func startHorizontalPodAutoscalerControllerWithRESTClient(ctx context.Context, controllerContext ControllerContext, controllerName string) (controller.Interface, bool, error) {

	clientConfig := controllerContext.ClientBuilder.ConfigOrDie("horizontal-pod-autoscaler")
	hpaClient := controllerContext.ClientBuilder.ClientOrDie("horizontal-pod-autoscaler")

	apiVersionsGetter := custom_metrics.NewAvailableAPIsGetter(hpaClient.Discovery())

type TestClientBuilder struct {
	clientset clientset.Interface
}

func (TestClientBuilder) Config(name string) (*restclient.Config, error) { return nil, nil }
func (TestClientBuilder) ConfigOrDie(name string) *restclient.Config {
	return &restclient.Config{}
}

func (TestClientBuilder) Client(name string) (clientset.Interface, error) { return nil, nil }

	client := controllerContext.ClientBuilder.ClientOrDie("disruption-controller")
	config := controllerContext.ClientBuilder.ConfigOrDie("disruption-controller")
	scaleKindResolver := scale.NewDiscoveryScaleKindResolver(client.Discovery())
	scaleClient, err := scale.NewForConfig(config, controllerContext.RESTMapper, dynamic.LegacyAPIPathResolverFunc, scaleKindResolver)

	if !controllerContext.ComponentConfig.GarbageCollectorController.EnableGarbageCollector {
		return nil, true, fmt.Errorf("storage version migrator requires garbage collector")
	}

	config := controllerContext.ClientBuilder.ConfigOrDie(controllerName)
	client := controllerContext.ClientBuilder.ClientOrDie(controllerName)
	informer := controllerContext.InformerFactory.Storagemigration().V1alpha1().StorageVersionMigrations()