4 files changed, 81 insertions, 1 deletions

diff --git a/spec/helpers/merge_requests_helper_spec.rb b/spec/helpers/merge_requests_helper_spec.rb
index e9037749ef2..10681af5f7e 100644
--- a/spec/helpers/merge_requests_helper_spec.rb
+++ b/spec/helpers/merge_requests_helper_spec.rb
@@ -64,7 +64,7 @@ describe MergeRequestsHelper do
 
       it do
         @project = project
-        
+
         is_expected.to eq("#1, #2, and #{other_project.namespace.path}/#{other_project.path}#3")
       end
     end
@@ -149,6 +149,50 @@ describe MergeRequestsHelper do
     end
   end
 
+  describe '#target_projects' do
+    let(:project) { create(:empty_project) }
+    let(:fork_project) { create(:empty_project, forked_from_project: project) }
+
+    context 'when target project has enabled merge requests' do
+      it 'returns the forked_from project' do
+        expect(target_projects(fork_project)).to contain_exactly(project, fork_project)
+      end
+    end
+
+    context 'when target project has disabled merge requests' do
+      it 'returns the forked project' do
+        project.project_feature.update(merge_requests_access_level: 0)
+
+        expect(target_projects(fork_project)).to contain_exactly(fork_project)
+      end
+    end
+  end
+
+  describe '#new_mr_path_from_push_event' do
+    subject(:url_params) { URI.decode_www_form(new_mr_path_from_push_event(event)).to_h }
+    let(:user) { create(:user) }
+    let(:project) { create(:empty_project, creator: user) }
+    let(:fork_project) { create(:project, forked_from_project: project, creator: user) }
+    let(:event) do
+      push_data = Gitlab::DataBuilder::Push.build_sample(fork_project, user)
+      create(:event, :pushed, project: fork_project, target: fork_project, author: user, data: push_data)
+    end
+
+    context 'when target project has enabled merge requests' do
+      it 'returns link to create merge request on source project' do
+        expect(url_params['merge_request[target_project_id]'].to_i).to eq(project.id)
+      end
+    end
+
+    context 'when target project has disabled merge requests' do
+      it 'returns link to create merge request on forked project' do
+        project.project_feature.update(merge_requests_access_level: 0)
+
+        expect(url_params['merge_request[target_project_id]'].to_i).to eq(fork_project.id)
+      end
+    end
+  end
+
   describe '#mr_issues_mentioned_but_not_closing' do
     let(:user_1) { create(:user) }
     let(:user_2) { create(:user) }
diff --git a/spec/requests/api/merge_requests_spec.rb b/spec/requests/api/merge_requests_spec.rb
index c4bff1647b5..16e5efb2f5b 100644
--- a/spec/requests/api/merge_requests_spec.rb
+++ b/spec/requests/api/merge_requests_spec.rb
@@ -434,6 +434,19 @@ describe API::MergeRequests do
         expect(json_response['title']).to eq('Test merge_request')
       end
 
+      it 'returns 422 when target project has disabled merge requests' do
+        project.project_feature.update(merge_requests_access_level: 0)
+
+        post api("/projects/#{fork_project.id}/merge_requests", user2),
+             title: 'Test',
+             target_branch: 'master',
+             source_branch: 'markdown',
+             author: user2,
+             target_project_id: project.id
+
+        expect(response).to have_http_status(422)
+      end
+
       it "returns 400 when source_branch is missing" do
         post api("/projects/#{fork_project.id}/merge_requests", user2),
         title: 'Test merge_request', target_branch: "master", author: user2, target_project_id: project.id
diff --git a/spec/requests/api/v3/merge_requests_spec.rb b/spec/requests/api/v3/merge_requests_spec.rb
index 6c2950a6e6f..f6ff96be566 100644
--- a/spec/requests/api/v3/merge_requests_spec.rb
+++ b/spec/requests/api/v3/merge_requests_spec.rb
@@ -338,6 +338,19 @@ describe API::MergeRequests do
         expect(json_response['title']).to eq('Test merge_request')
       end
 
+      it "returns 422 when target project has disabled merge requests" do
+        project.project_feature.update(merge_requests_access_level: 0)
+
+        post v3_api("/projects/#{fork_project.id}/merge_requests", user2),
+             title: 'Test',
+             target_branch: "master",
+             source_branch: 'markdown',
+             author: user2,
+             target_project_id: project.id
+
+        expect(response).to have_http_status(422)
+      end
+
       it "returns 400 when source_branch is missing" do
         post v3_api("/projects/#{fork_project.id}/merge_requests", user2),
         title: 'Test merge_request', target_branch: "master", author: user2, target_project_id: project.id
diff --git a/spec/services/merge_requests/build_service_spec.rb b/spec/services/merge_requests/build_service_spec.rb
index be9f9ea2dec..6f9d1208b1d 100644
--- a/spec/services/merge_requests/build_service_spec.rb
+++ b/spec/services/merge_requests/build_service_spec.rb
@@ -261,6 +261,16 @@ describe MergeRequests::BuildService, services: true do
       end
     end
 
+    context 'upstream project has disabled merge requests' do
+      let(:upstream_project) { create(:empty_project, :merge_requests_disabled) }
+      let(:project) { create(:empty_project, forked_from_project: upstream_project) }
+      let(:commits) { Commit.decorate([commit_1], project) }
+
+      it 'sets target project correctly' do
+        expect(merge_request.target_project).to eq(project)
+      end
+    end
+
     context 'target_project is set and accessible by current_user' do
       let(:target_project) { create(:project, :public, :repository)}
       let(:commits) { Commit.decorate([commit_1], project) }