expect_next_instance_of(Namespace::AggregationSchedule) do |aggregation_schedule|
+      expect(aggregation_schedule)
+        .to receive(:schedule_root_storage_statistics)
+    end
+  end
 end
diff --git a/spec/workers/project_cache_worker_spec.rb b/spec/workers/project_cache_worker_spec.rb
index 51afb076da1..edc55920b8e 100644
--- a/spec/workers/project_cache_worker_spec.rb
+++ b/spec/workers/project_cache_worker_spec.rb
@@ -36,6 +36,11 @@ describe ProjectCacheWorker do
     end
 
     context 'with an existing project' do
+      before do
+        lease_key = "namespace:namespaces_root_statistics:#{project.namespace_id}"
+        stub_exclusive_lease_taken(lease_key, timeout: Namespace::AggregationSchedule::DEFAULT_LEASE_TIMEOUT)
+      end
+
       it 'refreshes the method caches' do
         expect_any_instance_of(Repository).to receive(:refresh_method_caches)
           .with(%i(readme))
@@ -81,6 +86,10 @@ describe ProjectCacheWorker do
 
         expect(UpdateProjectStatisticsWorker).not_to receive(:perform_in)
 
+        expect(Namespaces::ScheduleAggregationWorker)
+          .not_to receive(:perform_async)
+          .with(project.namespace_id)
+
         worker.update_statistics(project, statistics)
       end
     end
@@ -98,6 +107,11 @@ describe ProjectCacheWorker do
           .with(lease_timeout, project.id, statistics)
           .and_call_original
 
+        expect(Namespaces::ScheduleAggregationWorker)
+          .to receive(:perform_async)
+          .with(project.namespace_id)
+          .twice
+
         worker.update_statistics(project, statistics)
       end
     end