for key, value := range labels {
		newLabels[key] = value
	}
	newLabels[labelKey] = labelValue
	return newLabels
}

// CloneAndRemoveLabel clones the given map and returns a new map with the given key removed.
// Returns the given map, if labelKey is empty.
func CloneAndRemoveLabel(labels map[string]string, labelKey string) map[string]string {
	if labelKey == "" {
		// Don't need to add a label.
		return labels
	}

		got := CloneAndAddLabel(tc.labels, tc.labelKey, tc.labelValue)
		if !reflect.DeepEqual(got, tc.want) {
			t.Errorf("[Add] got %v, want %v", got, tc.want)
		}
		// now test the inverse.
		got_rm := CloneAndRemoveLabel(got, tc.labelKey)
		if !reflect.DeepEqual(got_rm, tc.labels) {
			t.Errorf("[RM] got %v, want %v", got_rm, tc.labels)
		}
	}
}

func TestAddLabel(t *testing.T) {
	labels := map[string]string{

	// But first check if it has that label to avoid expensive copies.
	compareLabels := currentEndpoints.Labels
	if _, ok := currentEndpoints.Labels[v1.IsHeadlessService]; ok {
		compareLabels = utillabels.CloneAndRemoveLabel(currentEndpoints.Labels, v1.IsHeadlessService)
	}
	// When comparing the subsets, we ignore the difference in ResourceVersion of Pod to avoid unnecessary Endpoints

	deployment.Spec.Template.ObjectMeta = template.ObjectMeta
	deployment.Spec.Template.Spec = template.Spec
	deployment.Spec.Template.ObjectMeta.Labels = labelsutil.CloneAndRemoveLabel(
		deployment.Spec.Template.ObjectMeta.Labels,
		apps.DefaultDeploymentUniqueLabelKey)
	return deployment
}

// GetReplicaCountForReplicaSets returns the sum of Replicas of the given replica sets.