Merge branch 'bvl-external-auth-port' into 'master'

Port `read_cross_project` ability from EE

See merge request gitlab-org/gitlab-ce!17208

41 files changed, 1366 insertions, 86 deletions

diff --git a/spec/controllers/boards/issues_controller_spec.rb b/spec/controllers/boards/issues_controller_spec.rb
index 79bbc29e80d..4770e187db6 100644
--- a/spec/controllers/boards/issues_controller_spec.rb
+++ b/spec/controllers/boards/issues_controller_spec.rb
@@ -86,6 +86,7 @@ describe Boards::IssuesController do
 
     context 'with unauthorized user' do
       before do
+        allow(Ability).to receive(:allowed?).and_call_original
         allow(Ability).to receive(:allowed?).with(user, :read_project, project).and_return(true)
         allow(Ability).to receive(:allowed?).with(user, :read_issue, project).and_return(false)
       end
diff --git a/spec/controllers/concerns/controller_with_cross_project_access_check_spec.rb b/spec/controllers/concerns/controller_with_cross_project_access_check_spec.rb
new file mode 100644
index 00000000000..27f558e1b5d
--- /dev/null
+++ b/spec/controllers/concerns/controller_with_cross_project_access_check_spec.rb
@@ -0,0 +1,146 @@
+require 'spec_helper'
+
+describe ControllerWithCrossProjectAccessCheck do
+  let(:user) { create(:user) }
+
+  before do
+    sign_in user
+  end
+
+  render_views
+
+  context 'When reading cross project is not allowed' do
+    before do
+      allow(Ability).to receive(:allowed).and_call_original
+      allow(Ability).to receive(:allowed?)
+                          .with(user, :read_cross_project, :global)
+                          .and_return(false)
+    end
+
+    describe '#requires_cross_project_access' do
+      controller(ApplicationController) do
+        # `described_class` is not available in this context
+        include ControllerWithCrossProjectAccessCheck # rubocop:disable RSpec/DescribedClass
+
+        requires_cross_project_access :index, show: false,
+                                              unless: -> { unless_condition },
+                                              if: -> { if_condition }
+
+        def index
+          render nothing: true
+        end
+
+        def show
+          render nothing: true
+        end
+
+        def unless_condition
+          false
+        end
+
+        def if_condition
+          true
+        end
+      end
+
+      it 'renders a 404 with trying to access a cross project page' do
+        message = "This page is unavailable because you are not allowed to read "\
+                  "information across multiple projects."
+
+        get :index
+
+        expect(response).to have_gitlab_http_status(404)
+        expect(response.body).to match(/#{message}/)
+      end
+
+      it 'is skipped when the `if` condition returns false' do
+        expect(controller).to receive(:if_condition).and_return(false)
+
+        get :index
+
+        expect(response).to have_gitlab_http_status(200)
+      end
+
+      it 'is skipped when the `unless` condition returns true' do
+        expect(controller).to receive(:unless_condition).and_return(true)
+
+        get :index
+
+        expect(response).to have_gitlab_http_status(200)
+      end
+
+      it 'correctly renders an action that does not require cross project access' do
+        get :show, id: 'nothing'
+
+        expect(response).to have_gitlab_http_status(200)
+      end
+    end
+
+    describe '#skip_cross_project_access_check' do
+      controller(ApplicationController) do
+        # `described_class` is not available in this context
+        include ControllerWithCrossProjectAccessCheck # rubocop:disable RSpec/DescribedClass
+
+        requires_cross_project_access
+
+        skip_cross_project_access_check index: true, show: false,
+                                        unless: -> { unless_condition },
+                                        if: -> { if_condition }
+
+        def index
+          render nothing: true
+        end
+
+        def show
+          render nothing: true
+        end
+
+        def edit
+          render nothing: true
+        end
+
+        def unless_condition
+          false
+        end
+
+        def if_condition
+          true
+        end
+      end
+
+      it 'renders a success when the check is skipped' do
+        get :index
+
+        expect(response).to have_gitlab_http_status(200)
+      end
+
+      it 'is executed when the `if` condition returns false' do
+        expect(controller).to receive(:if_condition).and_return(false)
+
+        get :index
+
+        expect(response).to have_gitlab_http_status(404)
+      end
+
+      it 'is executed when the `unless` condition returns true' do
+        expect(controller).to receive(:unless_condition).and_return(true)
+
+        get :index
+
+        expect(response).to have_gitlab_http_status(404)
+      end
+
+      it 'does not skip the check on an action that is not skipped' do
+        get :show, id: 'hello'
+
+        expect(response).to have_gitlab_http_status(404)
+      end
+
+      it 'does not skip the check on an action that was not defined to skip' do
+        get :edit, id: 'hello'
+
+        expect(response).to have_gitlab_http_status(404)
+      end
+    end
+  end
+end
diff --git a/spec/controllers/projects/merge_requests/creations_controller_spec.rb b/spec/controllers/projects/merge_requests/creations_controller_spec.rb
index 92db7284e0e..24310b847e8 100644
--- a/spec/controllers/projects/merge_requests/creations_controller_spec.rb
+++ b/spec/controllers/projects/merge_requests/creations_controller_spec.rb
@@ -17,7 +17,7 @@ describe Projects::MergeRequests::CreationsController do
 
   before do
     fork_project.add_master(user)
-
+    Projects::ForkService.new(project, user).execute(fork_project)
     sign_in(user)
   end
 
@@ -125,4 +125,66 @@ describe Projects::MergeRequests::CreationsController do
       end
     end
   end
+
+  describe 'GET #branch_to' do
+    before do
+      allow(Ability).to receive(:allowed?).and_call_original
+    end
+
+    it 'fetches the commit if a user has access' do
+      expect(Ability).to receive(:allowed?).with(user, :read_project, project) { true }
+
+      get :branch_to,
+          namespace_id: fork_project.namespace,
+          project_id: fork_project,
+          target_project_id: project.id,
+          ref: 'master'
+
+      expect(assigns(:commit)).not_to be_nil
+      expect(response).to have_gitlab_http_status(200)
+    end
+
+    it 'does not load the commit when the user cannot read the project' do
+      expect(Ability).to receive(:allowed?).with(user, :read_project, project) { false }
+
+      get :branch_to,
+          namespace_id: fork_project.namespace,
+          project_id: fork_project,
+          target_project_id: project.id,
+          ref: 'master'
+
+      expect(assigns(:commit)).to be_nil
+      expect(response).to have_gitlab_http_status(200)
+    end
+  end
+
+  describe 'GET #update_branches' do
+    before do
+      allow(Ability).to receive(:allowed?).and_call_original
+    end
+
+    it 'lists the branches of another fork if the user has access' do
+      expect(Ability).to receive(:allowed?).with(user, :read_project, project) { true }
+
+      get :update_branches,
+          namespace_id: fork_project.namespace,
+          project_id: fork_project,
+          target_project_id: project.id
+
+      expect(assigns(:target_branches)).not_to be_empty
+      expect(response).to have_gitlab_http_status(200)
+    end
+
+    it 'does not list branches when the user cannot read the project' do
+      expect(Ability).to receive(:allowed?).with(user, :read_project, project) { false }
+
+      get :update_branches,
+          namespace_id: fork_project.namespace,
+          project_id: fork_project,
+          target_project_id: project.id
+
+      expect(response).to have_gitlab_http_status(200)
+      expect(assigns(:target_branches)).to eq([])
+    end
+  end
 end
diff --git a/spec/controllers/search_controller_spec.rb b/spec/controllers/search_controller_spec.rb
index 37f961d0c94..30c06ddf744 100644
--- a/spec/controllers/search_controller_spec.rb
+++ b/spec/controllers/search_controller_spec.rb
@@ -16,6 +16,32 @@ describe SearchController do
     expect(assigns[:search_objects].first).to eq note
   end
 
+  context 'when the user cannot read cross project' do
+    before do
+      allow(Ability).to receive(:allowed?).and_call_original
+      allow(Ability).to receive(:allowed?)
+                          .with(user, :read_cross_project, :global) { false }
+    end
+
+    it 'still allows accessing the search page' do
+      get :show
+
+      expect(response).to have_gitlab_http_status(200)
+    end
+
+    it 'still blocks searches without a project_id' do
+      get :show, search: 'hello'
+
+      expect(response).to have_gitlab_http_status(404)
+    end
+
+    it 'allows searches with a project_id' do
+      get :show, search: 'hello', project_id: create(:project, :public).id
+
+      expect(response).to have_gitlab_http_status(200)
+    end
+  end
+
   context 'on restricted projects' do
     context 'when signed out' do
       before do
diff --git a/spec/controllers/users_controller_spec.rb b/spec/controllers/users_controller_spec.rb
index 2898c4b119e..b0acf4a49ac 100644
--- a/spec/controllers/users_controller_spec.rb
+++ b/spec/controllers/users_controller_spec.rb
@@ -74,6 +74,31 @@ describe UsersController do
         end
       end
     end
+
+    context 'json with events' do
+      let(:project) { create(:project) }
+      before do
+        project.add_developer(user)
+        Gitlab::DataBuilder::Push.build_sample(project, user)
+
+        sign_in(user)
+      end
+
+      it 'loads events' do
+        get :show, username: user, format: :json
+
+        expect(assigns(:events)).not_to be_empty
+      end
+
+      it 'hides events if the user cannot read cross project' do
+        allow(Ability).to receive(:allowed?).and_call_original
+        expect(Ability).to receive(:allowed?).with(user, :read_cross_project) { false }
+
+        get :show, username: user, format: :json
+
+        expect(assigns(:events)).to be_empty
+      end
+    end
   end
 
   describe 'GET #calendar' do
diff --git a/spec/features/users/show_spec.rb b/spec/features/users/show_spec.rb
new file mode 100644
index 00000000000..b5bbb2c0ea5
--- /dev/null
+++ b/spec/features/users/show_spec.rb
@@ -0,0 +1,17 @@
+require 'spec_helper'
+
+describe 'User page' do
+  let(:user) { create(:user) }
+
+  it 'shows all the tabs' do
+    visit(user_path(user))
+
+    page.within '.nav-links' do
+      expect(page).to have_link('Activity')
+      expect(page).to have_link('Groups')
+      expect(page).to have_link('Contributed projects')
+      expect(page).to have_link('Personal projects')
+      expect(page).to have_link('Snippets')
+    end
+  end
+end
diff --git a/spec/finders/concerns/finder_methods_spec.rb b/spec/finders/concerns/finder_methods_spec.rb
new file mode 100644
index 00000000000..a4ad331f613
--- /dev/null
+++ b/spec/finders/concerns/finder_methods_spec.rb
@@ -0,0 +1,70 @@
+require 'spec_helper'
+
+describe FinderMethods do
+  let(:finder_class) do
+    Class.new do
+      include FinderMethods
+
+      attr_reader :current_user
+
+      def initialize(user)
+        @current_user = user
+      end
+
+      def execute
+        Project.all
+      end
+    end
+  end
+
+  let(:user) { create(:user) }
+  let(:finder) { finder_class.new(user) }
+  let(:authorized_project) { create(:project) }
+  let(:unauthorized_project) { create(:project) }
+
+  before do
+    authorized_project.add_developer(user)
+  end
+
+  describe '#find_by!' do
+    it 'returns the project if the user has access' do
+      expect(finder.find_by!(id: authorized_project.id)).to eq(authorized_project)
+    end
+
+    it 'raises not found when the project is not found' do
+      expect { finder.find_by!(id: 0) }.to raise_error(ActiveRecord::RecordNotFound)
+    end
+
+    it 'raises not found the user does not have access' do
+      expect { finder.find_by!(id: unauthorized_project.id) }.to raise_error(ActiveRecord::RecordNotFound)
+    end
+  end
+
+  describe '#find' do
+    it 'returns the project if the user has access' do
+      expect(finder.find(authorized_project.id)).to eq(authorized_project)
+    end
+
+    it 'raises not found when the project is not found' do
+      expect { finder.find(0) }.to raise_error(ActiveRecord::RecordNotFound)
+    end
+
+    it 'raises not found the user does not have access' do
+      expect { finder.find(unauthorized_project.id) }.to raise_error(ActiveRecord::RecordNotFound)
+    end
+  end
+
+  describe '#find_by' do
+    it 'returns the project if the user has access' do
+      expect(finder.find_by(id: authorized_project.id)).to eq(authorized_project)
+    end
+
+    it 'returns nil when the project is not found' do
+      expect(finder.find_by(id: 0)).to be_nil
+    end
+
+    it 'returns nil when the user does not have access' do
+      expect(finder.find_by(id: unauthorized_project.id)).to be_nil
+    end
+  end
+end
diff --git a/spec/finders/concerns/finder_with_cross_project_access_spec.rb b/spec/finders/concerns/finder_with_cross_project_access_spec.rb
new file mode 100644
index 00000000000..c784fb87972
--- /dev/null
+++ b/spec/finders/concerns/finder_with_cross_project_access_spec.rb
@@ -0,0 +1,118 @@
+require 'spec_helper'
+
+describe FinderWithCrossProjectAccess do
+  let(:finder_class) do
+    Class.new do
+      prepend FinderWithCrossProjectAccess
+      include FinderMethods
+
+      requires_cross_project_access if: -> { requires_access? }
+
+      attr_reader :current_user
+
+      def initialize(user)
+        @current_user = user
+      end
+
+      def execute
+        Issue.all
+      end
+    end
+  end
+
+  let(:user) { create(:user) }
+  subject(:finder) { finder_class.new(user) }
+  let!(:result) { create(:issue) }
+
+  before do
+    result.project.add_master(user)
+  end
+
+  def expect_access_check_on_result
+    expect(finder).not_to receive(:requires_access?)
+    expect(Ability).to receive(:allowed?).with(user, :read_issue, result).and_call_original
+  end
+
+  context 'when the user cannot read cross project' do
+    before do
+      allow(Ability).to receive(:allowed?).and_call_original
+      allow(Ability).to receive(:allowed?).with(user, :read_cross_project)
+                          .and_return(false)
+    end
+
+    describe '#execute' do
+      it 'returns a issue if the check is disabled' do
+        expect(finder).to receive(:requires_access?).and_return(false)
+
+        expect(finder.execute).to include(result)
+      end
+
+      it 'returns an empty relation when the check is enabled' do
+        expect(finder).to receive(:requires_access?).and_return(true)
+
+        expect(finder.execute).to be_empty
+      end
+
+      it 'only queries once when check is enabled' do
+        expect(finder).to receive(:requires_access?).and_return(true)
+
+        expect { finder.execute }.not_to exceed_query_limit(1)
+      end
+
+      it 'only queries once when check is disabled' do
+        expect(finder).to receive(:requires_access?).and_return(false)
+
+        expect { finder.execute }.not_to exceed_query_limit(1)
+      end
+    end
+
+    describe '#find' do
+      it 'checks the accessibility of the subject directly' do
+        expect_access_check_on_result
+
+        finder.find(result.id)
+      end
+
+      it 'returns the issue' do
+        expect(finder.find(result.id)).to eq(result)
+      end
+    end
+
+    describe '#find_by' do
+      it 'checks the accessibility of the subject directly' do
+        expect_access_check_on_result
+
+        finder.find_by(id: result.id)
+      end
+    end
+
+    describe '#find_by!' do
+      it 'checks the accessibility of the subject directly' do
+        expect_access_check_on_result
+
+        finder.find_by!(id: result.id)
+      end
+
+      it 're-enables the check after the find failed' do
+        finder.find_by!(id: 9999) rescue ActiveRecord::RecordNotFound
+
+        expect(finder.instance_variable_get(:@should_skip_cross_project_check))
+          .to eq(false)
+      end
+    end
+  end
+
+  context 'when the user can read cross project' do
+    before do
+      allow(Ability).to receive(:allowed?).and_call_original
+      allow(Ability).to receive(:allowed?).with(user, :read_cross_project)
+                          .and_return(true)
+    end
+
+    it 'returns the result' do
+      expect(finder).not_to receive(:requires_access?)
+
+      expect(finder.execute).to include(result)
+    end
+  end
+end
diff --git a/spec/finders/events_finder_spec.rb b/spec/finders/events_finder_spec.rb
index 18d6c0cfd74..62968e83292 100644
--- a/spec/finders/events_finder_spec.rb
+++ b/spec/finders/events_finder_spec.rb
@@ -26,6 +26,14 @@ describe EventsFinder do
 
       expect(events).not_to include(opened_merge_request_event)
     end
+
+    it 'returns nothing when the current user cannot read cross project' do
+      expect(Ability).to receive(:allowed?).with(user, :read_cross_project) { false }
+
+      events = described_class.new(source: user, current_user: user).execute
+
+      expect(events).to be_empty
+    end
   end
 
   context 'when targeting a project' do
diff --git a/spec/finders/milestones_finder_spec.rb b/spec/finders/milestones_finder_spec.rb
index 0b3cf7ece5f..656d120311a 100644
--- a/spec/finders/milestones_finder_spec.rb
+++ b/spec/finders/milestones_finder_spec.rb
@@ -70,4 +70,12 @@ describe MilestonesFinder do
       expect(result.to_a).to contain_exactly(milestone_1)
     end
   end
+
+  describe '#find_by' do
+    it 'finds a single milestone' do
+      finder = described_class.new(project_ids: [project_1.id], state: 'all')
+
+      expect(finder.find_by(iid: milestone_3.iid)).to eq(milestone_3)
+    end
+  end
 end
diff --git a/spec/finders/snippets_finder_spec.rb b/spec/finders/snippets_finder_spec.rb
index 54a07eccaba..1ae0bd988f2 100644
--- a/spec/finders/snippets_finder_spec.rb
+++ b/spec/finders/snippets_finder_spec.rb
@@ -162,8 +162,26 @@ describe SnippetsFinder do
     end
   end
 
-  describe "#execute" do
-    # Snippet visibility scenarios are included in more details in spec/support/snippet_visibility.rb
-    include_examples 'snippet visibility', described_class
+  describe '#execute' do
+    let(:project) { create(:project, :public) }
+    let!(:project_snippet) { create(:project_snippet, :public, project: project) }
+    let!(:personal_snippet) { create(:personal_snippet, :public) }
+    let(:user) { create(:user) }
+    subject(:finder) { described_class.new(user) }
+
+    it 'returns project- and personal snippets' do
+      expect(finder.execute).to contain_exactly(project_snippet, personal_snippet)
+    end
+
+    context 'when the user cannot read cross project' do
+      before do
+        allow(Ability).to receive(:allowed?).and_call_original
+        allow(Ability).to receive(:allowed?).with(user, :read_cross_project) { false }
+      end
+
+      it 'returns only personal snippets when the user cannot read cross project' do
+        expect(finder.execute).to contain_exactly(personal_snippet)
+      end
+    end
   end
 end
diff --git a/spec/finders/user_recent_events_finder_spec.rb b/spec/finders/user_recent_events_finder_spec.rb
new file mode 100644
index 00000000000..3ca0f7c3c89
--- /dev/null
+++ b/spec/finders/user_recent_events_finder_spec.rb
@@ -0,0 +1,31 @@
+require 'spec_helper'
+
+describe UserRecentEventsFinder do
+  let(:user) { create(:user) }
+  let(:project) { create(:project) }
+  let(:project_owner) { project.creator }
+  let!(:event) { create(:event, project: project, author: project_owner) }
+
+  subject(:finder) { described_class.new(user, project_owner) }
+
+  describe '#execute' do
+    it 'does not include the event when a user does not have access to the project' do
+      expect(finder.execute).to be_empty
+    end
+
+    context 'when the user has access to a project' do
+      before do
+        project.add_developer(user)
+      end
+
+      it 'includes the event' do
+        expect(finder.execute).to include(event)
+      end
+
+      it 'does not include the event if the user cannot read cross project' do
+        expect(Ability).to receive(:allowed?).with(user, :read_cross_project) { false }
+        expect(finder.execute).to be_empty
+      end
+    end
+  end
+end
diff --git a/spec/helpers/dashboard_helper_spec.rb b/spec/helpers/dashboard_helper_spec.rb
new file mode 100644
index 00000000000..7ba24ba2956
--- /dev/null
+++ b/spec/helpers/dashboard_helper_spec.rb
@@ -0,0 +1,24 @@
+require 'spec_helper'
+
+describe DashboardHelper do
+  let(:user) { build(:user) }
+
+  before do
+    allow(helper).to receive(:current_user).and_return(user)
+    allow(helper).to receive(:can?) { true }
+  end
+
+  describe '#dashboard_nav_links' do
+    it 'has all the expected links by default' do
+      menu_items = [:projects, :groups, :activity, :milestones, :snippets]
+
+      expect(helper.dashboard_nav_links).to contain_exactly(*menu_items)
+    end
+
+    it 'does not contain cross project elements when the user cannot read cross project' do
+      expect(helper).to receive(:can?).with(user, :read_cross_project) { false }
+
+      expect(helper.dashboard_nav_links).not_to include(:activity, :milestones)
+    end
+  end
+end
diff --git a/spec/helpers/explore_helper_spec.rb b/spec/helpers/explore_helper_spec.rb
new file mode 100644
index 00000000000..12651d80e36
--- /dev/null
+++ b/spec/helpers/explore_helper_spec.rb
@@ -0,0 +1,18 @@
+require 'spec_helper'
+
+describe ExploreHelper do
+  let(:user) { build(:user) }
+
+  before do
+    allow(helper).to receive(:current_user).and_return(user)
+    allow(helper).to receive(:can?) { true }
+  end
+
+  describe '#explore_nav_links' do
+    it 'has all the expected links by default' do
+      menu_items = [:projects, :groups, :snippets]
+
+      expect(helper.explore_nav_links).to contain_exactly(*menu_items)
+    end
+  end
+end
diff --git a/spec/helpers/groups_helper_spec.rb b/spec/helpers/groups_helper_spec.rb
index 5f608fe18d9..b48c252acd3 100644
--- a/spec/helpers/groups_helper_spec.rb
+++ b/spec/helpers/groups_helper_spec.rb
@@ -201,4 +201,39 @@ describe GroupsHelper do
       end
     end
   end
+
+  describe '#group_sidebar_links' do
+    let(:group) { create(:group, :public) }
+    let(:user) { create(:user) }
+    before do
+      allow(helper).to receive(:current_user) { user }
+      allow(helper).to receive(:can?) { true }
+      helper.instance_variable_set(:@group, group)
+    end
+
+    it 'returns all the expected links' do
+      links = [
+        :overview, :activity, :issues, :labels, :milestones, :merge_requests,
+        :group_members, :settings
+      ]
+
+      expect(helper.group_sidebar_links).to include(*links)
+    end
+
+    it 'includes settings when the user can admin the group' do
+      expect(helper).to receive(:current_user) { user }
+      expect(helper).to receive(:can?).with(user, :admin_group, group) { false }
+
+      expect(helper.group_sidebar_links).not_to include(:settings)
+    end
+
+    it 'excludes cross project features when the user cannot read cross project' do
+      cross_project_features = [:activity, :issues, :labels, :milestones,
+                                :merge_requests]
+
+      expect(helper).to receive(:can?).with(user, :read_cross_project) { false }
+
+      expect(helper.group_sidebar_links).not_to include(*cross_project_features)
+    end
+  end
 end
diff --git a/spec/helpers/issues_helper_spec.rb b/spec/helpers/issues_helper_spec.rb
index ddf881a7b6f..aeef5352333 100644
--- a/spec/helpers/issues_helper_spec.rb
+++ b/spec/helpers/issues_helper_spec.rb
@@ -113,21 +113,6 @@ describe IssuesHelper do
     end
   end
 
-  describe "milestone_options" do
-    it "gets closed milestone from current issue" do
-      closed_milestone = create(:closed_milestone, project: project)
-      milestone1       = create(:milestone, project: project)
-      milestone2       = create(:milestone, project: project)
-      issue.update_attributes(milestone_id: closed_milestone.id)
-
-      options = milestone_options(issue)
-
-      expect(options).to have_selector('option[selected]', text: closed_milestone.title)
-      expect(options).to have_selector('option', text: milestone1.title)
-      expect(options).to have_selector('option', text: milestone2.title)
-    end
-  end
-
   describe "#link_to_discussions_to_resolve" do
     describe "passing only a merge request" do
       let(:merge_request) { create(:merge_request) }
diff --git a/spec/helpers/nav_helper_spec.rb b/spec/helpers/nav_helper_spec.rb
new file mode 100644
index 00000000000..e840c927d59
--- /dev/null
+++ b/spec/helpers/nav_helper_spec.rb
@@ -0,0 +1,53 @@
+require 'spec_helper'
+
+describe NavHelper do
+  describe '#header_links' do
+    before do
+      allow(helper).to receive(:session) { {} }
+    end
+
+    context 'when the user is logged in' do
+      let(:user) { build(:user) }
+
+      before do
+        allow(helper).to receive(:current_user).and_return(user)
+        allow(helper).to receive(:can?) { true }
+      end
+
+      it 'has all the expected links by default' do
+        menu_items = [:user_dropdown, :search, :issues, :merge_requests, :todos]
+
+        expect(helper.header_links).to contain_exactly(*menu_items)
+      end
+
+      it 'contains the impersonation link while impersonating' do
+        expect(helper).to receive(:session) { { impersonator_id: 1 } }
+
+        expect(helper.header_links).to include(:admin_impersonation)
+      end
+
+      context 'when the user cannot read cross project' do
+        before do
+          allow(helper).to receive(:can?).with(user, :read_cross_project) { false }
+        end
+
+        it 'does not contain cross project elements when the user cannot read cross project' do
+          expect(helper.header_links).not_to include(:issues, :merge_requests, :todos, :search)
+        end
+
+        it 'shows the search box when the user cannot read cross project and he is visiting a project' do
+          helper.instance_variable_set(:@project, create(:project))
+
+          expect(helper.header_links).to include(:search)
+        end
+      end
+    end
+
+    it 'returns only the sign in and search when the user is not logged in' do
+      allow(helper).to receive(:current_user).and_return(nil)
+      allow(helper).to receive(:can?).with(nil, :read_cross_project) { true }
+
+      expect(helper.header_links).to contain_exactly(:sign_in, :search)
+    end
+  end
+end
diff --git a/spec/helpers/projects_helper_spec.rb b/spec/helpers/projects_helper_spec.rb
index b643a3590c8..ce96e90e2d7 100644
--- a/spec/helpers/projects_helper_spec.rb
+++ b/spec/helpers/projects_helper_spec.rb
@@ -75,6 +75,12 @@ describe ProjectsHelper do
 
   describe "#project_list_cache_key", :clean_gitlab_redis_shared_state do
     let(:project) { create(:project, :repository) }
+    let(:user) { create(:user) }
+
+    before do
+      allow(helper).to receive(:current_user).and_return(user)
+      allow(helper).to receive(:can?).with(user, :read_cross_project) { true }
+    end
 
     it "includes the route" do
       expect(helper.project_list_cache_key(project)).to include(project.route.cache_key)
@@ -106,6 +112,10 @@ describe ProjectsHelper do
       expect(helper.project_list_cache_key(project).last).to start_with('v')
     end
 
+    it 'includes wether or not the user can read cross project' do
+      expect(helper.project_list_cache_key(project)).to include('cross-project:true')
+    end
+
     it "includes the pipeline status when there is a status" do
       create(:ci_pipeline, :success, project: project, sha: project.commit.sha)
 
diff --git a/spec/helpers/users_helper_spec.rb b/spec/helpers/users_helper_spec.rb
index 03f78de8e91..6332217b920 100644
--- a/spec/helpers/users_helper_spec.rb
+++ b/spec/helpers/users_helper_spec.rb
@@ -14,4 +14,17 @@ describe UsersHelper do
       is_expected.to include("title=\"#{user.email}\"")
     end
   end
+
+  describe '#profile_tabs' do
+    subject(:tabs) { helper.profile_tabs }
+
+    before do
+      allow(helper).to receive(:current_user).and_return(user)
+      allow(helper).to receive(:can?).and_return(true)
+    end
+
+    it 'includes all the expected tabs' do
+      expect(tabs).to include(:activity, :groups, :contributed, :projects, :snippets)
+    end
+  end
 end
diff --git a/spec/lib/banzai/commit_renderer_spec.rb b/spec/lib/banzai/commit_renderer_spec.rb
index 84adaebdcbe..e7ebb2a332f 100644
--- a/spec/lib/banzai/commit_renderer_spec.rb
+++ b/spec/lib/banzai/commit_renderer_spec.rb
@@ -3,7 +3,7 @@ require 'spec_helper'
 describe Banzai::CommitRenderer do
   describe '.render' do
     it 'renders a commit description and title' do
-      user = double(:user)
+      user = build(:user)
       project = create(:project, :repository)
 
       expect(Banzai::ObjectRenderer).to receive(:new).with(project, user).and_call_original
diff --git a/spec/lib/banzai/filter/issuable_state_filter_spec.rb b/spec/lib/banzai/filter/issuable_state_filter_spec.rb
index cacb33d3372..17347768a49 100644
--- a/spec/lib/banzai/filter/issuable_state_filter_spec.rb
+++ b/spec/lib/banzai/filter/issuable_state_filter_spec.rb
@@ -77,6 +77,14 @@ describe Banzai::Filter::IssuableStateFilter do
     expect(doc.css('a').last.text).to eq("#{closed_issue.to_reference(other_project)} (closed)")
   end
 
+  it 'skips cross project references if the user cannot read cross project' do
+    expect(Ability).to receive(:allowed?).with(user, :read_cross_project) { false }
+    link = create_link(closed_issue.to_reference(other_project), issue: closed_issue.id, reference_type: 'issue')
+    doc = filter(link, context.merge(project: other_project))
+
+    expect(doc.css('a').last.text).to eq("#{closed_issue.to_reference(other_project)}")
+  end
+
   it 'does not append state when filter is not enabled' do
     link = create_link('text', issue: closed_issue.id, reference_type: 'issue')
     context = { current_user: user }
diff --git a/spec/lib/banzai/filter/redactor_filter_spec.rb b/spec/lib/banzai/filter/redactor_filter_spec.rb
index 5a7858e77f3..9a2e521fdcf 100644
--- a/spec/lib/banzai/filter/redactor_filter_spec.rb
+++ b/spec/lib/banzai/filter/redactor_filter_spec.rb
@@ -6,7 +6,7 @@ describe Banzai::Filter::RedactorFilter do
 
   it 'ignores non-GFM links' do
     html = %(See <a href="https://google.com/">Google</a>)
-    doc = filter(html, current_user: double)
+    doc = filter(html, current_user: build(:user))
 
     expect(doc.css('a').length).to eq 1
   end
diff --git a/spec/lib/banzai/redactor_spec.rb b/spec/lib/banzai/redactor_spec.rb
index 2424c3fdc66..1fa89137972 100644
--- a/spec/lib/banzai/redactor_spec.rb
+++ b/spec/lib/banzai/redactor_spec.rb
@@ -1,7 +1,7 @@
 require 'spec_helper'
 
 describe Banzai::Redactor do
-  let(:user) { build(:user) }
+  let(:user) { create(:user) }
   let(:project) { build(:project) }
   let(:redactor) { described_class.new(project, user) }
 
@@ -88,6 +88,55 @@ describe Banzai::Redactor do
     end
   end
 
+  context 'when the user cannot read cross project' do
+    include ActionView::Helpers::UrlHelper
+    let(:project) { create(:project) }
+    let(:other_project) { create(:project, :public) }
+
+    def create_link(issuable)
+      type = issuable.class.name.underscore.downcase
+      link_to(issuable.to_reference, '',
+              class: 'gfm has-tooltip',
+              title: issuable.title,
+              data: {
+                reference_type: type,
+                "#{type}": issuable.id
+              })
+    end
+
+    before do
+      project.add_developer(user)
+
+      allow(Ability).to receive(:allowed?).and_call_original
+      allow(Ability).to receive(:allowed?).with(user, :read_cross_project, :global) { false }
+      allow(Ability).to receive(:allowed?).with(user, :read_cross_project) { false }
+    end
+
+    it 'skips links to issues within the same project' do
+      issue = create(:issue, project: project)
+      link = create_link(issue)
+      doc = Nokogiri::HTML.fragment(link)
+
+      redactor.redact([doc])
+      result = doc.css('a').last
+
+      expect(result['class']).to include('has-tooltip')
+      expect(result['title']).to eq(issue.title)
+    end
+
+    it 'removes info from a cross project reference' do
+      issue = create(:issue, project: other_project)
+      link = create_link(issue)
+      doc = Nokogiri::HTML.fragment(link)
+
+      redactor.redact([doc])
+      result = doc.css('a').last
+
+      expect(result['class']).not_to include('has-tooltip')
+      expect(result['title']).to be_empty
+    end
+  end
+
   describe '#redact_nodes' do
     it 'redacts an Array of nodes' do
       doc = Nokogiri::HTML.fragment('<a href="foo">foo</a>')
diff --git a/spec/lib/banzai/reference_parser/issue_parser_spec.rb b/spec/lib/banzai/reference_parser/issue_parser_spec.rb
index 4cef3bdb24b..0a63567ee40 100644
--- a/spec/lib/banzai/reference_parser/issue_parser_spec.rb
+++ b/spec/lib/banzai/reference_parser/issue_parser_spec.rb
@@ -19,19 +19,58 @@ describe Banzai::ReferenceParser::IssueParser do
 
       it 'returns the nodes when the user can read the issue' do
         expect(Ability).to receive(:issues_readable_by_user)
-          .with([issue], user)
-          .and_return([issue])
+                             .with([issue], user)
+                             .and_return([issue])
 
         expect(subject.nodes_visible_to_user(user, [link])).to eq([link])
       end
 
       it 'returns an empty Array when the user can not read the issue' do
         expect(Ability).to receive(:issues_readable_by_user)
-          .with([issue], user)
-          .and_return([])
+                             .with([issue], user)
+                             .and_return([])
 
         expect(subject.nodes_visible_to_user(user, [link])).to eq([])
       end
+
+      context 'when the user cannot read cross project' do
+        let(:issue) { create(:issue) }
+
+        before do
+          allow(Ability).to receive(:allowed?).with(user, :read_cross_project) { false }
+          allow(Ability).to receive(:allowed?).with(user, :read_cross_project, :global) { false }
+        end
+
+        it 'returns the nodes when the user can read the issue' do
+          expect(Ability).to receive(:allowed?)
+                               .with(user, :read_issue_iid, issue)
+                               .and_return(true)
+
+          expect(subject.nodes_visible_to_user(user, [link])).to eq([link])
+        end
+
+        it 'returns an empty Array when the user can not read the issue' do
+          expect(Ability).to receive(:allowed?)
+                               .with(user, :read_issue_iid, issue)
+                               .and_return(false)
+
+          expect(subject.nodes_visible_to_user(user, [link])).to eq([])
+        end
+
+        context 'when the issue is not cross project' do
+          let(:issue) { create(:issue, project: project) }
+
+          it 'does not check `can_read_reference` if the issue is not cross project' do
+            expect(Ability).to receive(:issues_readable_by_user)
+                                 .with([issue], user)
+                                 .and_return([])
+
+            expect(subject).not_to receive(:can_read_reference?).with(user, issue)
+
+            expect(subject.nodes_visible_to_user(user, [link])).to eq([])
+          end
+        end
+      end
     end
 
     context 'when the link does not have a data-issue attribute' do
diff --git a/spec/lib/gitlab/contributions_calendar_spec.rb b/spec/lib/gitlab/contributions_calendar_spec.rb
index f1655854486..49a179ba875 100644
--- a/spec/lib/gitlab/contributions_calendar_spec.rb
+++ b/spec/lib/gitlab/contributions_calendar_spec.rb
@@ -118,6 +118,19 @@ describe Gitlab::ContributionsCalendar do
       expect(calendar.events_by_date(today)).to contain_exactly(e1)
       expect(calendar(contributor).events_by_date(today)).to contain_exactly(e1, e2, e3)
     end
+
+    context 'when the user cannot read read cross project' do
+      before do
+        allow(Ability).to receive(:allowed?).and_call_original
+        expect(Ability).to receive(:allowed?).with(user, :read_cross_project) { false }
+      end
+
+      it 'does not return any events' do
+        create_event(public_project, today)
+
+        expect(calendar(user).events_by_date(today)).to be_empty
+      end
+    end
   end
 
   describe '#starting_year' do
diff --git a/spec/lib/gitlab/cross_project_access/check_collection_spec.rb b/spec/lib/gitlab/cross_project_access/check_collection_spec.rb
new file mode 100644
index 00000000000..a9e7575240e
--- /dev/null
+++ b/spec/lib/gitlab/cross_project_access/check_collection_spec.rb
@@ -0,0 +1,55 @@
+require 'spec_helper'
+
+describe Gitlab::CrossProjectAccess::CheckCollection do
+  subject(:collection) { described_class.new }
+
+  describe '#add_collection' do
+    it 'merges the checks of 2 collections' do
+      initial_check = double('check')
+      collection.add_check(initial_check)
+
+      other_collection = described_class.new
+      other_check = double('other_check')
+      other_collection.add_check(other_check)
+
+      shared_check = double('shared check')
+      other_collection.add_check(shared_check)
+      collection.add_check(shared_check)
+
+      collection.add_collection(other_collection)
+
+      expect(collection.checks).to contain_exactly(initial_check, shared_check, other_check)
+    end
+  end
+
+  describe '#should_run?' do
+    def fake_check(run, skip)
+      check = double("Check: run=#{run} - skip={skip}")
+      allow(check).to receive(:should_run?).and_return(run)
+      allow(check).to receive(:should_skip?).and_return(skip)
+      allow(check).to receive(:skip).and_return(skip)
+
+      check
+    end
+
+    it 'returns true if one of the check says it should run' do
+      check = fake_check(true, false)
+      other_check = fake_check(false, false)
+
+      collection.add_check(check)
+      collection.add_check(other_check)
+
+      expect(collection.should_run?(double)).to be_truthy
+    end
+
+    it 'returns false if one of the check says it should be skipped' do
+      check = fake_check(true, false)
+      other_check = fake_check(false, true)
+
+      collection.add_check(check)
+      collection.add_check(other_check)
+
+      expect(collection.should_run?(double)).to be_falsey
+    end
+  end
+end
diff --git a/spec/lib/gitlab/cross_project_access/check_info_spec.rb b/spec/lib/gitlab/cross_project_access/check_info_spec.rb
new file mode 100644
index 00000000000..bc9dbf2bece
--- /dev/null
+++ b/spec/lib/gitlab/cross_project_access/check_info_spec.rb
@@ -0,0 +1,111 @@
+require 'spec_helper'
+
+describe Gitlab::CrossProjectAccess::CheckInfo do
+  let(:dummy_controller) { double }
+
+  before do
+    allow(dummy_controller).to receive(:action_name).and_return('index')
+  end
+
+  describe '#should_run?' do
+    it 'runs when an action is defined' do
+      info = described_class.new({ index: true }, nil, nil, false)
+
+      expect(info.should_run?(dummy_controller)).to be_truthy
+    end
+
+    it 'runs when the action is missing' do
+      info = described_class.new({}, nil, nil, false)
+
+      expect(info.should_run?(dummy_controller)).to be_truthy
+    end
+
+    it 'does not run when the action is excluded' do
+      info = described_class.new({ index: false }, nil, nil, false)
+
+      expect(info.should_run?(dummy_controller)).to be_falsy
+    end
+
+    it 'runs when the `if` conditional is true' do
+      info = described_class.new({}, -> { true }, nil, false)
+
+      expect(info.should_run?(dummy_controller)).to be_truthy
+    end
+
+    it 'does not run when the if condition is false' do
+      info = described_class.new({}, -> { false }, nil, false)
+
+      expect(info.should_run?(dummy_controller)).to be_falsy
+    end
+
+    it 'does not run when the `unless` check is true' do
+      info = described_class.new({}, nil, -> { true }, false)
+
+      expect(info.should_run?(dummy_controller)).to be_falsy
+    end
+
+    it 'runs when the `unless` check is false' do
+      info = described_class.new({}, nil, -> { false }, false)
+
+      expect(info.should_run?(dummy_controller)).to be_truthy
+    end
+
+    it 'returns the the oposite of #should_skip? when the check is a skip' do
+      info = described_class.new({}, nil, nil, true)
+
+      expect(info).to receive(:should_skip?).with(dummy_controller).and_return(false)
+      expect(info.should_run?(dummy_controller)).to be_truthy
+    end
+  end
+
+  describe '#should_skip?' do
+    it 'skips when an action is defined' do
+      info = described_class.new({ index: true }, nil, nil, true)
+
+      expect(info.should_skip?(dummy_controller)).to be_truthy
+    end
+
+    it 'does not skip when the action is not defined' do
+      info = described_class.new({}, nil, nil, true)
+
+      expect(info.should_skip?(dummy_controller)).to be_falsy
+    end
+
+    it 'does not skip when the action is excluded' do
+      info = described_class.new({ index: false }, nil, nil, true)
+
+      expect(info.should_skip?(dummy_controller)).to be_falsy
+    end
+
+    it 'skips when the `if` conditional is true' do
+      info = described_class.new({ index: true }, -> { true }, nil, true)
+
+      expect(info.should_skip?(dummy_controller)).to be_truthy
+    end
+
+    it 'does not skip the `if` conditional is false' do
+      info = described_class.new({ index: true }, -> { false }, nil, true)
+
+      expect(info.should_skip?(dummy_controller)).to be_falsy
+    end
+
+    it 'does not skip when the `unless` check is true' do
+      info = described_class.new({ index: true }, nil, -> { true }, true)
+
+      expect(info.should_skip?(dummy_controller)).to be_falsy
+    end
+
+    it 'skips when `unless` check is false' do
+      info = described_class.new({ index: true }, nil, -> { false }, true)
+
+      expect(info.should_skip?(dummy_controller)).to be_truthy
+    end
+
+    it 'returns the the oposite of #should_run? when the check is not a skip' do
+      info = described_class.new({}, nil, nil, false)
+
+      expect(info).to receive(:should_run?).with(dummy_controller).and_return(false)
+      expect(info.should_skip?(dummy_controller)).to be_truthy
+    end
+  end
+end
diff --git a/spec/lib/gitlab/cross_project_access/class_methods_spec.rb b/spec/lib/gitlab/cross_project_access/class_methods_spec.rb
new file mode 100644
index 00000000000..5349685e633
--- /dev/null
+++ b/spec/lib/gitlab/cross_project_access/class_methods_spec.rb
@@ -0,0 +1,46 @@
+require 'spec_helper'
+
+describe Gitlab::CrossProjectAccess::ClassMethods do
+  let(:dummy_class) do
+    Class.new do
+      extend Gitlab::CrossProjectAccess::ClassMethods
+    end
+  end
+  let(:dummy_proc) { lambda { false } }
+
+  describe '#requires_cross_project_access' do
+    it 'creates a correct check when a hash is passed' do
+      expect(Gitlab::CrossProjectAccess)
+        .to receive(:add_check).with(dummy_class,
+                                     actions: { hello: true, world: false },
+                                     positive_condition: dummy_proc,
+                                     negative_condition: dummy_proc)
+
+      dummy_class.requires_cross_project_access(
+        hello: true, world: false, if: dummy_proc, unless: dummy_proc
+      )
+    end
+
+    it 'creates a correct check when an array is passed' do
+      expect(Gitlab::CrossProjectAccess)
+        .to receive(:add_check).with(dummy_class,
+                                     actions: { hello: true, world: true },
+                                     positive_condition: nil,
+                                     negative_condition: nil)
+
+      dummy_class.requires_cross_project_access(:hello, :world)
+    end
+
+    it 'creates a correct check when an array and a hash is passed' do
+      expect(Gitlab::CrossProjectAccess)
+        .to receive(:add_check).with(dummy_class,
+                                     actions: { hello: true, world: true },
+                                     positive_condition: dummy_proc,
+                                     negative_condition: dummy_proc)
+
+      dummy_class.requires_cross_project_access(
+        :hello, :world, if: dummy_proc, unless: dummy_proc
+      )
+    end
+  end
+end
diff --git a/spec/lib/gitlab/cross_project_access_spec.rb b/spec/lib/gitlab/cross_project_access_spec.rb
new file mode 100644
index 00000000000..614b0473c7e
--- /dev/null
+++ b/spec/lib/gitlab/cross_project_access_spec.rb
@@ -0,0 +1,84 @@
+require 'spec_helper'
+
+describe Gitlab::CrossProjectAccess do
+  let(:super_class) { Class.new }
+  let(:descendant_class) { Class.new(super_class) }
+  let(:current_instance) { described_class.new }
+
+  before do
+    allow(described_class).to receive(:instance).and_return(current_instance)
+  end
+
+  describe '#add_check' do
+    it 'keeps track of the properties to check' do
+      expect do
+        described_class.add_check(super_class,
+                                  actions: { index: true },
+                                  positive_condition: -> { true },
+                                  negative_condition: -> { false })
+      end.to change { described_class.checks.size }.by(1)
+    end
+
+    it 'builds the check correctly' do
+      check_collection = described_class.add_check(super_class,
+                                                   actions: { index: true },
+                                                   positive_condition: -> { 'positive' },
+                                                   negative_condition: -> { 'negative' })
+
+      check = check_collection.checks.first
+
+      expect(check.actions).to eq(index: true)
+      expect(check.positive_condition.call).to eq('positive')
+      expect(check.negative_condition.call).to eq('negative')
+    end
+
+    it 'merges the checks of a parent class into existing checks of a subclass' do
+      subclass_collection = described_class.add_check(descendant_class)
+
+      expect(subclass_collection).to receive(:add_collection).and_call_original
+
+      described_class.add_check(super_class)
+    end
+
+    it 'merges the existing checks of a superclass into the checks of a subclass' do
+      super_collection = described_class.add_check(super_class)
+      descendant_collection = described_class.add_check(descendant_class)
+
+      expect(descendant_collection.checks).to include(*super_collection.checks)
+    end
+  end
+
+  describe '#find_check' do
+    it 'returns a check when it was defined for a superclass' do
+      expected_check = described_class.add_check(super_class,
+                                                 actions: { index: true },
+                                                 positive_condition: -> { 'positive' },
+                                                 negative_condition: -> { 'negative' })
+
+      expect(described_class.find_check(descendant_class.new))
+        .to eq(expected_check)
+    end
+
+    it 'caches the result for a subclass' do
+      described_class.add_check(super_class,
+                                actions: { index: true },
+                                positive_condition: -> { 'positive' },
+                                negative_condition: -> { 'negative' })
+
+      expect(described_class.instance).to receive(:closest_parent).once.and_call_original
+
+      2.times { described_class.find_check(descendant_class.new) }
+    end
+
+    it 'returns the checks for the closest class if there are more checks available' do
+      described_class.add_check(super_class,
+                                actions: { index: true })
+      expected_check = described_class.add_check(descendant_class,
+                                                 actions: { index: true, show: false })
+
+      check = described_class.find_check(descendant_class.new)
+
+      expect(check).to eq(expected_check)
+    end
+  end
+end
diff --git a/spec/models/ability_spec.rb b/spec/models/ability_spec.rb
index 38fb98d4f50..cd175dba6da 100644
--- a/spec/models/ability_spec.rb
+++ b/spec/models/ability_spec.rb
@@ -204,6 +204,78 @@ describe Ability do
     end
   end
 
+  describe '.merge_requests_readable_by_user' do
+    context 'with an admin' do
+      it 'returns all merge requests' do
+        user = build(:user, admin: true)
+        merge_request = build(:merge_request)
+
+        expect(described_class.merge_requests_readable_by_user([merge_request], user))
+          .to eq([merge_request])
+      end
+    end
+
+    context 'without a user' do
+      it 'returns merge_requests that are publicly visible' do
+        hidden_merge_request = build(:merge_request)
+        visible_merge_request = build(:merge_request, source_project: build(:project, :public))
+
+        merge_requests = described_class
+                           .merge_requests_readable_by_user([hidden_merge_request, visible_merge_request])
+
+        expect(merge_requests).to eq([visible_merge_request])
+      end
+    end
+
+    context 'with a user' do
+      let(:user) { create(:user) }
+      let(:project) { create(:project) }
+      let(:merge_request) { create(:merge_request, source_project: project) }
+      let(:cross_project_merge_request) do
+        create(:merge_request, source_project: create(:project, :public))
+      end
+      let(:other_merge_request) { create(:merge_request) }
+      let(:all_merge_requests) do
+        [merge_request, cross_project_merge_request, other_merge_request]
+      end
+
+      subject(:readable_merge_requests) do
+        described_class.merge_requests_readable_by_user(all_merge_requests, user)
+      end
+
+      before do
+        project.add_developer(user)
+      end
+
+      it 'returns projects visible to the user' do
+        expect(readable_merge_requests).to contain_exactly(merge_request, cross_project_merge_request)
+      end
+
+      context 'when a user cannot read cross project and a filter is passed' do
+        before do
+          allow(described_class).to receive(:allowed?).and_call_original
+          expect(described_class).to receive(:allowed?).with(user, :read_cross_project) { false }
+        end
+
+        subject(:readable_merge_requests) do
+          read_cross_project_filter = -> (merge_requests) do
+            merge_requests.select { |mr| mr.source_project == project }
+          end
+          described_class.merge_requests_readable_by_user(
+            all_merge_requests, user,
+            filters: { read_cross_project: read_cross_project_filter }
+          )
+        end
+
+        it 'returns only MRs of the specified project without checking access on others' do
+          expect(described_class).not_to receive(:allowed?).with(user, :read_merge_request, cross_project_merge_request)
+
+          expect(readable_merge_requests).to contain_exactly(merge_request)
+        end
+      end
+    end
+  end
+
   describe '.issues_readable_by_user' do
     context 'with an admin user' do
       it 'returns all given issues' do
@@ -250,6 +322,29 @@ describe Ability do
         expect(issues).to eq([visible_issue])
       end
     end
+
+    context 'when the user cannot read cross project' do
+      let(:user) { create(:user) }
+      let(:issue) { create(:issue) }
+      let(:other_project_issue) { create(:issue) }
+      let(:project) { issue.project }
+
+      before do
+        project.add_developer(user)
+
+        allow(described_class).to receive(:allowed?).and_call_original
+        allow(described_class).to receive(:allowed?).with(user, :read_cross_project, any_args) { false }
+      end
+
+      it 'excludes issues from other projects whithout checking separatly when passing a scope' do
+        expect(described_class).not_to receive(:allowed?).with(user, :read_issue, other_project_issue)
+
+        filters = { read_cross_project: -> (issues) { issues.where(project: project) } }
+        result = described_class.issues_readable_by_user(Issue.all, user, filters: filters)
+
+        expect(result).to contain_exactly(issue)
+      end
+    end
   end
 
   describe '.project_disabled_features_rules' do
diff --git a/spec/models/concerns/protected_ref_access_spec.rb b/spec/models/concerns/protected_ref_access_spec.rb
new file mode 100644
index 00000000000..a62ca391e25
--- /dev/null
+++ b/spec/models/concerns/protected_ref_access_spec.rb
@@ -0,0 +1,31 @@
+require 'spec_helper'
+
+describe ProtectedRefAccess do
+  subject(:protected_ref_access) do
+    create(:protected_branch, :masters_can_push).push_access_levels.first
+  end
+
+  let(:project) { protected_ref_access.project }
+
+  describe '#check_access' do
+    it 'is always true for admins' do
+      admin = create(:admin)
+
+      expect(protected_ref_access.check_access(admin)).to be_truthy
+    end
+
+    it 'is true for masters' do
+      master = create(:user)
+      project.add_master(master)
+
+      expect(protected_ref_access.check_access(master)).to be_truthy
+    end
+
+    it 'is for developers of the project' do
+      developer = create(:user)
+      project.add_developer(developer)
+
+      expect(protected_ref_access.check_access(developer)).to be_falsy
+    end
+  end
+end
diff --git a/spec/models/issue_spec.rb b/spec/models/issue_spec.rb
index f5c9f551e65..feed7968f09 100644
--- a/spec/models/issue_spec.rb
+++ b/spec/models/issue_spec.rb
@@ -221,27 +221,55 @@ describe Issue do
   end
 
   describe '#referenced_merge_requests' do
-    it 'returns the referenced merge requests' do
-      project = create(:project, :public)
-
-      mr1 = create(:merge_request,
-                   source_project: project,
-                   source_branch:  'master',
-                   target_branch:  'feature')
+    let(:project) { create(:project, :public) }
+    let(:issue) do
+      create(:issue, description: merge_request.to_reference, project: project)
+    end
+    let!(:merge_request) do
+      create(:merge_request,
+             source_project: project,
+             source_branch:  'master',
+             target_branch:  'feature')
+    end
 
+    it 'returns the referenced merge requests' do
       mr2 = create(:merge_request,
                    source_project: project,
                    source_branch:  'feature',
                    target_branch:  'master')
 
-      issue = create(:issue, description: mr1.to_reference, project: project)
-
       create(:note_on_issue,
              noteable:   issue,
              note:       mr2.to_reference,
              project_id: project.id)
 
-      expect(issue.referenced_merge_requests).to eq([mr1, mr2])
+      expect(issue.referenced_merge_requests).to eq([merge_request, mr2])
+    end
+
+    it 'returns cross project referenced merge requests' do
+      other_project = create(:project, :public)
+      cross_project_merge_request = create(:merge_request, source_project: other_project)
+      create(:note_on_issue,
+             noteable:   issue,
+             note:       cross_project_merge_request.to_reference(issue.project),
+             project_id: issue.project.id)
+
+      expect(issue.referenced_merge_requests).to eq([merge_request, cross_project_merge_request])
+    end
+
+    it 'excludes cross project references if the user cannot read cross project' do
+      user = create(:user)
+      allow(Ability).to receive(:allowed?).and_call_original
+      expect(Ability).to receive(:allowed?).with(user, :read_cross_project) { false }
+
+      other_project = create(:project, :public)
+      cross_project_merge_request = create(:merge_request, source_project: other_project)
+      create(:note_on_issue,
+             noteable:   issue,
+             note:       cross_project_merge_request.to_reference(issue.project),
+             project_id: issue.project.id)
+
+      expect(issue.referenced_merge_requests(user)).to eq([merge_request])
     end
   end
 
@@ -309,7 +337,7 @@ describe Issue do
   end
 
   describe '#related_branches' do
-    let(:user) { build(:admin) }
+    let(:user) { create(:admin) }
 
     before do
       allow(subject.project.repository).to receive(:branch_names)
diff --git a/spec/models/notification_recipient_spec.rb b/spec/models/notification_recipient_spec.rb
new file mode 100644
index 00000000000..eda0e1da835
--- /dev/null
+++ b/spec/models/notification_recipient_spec.rb
@@ -0,0 +1,16 @@
+require 'spec_helper'
+
+describe NotificationRecipient do
+  let(:user) { create(:user) }
+  let(:project) { create(:project, namespace: user.namespace) }
+  let(:target) { create(:issue, project: project) }
+
+  subject(:recipient) { described_class.new(user, :watch, target: target, project: project) }
+
+  it 'denies access to a target when cross project access is denied' do
+    allow(Ability).to receive(:allowed?).and_call_original
+    expect(Ability).to receive(:allowed?).with(user, :read_cross_project, :global).and_return(false)
+
+    expect(recipient.has_access?).to be_falsy
+  end
+end
diff --git a/spec/models/project_spec.rb b/spec/models/project_spec.rb
index ee04d74d848..56c2d7b953e 100644
--- a/spec/models/project_spec.rb
+++ b/spec/models/project_spec.rb
@@ -1473,6 +1473,13 @@ describe Project do
 
       expect(project.user_can_push_to_empty_repo?(user)).to be_truthy
     end
+
+    it 'returns false when the repo is not empty' do
+      project.add_master(user)
+      expect(project).to receive(:empty_repo?).and_return(false)
+
+      expect(project.user_can_push_to_empty_repo?(user)).to be_falsey
+    end
   end
 
   describe '#container_registry_url' do
diff --git a/spec/policies/issuable_policy_spec.rb b/spec/policies/issuable_policy_spec.rb
index 2cf669e8191..d1bf98995e7 100644
--- a/spec/policies/issuable_policy_spec.rb
+++ b/spec/policies/issuable_policy_spec.rb
@@ -1,12 +1,14 @@
 require 'spec_helper'
 
 describe IssuablePolicy, models: true do
+  let(:user) { create(:user) }
+  let(:project) { create(:project, :public) }
+  let(:issue) { create(:issue, project: project) }
+  let(:policies) { described_class.new(user, issue) }
+
   describe '#rules' do
     context 'when discussion is locked for the issuable' do
-      let(:user) { create(:user) }
-      let(:project) { create(:project, :public) }
       let(:issue) { create(:issue, project: project, discussion_locked: true) }
-      let(:policies) { described_class.new(user, issue) }
 
       context 'when the user is not a project member' do
         it 'can not create a note' do
diff --git a/spec/policies/issue_policy_spec.rb b/spec/policies/issue_policy_spec.rb
index a4af9361ea6..793b724bfca 100644
--- a/spec/policies/issue_policy_spec.rb
+++ b/spec/policies/issue_policy_spec.rb
@@ -30,41 +30,41 @@ describe IssuePolicy do
     end
 
     it 'does not allow non-members to read issues' do
-      expect(permissions(non_member, issue)).to be_disallowed(:read_issue, :update_issue, :admin_issue)
-      expect(permissions(non_member, issue_no_assignee)).to be_disallowed(:read_issue, :update_issue, :admin_issue)
+      expect(permissions(non_member, issue)).to be_disallowed(:read_issue, :read_issue_iid, :update_issue, :admin_issue)
+      expect(permissions(non_member, issue_no_assignee)).to be_disallowed(:read_issue, :read_issue_iid, :update_issue, :admin_issue)
     end
 
     it 'allows guests to read issues' do
-      expect(permissions(guest, issue)).to be_allowed(:read_issue)
+      expect(permissions(guest, issue)).to be_allowed(:read_issue, :read_issue_iid)
       expect(permissions(guest, issue)).to be_disallowed(:update_issue, :admin_issue)
 
-      expect(permissions(guest, issue_no_assignee)).to be_allowed(:read_issue)
+      expect(permissions(guest, issue_no_assignee)).to be_allowed(:read_issue, :read_issue_iid)
       expect(permissions(guest, issue_no_assignee)).to be_disallowed(:update_issue, :admin_issue)
     end
 
     it 'allows reporters to read, update, and admin issues' do
-      expect(permissions(reporter, issue)).to be_allowed(:read_issue, :update_issue, :admin_issue)
-      expect(permissions(reporter, issue_no_assignee)).to be_allowed(:read_issue, :update_issue, :admin_issue)
+      expect(permissions(reporter, issue)).to be_allowed(:read_issue, :read_issue_iid, :update_issue, :admin_issue)
+      expect(permissions(reporter, issue_no_assignee)).to be_allowed(:read_issue, :read_issue_iid, :update_issue, :admin_issue)
     end
 
     it 'allows reporters from group links to read, update, and admin issues' do
-      expect(permissions(reporter_from_group_link, issue)).to be_allowed(:read_issue, :update_issue, :admin_issue)
-      expect(permissions(reporter_from_group_link, issue_no_assignee)).to be_allowed(:read_issue, :update_issue, :admin_issue)
+      expect(permissions(reporter_from_group_link, issue)).to be_allowed(:read_issue, :read_issue_iid, :update_issue, :admin_issue)
+      expect(permissions(reporter_from_group_link, issue_no_assignee)).to be_allowed(:read_issue, :read_issue_iid, :update_issue, :admin_issue)
     end
 
     it 'allows issue authors to read and update their issues' do
-      expect(permissions(author, issue)).to be_allowed(:read_issue, :update_issue)
+      expect(permissions(author, issue)).to be_allowed(:read_issue, :read_issue_iid, :update_issue)
       expect(permissions(author, issue)).to be_disallowed(:admin_issue)
 
-      expect(permissions(author, issue_no_assignee)).to be_allowed(:read_issue)
+      expect(permissions(author, issue_no_assignee)).to be_allowed(:read_issue, :read_issue_iid)
       expect(permissions(author, issue_no_assignee)).to be_disallowed(:update_issue, :admin_issue)
     end
 
     it 'allows issue assignees to read and update their issues' do
-      expect(permissions(assignee, issue)).to be_allowed(:read_issue, :update_issue)
+      expect(permissions(assignee, issue)).to be_allowed(:read_issue, :read_issue_iid, :update_issue)
       expect(permissions(assignee, issue)).to be_disallowed(:admin_issue)
 
-      expect(permissions(assignee, issue_no_assignee)).to be_allowed(:read_issue)
+      expect(permissions(assignee, issue_no_assignee)).to be_allowed(:read_issue, :read_issue_iid)
       expect(permissions(assignee, issue_no_assignee)).to be_disallowed(:update_issue, :admin_issue)
     end
 
@@ -73,37 +73,37 @@ describe IssuePolicy do
       let(:confidential_issue_no_assignee) { create(:issue, :confidential, project: project) }
 
       it 'does not allow non-members to read confidential issues' do
-        expect(permissions(non_member, confidential_issue)).to be_disallowed(:read_issue, :update_issue, :admin_issue)
-        expect(permissions(non_member, confidential_issue_no_assignee)).to be_disallowed(:read_issue, :update_issue, :admin_issue)
+        expect(permissions(non_member, confidential_issue)).to be_disallowed(:read_issue, :read_issue_iid, :update_issue, :admin_issue)
+        expect(permissions(non_member, confidential_issue_no_assignee)).to be_disallowed(:read_issue, :read_issue_iid, :update_issue, :admin_issue)
       end
 
       it 'does not allow guests to read confidential issues' do
-        expect(permissions(guest, confidential_issue)).to be_disallowed(:read_issue, :update_issue, :admin_issue)
-        expect(permissions(guest, confidential_issue_no_assignee)).to be_disallowed(:read_issue, :update_issue, :admin_issue)
+        expect(permissions(guest, confidential_issue)).to be_disallowed(:read_issue, :read_issue_iid, :update_issue, :admin_issue)
+        expect(permissions(guest, confidential_issue_no_assignee)).to be_disallowed(:read_issue, :read_issue_iid, :update_issue, :admin_issue)
       end
 
       it 'allows reporters to read, update, and admin confidential issues' do
-        expect(permissions(reporter, confidential_issue)).to be_allowed(:read_issue, :update_issue, :admin_issue)
-        expect(permissions(reporter, confidential_issue_no_assignee)).to be_allowed(:read_issue, :update_issue, :admin_issue)
+        expect(permissions(reporter, confidential_issue)).to be_allowed(:read_issue, :read_issue_iid, :update_issue, :admin_issue)
+        expect(permissions(reporter, confidential_issue_no_assignee)).to be_allowed(:read_issue, :read_issue_iid, :update_issue, :admin_issue)
       end
 
       it 'allows reporters from group links to read, update, and admin confidential issues' do
-        expect(permissions(reporter_from_group_link, confidential_issue)).to be_allowed(:read_issue, :update_issue, :admin_issue)
-        expect(permissions(reporter_from_group_link, confidential_issue_no_assignee)).to be_allowed(:read_issue, :update_issue, :admin_issue)
+        expect(permissions(reporter_from_group_link, confidential_issue)).to be_allowed(:read_issue, :read_issue_iid, :update_issue, :admin_issue)
+        expect(permissions(reporter_from_group_link, confidential_issue_no_assignee)).to be_allowed(:read_issue, :read_issue_iid, :update_issue, :admin_issue)
       end
 
       it 'allows issue authors to read and update their confidential issues' do
-        expect(permissions(author, confidential_issue)).to be_allowed(:read_issue, :update_issue)
+        expect(permissions(author, confidential_issue)).to be_allowed(:read_issue, :read_issue_iid, :update_issue)
         expect(permissions(author, confidential_issue)).to be_disallowed(:admin_issue)
 
-        expect(permissions(author, confidential_issue_no_assignee)).to be_disallowed(:read_issue, :update_issue, :admin_issue)
+        expect(permissions(author, confidential_issue_no_assignee)).to be_disallowed(:read_issue, :read_issue_iid, :update_issue, :admin_issue)
       end
 
       it 'allows issue assignees to read and update their confidential issues' do
-        expect(permissions(assignee, confidential_issue)).to be_allowed(:read_issue, :update_issue)
+        expect(permissions(assignee, confidential_issue)).to be_allowed(:read_issue, :read_issue_iid, :update_issue)
         expect(permissions(assignee, confidential_issue)).to be_disallowed(:admin_issue)
 
-        expect(permissions(assignee, confidential_issue_no_assignee)).to be_disallowed(:read_issue, :update_issue, :admin_issue)
+        expect(permissions(assignee, confidential_issue_no_assignee)).to be_disallowed(:read_issue, :read_issue_iid, :update_issue, :admin_issue)
       end
     end
   end
@@ -123,36 +123,36 @@ describe IssuePolicy do
     end
 
     it 'allows guests to read issues' do
-      expect(permissions(guest, issue)).to be_allowed(:read_issue)
+      expect(permissions(guest, issue)).to be_allowed(:read_issue, :read_issue_iid)
       expect(permissions(guest, issue)).to be_disallowed(:update_issue, :admin_issue)
 
-      expect(permissions(guest, issue_no_assignee)).to be_allowed(:read_issue)
+      expect(permissions(guest, issue_no_assignee)).to be_allowed(:read_issue, :read_issue_iid)
       expect(permissions(guest, issue_no_assignee)).to be_disallowed(:update_issue, :admin_issue)
     end
 
     it 'allows reporters to read, update, and admin issues' do
-      expect(permissions(reporter, issue)).to be_allowed(:read_issue, :update_issue, :admin_issue)
-      expect(permissions(reporter, issue_no_assignee)).to be_allowed(:read_issue, :update_issue, :admin_issue)
+      expect(permissions(reporter, issue)).to be_allowed(:read_issue, :read_issue_iid, :update_issue, :admin_issue)
+      expect(permissions(reporter, issue_no_assignee)).to be_allowed(:read_issue, :read_issue_iid, :update_issue, :admin_issue)
     end
 
     it 'allows reporters from group links to read, update, and admin issues' do
-      expect(permissions(reporter_from_group_link, issue)).to be_allowed(:read_issue, :update_issue, :admin_issue)
-      expect(permissions(reporter_from_group_link, issue_no_assignee)).to be_allowed(:read_issue, :update_issue, :admin_issue)
+      expect(permissions(reporter_from_group_link, issue)).to be_allowed(:read_issue, :read_issue_iid, :update_issue, :admin_issue)
+      expect(permissions(reporter_from_group_link, issue_no_assignee)).to be_allowed(:read_issue, :read_issue_iid, :update_issue, :admin_issue)
     end
 
     it 'allows issue authors to read and update their issues' do
-      expect(permissions(author, issue)).to be_allowed(:read_issue, :update_issue)
+      expect(permissions(author, issue)).to be_allowed(:read_issue, :read_issue_iid, :update_issue)
       expect(permissions(author, issue)).to be_disallowed(:admin_issue)
 
-      expect(permissions(author, issue_no_assignee)).to be_allowed(:read_issue)
+      expect(permissions(author, issue_no_assignee)).to be_allowed(:read_issue, :read_issue_iid)
       expect(permissions(author, issue_no_assignee)).to be_disallowed(:update_issue, :admin_issue)
     end
 
     it 'allows issue assignees to read and update their issues' do
-      expect(permissions(assignee, issue)).to be_allowed(:read_issue, :update_issue)
+      expect(permissions(assignee, issue)).to be_allowed(:read_issue, :read_issue_iid, :update_issue)
       expect(permissions(assignee, issue)).to be_disallowed(:admin_issue)
 
-      expect(permissions(assignee, issue_no_assignee)).to be_allowed(:read_issue)
+      expect(permissions(assignee, issue_no_assignee)).to be_allowed(:read_issue, :read_issue_iid)
       expect(permissions(assignee, issue_no_assignee)).to be_disallowed(:update_issue, :admin_issue)
     end
 
@@ -161,32 +161,32 @@ describe IssuePolicy do
       let(:confidential_issue_no_assignee) { create(:issue, :confidential, project: project) }
 
       it 'does not allow guests to read confidential issues' do
-        expect(permissions(guest, confidential_issue)).to be_disallowed(:read_issue, :update_issue, :admin_issue)
-        expect(permissions(guest, confidential_issue_no_assignee)).to be_disallowed(:read_issue, :update_issue, :admin_issue)
+        expect(permissions(guest, confidential_issue)).to be_disallowed(:read_issue, :read_issue_iid, :update_issue, :admin_issue)
+        expect(permissions(guest, confidential_issue_no_assignee)).to be_disallowed(:read_issue, :read_issue_iid, :update_issue, :admin_issue)
       end
 
       it 'allows reporters to read, update, and admin confidential issues' do
-        expect(permissions(reporter, confidential_issue)).to be_allowed(:read_issue, :update_issue, :admin_issue)
-        expect(permissions(reporter, confidential_issue_no_assignee)).to be_allowed(:read_issue, :update_issue, :admin_issue)
+        expect(permissions(reporter, confidential_issue)).to be_allowed(:read_issue, :read_issue_iid, :update_issue, :admin_issue)
+        expect(permissions(reporter, confidential_issue_no_assignee)).to be_allowed(:read_issue, :read_issue_iid, :update_issue, :admin_issue)
       end
 
       it 'allows reporter from group links to read, update, and admin confidential issues' do
-        expect(permissions(reporter_from_group_link, confidential_issue)).to be_allowed(:read_issue, :update_issue, :admin_issue)
-        expect(permissions(reporter_from_group_link, confidential_issue_no_assignee)).to be_allowed(:read_issue, :update_issue, :admin_issue)
+        expect(permissions(reporter_from_group_link, confidential_issue)).to be_allowed(:read_issue, :read_issue_iid, :update_issue, :admin_issue)
+        expect(permissions(reporter_from_group_link, confidential_issue_no_assignee)).to be_allowed(:read_issue, :read_issue_iid, :update_issue, :admin_issue)
       end
 
       it 'allows issue authors to read and update their confidential issues' do
-        expect(permissions(author, confidential_issue)).to be_allowed(:read_issue, :update_issue)
+        expect(permissions(author, confidential_issue)).to be_allowed(:read_issue, :read_issue_iid, :update_issue)
         expect(permissions(author, confidential_issue)).to be_disallowed(:admin_issue)
 
-        expect(permissions(author, confidential_issue_no_assignee)).to be_disallowed(:read_issue, :update_issue, :admin_issue)
+        expect(permissions(author, confidential_issue_no_assignee)).to be_disallowed(:read_issue, :read_issue_iid, :update_issue, :admin_issue)
       end
 
       it 'allows issue assignees to read and update their confidential issues' do
-        expect(permissions(assignee, confidential_issue)).to be_allowed(:read_issue, :update_issue)
+        expect(permissions(assignee, confidential_issue)).to be_allowed(:read_issue, :read_issue_iid, :update_issue)
         expect(permissions(assignee, confidential_issue)).to be_disallowed(:admin_issue)
 
-        expect(permissions(assignee, confidential_issue_no_assignee)).to be_disallowed(:read_issue, :update_issue, :admin_issue)
+        expect(permissions(assignee, confidential_issue_no_assignee)).to be_disallowed(:read_issue, :read_issue_iid, :update_issue, :admin_issue)
       end
     end
   end
diff --git a/spec/services/merge_requests/create_from_issue_service_spec.rb b/spec/services/merge_requests/create_from_issue_service_spec.rb
index 75553afc033..38d84cf0ceb 100644
--- a/spec/services/merge_requests/create_from_issue_service_spec.rb
+++ b/spec/services/merge_requests/create_from_issue_service_spec.rb
@@ -24,7 +24,7 @@ describe MergeRequests::CreateFromIssueService do
     end
 
     it 'delegates issue search to IssuesFinder' do
-      expect_any_instance_of(IssuesFinder).to receive(:execute).once.and_call_original
+      expect_any_instance_of(IssuesFinder).to receive(:find_by).once.and_call_original
 
       described_class.new(project, user, issue_iid: -1).execute
     end
diff --git a/spec/services/todo_service_spec.rb b/spec/services/todo_service_spec.rb
index 5e6c24f5730..562b89e6767 100644
--- a/spec/services/todo_service_spec.rb
+++ b/spec/services/todo_service_spec.rb
@@ -943,7 +943,8 @@ describe TodoService do
 
       described_class.new.mark_todos_as_done_by_ids(todo, john_doe)
 
-      expect_any_instance_of(TodosFinder).not_to receive(:execute)
+      # Make sure no TodosFinder is inialized to perform counting
+      expect(TodosFinder).not_to receive(:new)
 
       expect(john_doe.todos_done_count).to eq(1)
       expect(john_doe.todos_pending_count).to eq(1)
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index 5600c9c6ad5..c0f3366fb52 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -185,6 +185,14 @@ RSpec.configure do |config|
   config.around(:each, :postgresql) do |example|
     example.run if Gitlab::Database.postgresql?
   end
+
+  # This makes sure the `ApplicationController#can?` method is stubbed with the
+  # original implementation for all view specs.
+  config.before(:each, type: :view) do
+    allow(view).to receive(:can?) do |*args|
+      Ability.allowed?(*args)
+    end
+  end
 end
 
 # add simpler way to match asset paths containing digest strings
diff --git a/spec/support/snippet_visibility.rb b/spec/support/snippet_visibility.rb
index 1cb904823d2..3a7c69b7877 100644
--- a/spec/support/snippet_visibility.rb
+++ b/spec/support/snippet_visibility.rb
@@ -252,6 +252,15 @@ RSpec.shared_examples 'snippet visibility' do
           results = described_class.new(user).execute
           expect(results.include?(snippet)).to eq(outcome)
         end
+
+        it 'returns no snippets when the user cannot read cross project' do
+          allow(Ability).to receive(:allowed?).and_call_original
+          allow(Ability).to receive(:allowed?).with(user, :read_cross_project) { false }
+
+          snippets = described_class.new(user).execute
+
+          expect(snippets).to be_empty
+        end
       end
     end
   end
@@ -298,6 +307,15 @@ RSpec.shared_examples 'snippet visibility' do
           results = described_class.new(user).execute
           expect(results.include?(snippet)).to eq(outcome)
         end
+
+        it 'should return personal snippets when the user cannot read cross project' do
+          allow(Ability).to receive(:allowed?).and_call_original
+          allow(Ability).to receive(:allowed?).with(user, :read_cross_project) { false }
+
+          results = described_class.new(user).execute
+
+          expect(results.include?(snippet)).to eq(outcome)
+        end
       end
     end
   end
diff --git a/spec/views/shared/projects/_project.html.haml_spec.rb b/spec/views/shared/projects/_project.html.haml_spec.rb
index f0a4f153699..3b14045e61f 100644
--- a/spec/views/shared/projects/_project.html.haml_spec.rb
+++ b/spec/views/shared/projects/_project.html.haml_spec.rb
@@ -5,6 +5,7 @@ describe 'shared/projects/_project.html.haml' do
 
   before do
     allow(view).to receive(:current_application_settings).and_return(Gitlab::CurrentSettings.current_application_settings)
+    allow(view).to receive(:can?) { true }
   end
 
   it 'should render creator avatar if project has a creator' do