Just use repository would fix the test

spec/features/task_lists_spec.rb

@@ -245,11 +245,8 @@ feature 'Task Lists' do
       visit project_merge_request_path(project, merge)
     end
 
-    before do
-      allow_any_instance_of(Repository).to receive(:write_ref)
-    end
-
     describe 'multiple tasks' do
+      let(:project) { create(:project, :repository) }
       let!(:merge) { create(:merge_request, :simple, description: markdown, author: user, source_project: project) }
 
       it 'renders for description' do