Clear merge requests counter cache after merge

Before this change, the MR counter in the sidebar would be wrong if an MR had
been merged since the last update, but not opened or closed, as merging did not
trigger a counter cache update.

1 files changed, 11 insertions, 0 deletions

diff --git a/spec/services/merge_requests/post_merge_service_spec.rb b/spec/services/merge_requests/post_merge_service_spec.rb
index a37cdab8928..d2bd05d921f 100644
--- a/spec/services/merge_requests/post_merge_service_spec.rb
+++ b/spec/services/merge_requests/post_merge_service_spec.rb
@@ -11,5 +11,16 @@ describe MergeRequests::PostMergeService do
 
   describe '#execute' do
     it_behaves_like 'cache counters invalidator'
+
+    it 'refreshes the number of open merge requests for a valid MR', :use_clean_rails_memory_store_caching do
+      # Cache the counter before the MR changed state.
+      project.open_merge_requests_count
+      merge_request.update!(state: 'merged')
+
+      service = described_class.new(project, user, {})
+
+      expect { service.execute(merge_request) }
+        .to change { project.open_merge_requests_count }.from(1).to(0)
+    end
   end
 end