Omit max-count for diverging_commit_counts behind feature flag

We want to optimize the query for the CountDivergingCommits rpc by
removing the --max-count argument now that we have commit graphs
enabled for all repositories during housekeeping. However, we want to
test this first behind a feature flag.

1 files changed, 35 insertions, 2 deletions

diff --git a/spec/models/repository_spec.rb b/spec/models/repository_spec.rb
index 9ff0f355fd4..c5ab7e57272 100644
--- a/spec/models/repository_spec.rb
+++ b/spec/models/repository_spec.rb
@@ -2286,12 +2286,45 @@ describe Repository do
   end
 
   describe '#diverging_commit_counts' do
+    let(:diverged_branch) { repository.find_branch('fix') }
+    let(:root_ref_sha) { repository.raw_repository.commit(repository.root_ref).id }
+    let(:diverged_branch_sha) { diverged_branch.dereferenced_target.sha }
+
     it 'returns the commit counts behind and ahead of default branch' do
-      result = repository.diverging_commit_counts(
-        repository.find_branch('fix'))
+      result = repository.diverging_commit_counts(diverged_branch)
 
       expect(result).to eq(behind: 29, ahead: 2)
     end
+
+    context 'when gitaly_count_diverging_commits_no_max is enabled' do
+      before do
+        stub_feature_flags(gitaly_count_diverging_commits_no_max: true)
+      end
+
+      it 'calls diverging_commit_count without max count' do
+        expect(repository.raw_repository)
+          .to receive(:diverging_commit_count)
+          .with(root_ref_sha, diverged_branch_sha)
+          .and_return([29, 2])
+
+        repository.diverging_commit_counts(diverged_branch)
+      end
+    end
+
+    context 'when gitaly_count_diverging_commits_no_max is disabled' do
+      before do
+        stub_feature_flags(gitaly_count_diverging_commits_no_max: false)
+      end
+
+      it 'calls diverging_commit_count with max count' do
+        expect(repository.raw_repository)
+          .to receive(:diverging_commit_count)
+          .with(root_ref_sha, diverged_branch_sha, max_count: Repository::MAX_DIVERGING_COUNT)
+          .and_return([29, 2])
+
+        repository.diverging_commit_counts(diverged_branch)
+      end
+    end
   end
 
   describe '#refresh_method_caches' do