Display related merge requests in commit detail page

3 files changed, 68 insertions, 0 deletions

diff --git a/spec/models/commit_spec.rb b/spec/models/commit_spec.rb
index 817254c7d1e..d3826417762 100644
--- a/spec/models/commit_spec.rb
+++ b/spec/models/commit_spec.rb
@@ -513,4 +513,17 @@ eos
       expect(described_class.valid_hash?('a' * 41)).to be false
     end
   end
+
+  describe '#merge_requests' do
+    let!(:project) { create(:project, :repository) }
+    let!(:merge_request1) { create(:merge_request, source_project: project, source_branch: 'master', target_branch: 'feature') }
+    let!(:merge_request2) { create(:merge_request, source_project: project, source_branch: 'merged-target', target_branch: 'feature') }
+    let(:commit1) { merge_request1.merge_request_diff.commits.last }
+    let(:commit2) { merge_request1.merge_request_diff.commits.first }
+
+    it 'returns merge_requests that introduced that commit' do
+      expect(commit1.merge_requests).to eq([merge_request1, merge_request2])
+      expect(commit2.merge_requests).to eq([merge_request1])
+    end
+  end
 end
diff --git a/spec/models/merge_request_diff_spec.rb b/spec/models/merge_request_diff_spec.rb
index d556004eccf..b4249d72fc8 100644
--- a/spec/models/merge_request_diff_spec.rb
+++ b/spec/models/merge_request_diff_spec.rb
@@ -15,6 +15,28 @@ describe MergeRequestDiff do
     it { expect(subject.start_commit_sha).to eq('0b4bc9a49b562e85de7cc9e834518ea6828729b9') }
   end
 
+  describe '.by_commit_sha' do
+    subject(:by_commit_sha) { described_class.by_commit_sha(sha) }
+
+    let!(:merge_request) { create(:merge_request, :with_diffs) }
+
+    context 'with sha contained in' do
+      let(:sha) { 'b83d6e391c22777fca1ed3012fce84f633d7fed0' }
+
+      it 'returns merge request diffs' do
+        expect(by_commit_sha).to eq([merge_request.merge_request_diff])
+      end
+    end
+
+    context 'with sha not contained in' do
+      let(:sha) { 'b83d6e3' }
+
+      it 'returns empty result' do
+        expect(by_commit_sha).to be_empty
+      end
+    end
+  end
+
   describe '#latest' do
     let!(:mr) { create(:merge_request, :with_diffs) }
     let!(:first_diff) { mr.merge_request_diff }
diff --git a/spec/models/merge_request_spec.rb b/spec/models/merge_request_spec.rb
index ceb06b3be18..c76f32b3989 100644
--- a/spec/models/merge_request_spec.rb
+++ b/spec/models/merge_request_spec.rb
@@ -87,6 +87,39 @@ describe MergeRequest do
     it { is_expected.to respond_to(:merge_when_pipeline_succeeds) }
   end
 
+  describe '.by_commit_sha' do
+    subject(:by_commit_sha) { described_class.by_commit_sha(sha) }
+
+    let!(:merge_request) { create(:merge_request, :with_diffs) }
+
+    context 'with sha contained in latest merge request diff' do
+      let(:sha) { 'b83d6e391c22777fca1ed3012fce84f633d7fed0' }
+
+      it 'returns merge requests' do
+        expect(by_commit_sha).to eq([merge_request])
+      end
+    end
+
+    context 'with sha contained not in latest merge request diff' do
+      let(:sha) { 'b83d6e391c22777fca1ed3012fce84f633d7fed0' }
+
+      it 'returns empty requests' do
+        latest_merge_request_diff = merge_request.merge_request_diffs.create
+        latest_merge_request_diff.merge_request_diff_commits.where(sha: 'b83d6e391c22777fca1ed3012fce84f633d7fed0').delete_all
+
+        expect(by_commit_sha).to be_empty
+      end
+    end
+
+    context 'with sha not contained in' do
+      let(:sha) { 'b83d6e3' }
+
+      it 'returns empty result' do
+        expect(by_commit_sha).to be_empty
+      end
+    end
+  end
+
   describe '.in_projects' do
     it 'returns the merge requests for a set of projects' do
       expect(described_class.in_projects(Project.all)).to eq([subject])