Fix tests and code for MWBS event move to pipeline

app/services/merge_requests/base_service.rb

@@ -56,12 +56,18 @@ module MergeRequests
 
     def pipeline_merge_requests(pipeline)
       merge_requests_for(pipeline.ref, pipeline.sha).each do |merge_request|
+        next unless pipeline == merge_request.pipeline
+
         yield merge_request
       end
     end
 
     def commit_status_merge_requests(commit_status)
       merge_requests_for(commit_status.ref, commit_status.sha).each do |merge_request|
+        pipeline = merge_request.pipeline
+        next unless pipeline
+        next unless pipeline.sha == commit_status.sha
+
         yield merge_request
       end
     end

spec/services/merge_requests/merge_when_build_succeeds_service_spec.rb

@@ -58,42 +58,44 @@ describe MergeRequests::MergeWhenBuildSucceedsService do
   end
 
   describe "#trigger" do
-    context 'build with ref' do
-      let(:build)     { create(:ci_build, ref: mr_merge_if_green_enabled.source_branch, status: "success") }
+    let(:merge_request_ref) { mr_merge_if_green_enabled.source_branch }
+    let(:merge_request_head) do
+      project.commit(mr_merge_if_green_enabled.source_branch).id
+    end
+
+    context 'when triggered by pipeline with valid ref and sha' do
+      let(:triggering_pipeline) do
+        create(:ci_pipeline, project: project, ref: merge_request_ref,
+                             sha: merge_request_head, status: 'success')
+      end
 
       it "merges all merge requests with merge when build succeeds enabled" do
-        allow_any_instance_of(MergeRequest).to receive(:pipeline).and_return(pipeline)
-        allow(pipeline).to receive(:success?).and_return(true)
-
         expect(MergeWorker).to receive(:perform_async)
-        service.trigger(build)
+        service.trigger(triggering_pipeline)
       end
     end
 
-    context 'triggered by an old build' do
-      let(:old_build) { create(:ci_build, ref: mr_merge_if_green_enabled.source_branch, status: "success") }
-      let(:build)     { create(:ci_build, ref: mr_merge_if_green_enabled.source_branch, status: "success") }
-
-      it "merges all merge requests with merge when build succeeds enabled" do
-        allow_any_instance_of(MergeRequest).to receive(:pipeline).and_return(pipeline)
-        allow(pipeline).to receive(:success?).and_return(true)
-        allow(old_build).to receive(:sha).and_return('1234abcdef')
+    context 'when triggered by an old pipeline' do
+      let(:old_pipeline) do
+        create(:ci_pipeline, project: project, ref: merge_request_ref,
+                             sha: '1234abcdef', status: 'success')
+      end
 
+      it 'it does not merge merge request' do
         expect(MergeWorker).not_to receive(:perform_async)
-        service.trigger(old_build)
+        service.trigger(old_pipeline)
       end
     end
 
-    context 'commit status without ref' do
-      let(:commit_status) { create(:generic_commit_status, status: 'success') }
-
-      before { mr_merge_if_green_enabled }
-
-      it "doesn't merge a requests for status on other branch" do
-        allow(project.repository).to receive(:branch_names_contains).with(commit_status.sha).and_return([])
+    context 'when triggered by pipeline from a different branch' do
+      let(:unrelated_pipeline) do
+        create(:ci_pipeline, project: project, ref: 'feature',
+                             sha: merge_request_head, status: 'success')
+      end
 
+      it 'does not merge request' do
         expect(MergeWorker).not_to receive(:perform_async)
-        service.trigger(commit_status)
+        service.trigger(unrelated_pipeline)
       end
 
       it 'discovers branches and merges all merge requests when status is success' do