type MetricsClient interface {
	// GetResourceMetric gets the given resource metric (and an associated oldest timestamp)
	// for the specified named container in all pods matching the specified selector in the given namespace and when
	// the container is an empty string it returns the sum of all the container metrics.

type resourceMetricsClient struct {
	client resourceclient.PodMetricsesGetter
}

// GetResourceMetric gets the given resource metric (and an associated oldest timestamp)
// for all pods matching the specified selector in the given namespace

	metrics, timestamp, err := c.metricsClient.GetResourceMetric(ctx, resource, namespace, selector, container)
	if err != nil {
		return 0, 0, 0, time.Time{}, fmt.Errorf("unable to get metrics for resource %s: %v", resource, err)
	}

	isResource := len(tc.resourceName) > 0
	isExternal := tc.metricSelector != nil
	if isResource {
		info, timestamp, err := metricsClient.GetResourceMetric(context.TODO(), v1.ResourceName(tc.resourceName), tc.namespace, tc.selector, tc.container)
		tc.verifyResults(t, info, timestamp, err)
	} else if isExternal {