Add spec coverage for the flag being disabled

config/feature_flags/development/api_caching_rate_limit_repository_compare.yml

 ---
 name: api_caching_rate_limit_repository_compare
-introduced_by_url: 
-rollout_issue_url: 
-milestone: '14.0'
+introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/64407
+rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/334264
+milestone: '14.1'
 type: development
 group: group::source code
 default_enabled: false

spec/requests/api/repositories_spec.rb

@@ -477,6 +477,17 @@ RSpec.describe API::Repositories do
         let(:request) { get api(route, guest) }
       end
     end
+
+    context 'api_caching_rate_limit_repository_compare is disabled' do
+      before do
+        stub_feature_flags(api_caching_rate_limit_repository_compare: false)
+      end
+
+      it_behaves_like 'repository compare' do
+        let(:project) { create(:project, :public, :repository) }
+        let(:current_user) { nil }
+      end
+    end
   end
 
   describe 'GET /projects/:id/repository/contributors' do