Add missing spec to destroy_pipeline_service_spec

spec/services/ci/destroy_pipeline_service_spec.rb

@@ -17,6 +17,21 @@ describe ::Ci::DestroyPipelineService do
       expect { pipeline.reload }.to raise_error(ActiveRecord::RecordNotFound)
     end
 
+    it 'clears the cache', :use_clean_rails_memory_store_caching do
+      create(:commit_status, :success, pipeline: pipeline, ref: pipeline.ref)
+
+      expect(project.pipeline_status.has_status?).to be_truthy
+
+      subject
+
+      # Need to use find to avoid memoization
+      expect(Project.find(project.id).pipeline_status.has_status?).to be_falsey
+    end
+
+    it 'does not log an audit event' do
+      expect { subject }.not_to change { SecurityEvent.count }
+    end
+
     context 'when the pipeline has jobs' do
       let!(:build) { create(:ci_build, project: project, pipeline: pipeline) }