Add a system note and update relevant merge requests when a branch is deleted or re-added

If a branch is deleted with an open merge request, amended offline, and then pushed again,
GitLab doesn't bother to update the merge request even though the last commit ID and/or
code may have changed. This MR ensures that each push will update any relevant merge
requests and adds a system note if this happens as well.

Closes #2926

1 files changed, 8 insertions, 0 deletions

diff --git a/spec/services/git_push_service_spec.rb b/spec/services/git_push_service_spec.rb
index fd72905c331..17015d29e51 100644
--- a/spec/services/git_push_service_spec.rb
+++ b/spec/services/git_push_service_spec.rb
@@ -112,6 +112,14 @@ describe GitPushService do
     it { expect(@event.project).to eq(project) }
     it { expect(@event.action).to eq(Event::PUSHED) }
     it { expect(@event.data).to eq(service.push_data) }
+
+    context "Updates merge requests" do
+      it "when pushing a new branch for the first time" do
+        expect(project).to receive(:update_merge_requests).
+                               with(@blankrev, 'newrev', 'refs/heads/master', user)
+        service.execute(project, user, @blankrev, 'newrev', 'refs/heads/master')
+      end
+    end
   end
 
   describe "Web Hooks" do