Allow merge requests related to a commit to be found via API

- Original work for the web interface here:
 - https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/13713

1 files changed, 29 insertions, 0 deletions

diff --git a/spec/requests/api/commits_spec.rb b/spec/requests/api/commits_spec.rb
index 852f67db958..8ad19e3f0f5 100644
--- a/spec/requests/api/commits_spec.rb
+++ b/spec/requests/api/commits_spec.rb
@@ -1141,4 +1141,33 @@ describe API::Commits do
       end
     end
   end
+
+  describe 'GET /projects/:id/repository/commits/:sha/merge_requests' do
+    let!(:project) { create(:project, :repository, :private) }
+    let!(:merged_mr) { create(:merge_request, source_project: project, source_branch: 'master', target_branch: 'feature') }
+    let(:commit) { merged_mr.merge_request_diff.commits.last }
+
+    it 'returns the correct merge request' do
+      get api("/projects/#{project.id}/repository/commits/#{commit.id}/merge_requests", user)
+
+      expect(response).to have_gitlab_http_status(200)
+      expect(response).to include_pagination_headers
+      expect(json_response.length).to eq(1)
+      expect(json_response[0]['id']).to eq(merged_mr.id)
+    end
+
+    it 'returns 403 for an unauthorized user' do
+      project.add_guest(user)
+
+      get api("/projects/#{project.id}/repository/commits/#{commit.id}/merge_requests", user)
+
+      expect(response).to have_gitlab_http_status(403)
+    end
+
+    it 'responds 404 when the commit does not exist' do
+      get api("/projects/#{project.id}/repository/commits/a7d26f00c35b/merge_requests", user)
+
+      expect(response).to have_gitlab_http_status(404)
+    end
+  end
 end