func createEvent(eventType eventType, selfUID string, owners []string) event {
	var ownerReferences []api.OwnerReference
	for i := 0; i < len(owners); i++ {
		ownerReferences = append(ownerReferences, api.OwnerReference{UID: types.UID(owners[i])})
	}
	return event{
		eventType: eventType,
		obj: &api.Pod{
			ObjectMeta: api.ObjectMeta{
				UID:             types.UID(selfUID),
				OwnerReferences: ownerReferences,
			},
		},
	}
}

func TestReasonCache(t *testing.T) {
	// Create test sync result
	syncResult := kubecontainer.PodSyncResult{}
	results := []*kubecontainer.SyncResult{
		// reason cache should be set for SyncResult with StartContainer action and error
		kubecontainer.NewSyncResult(kubecontainer.StartContainer, "container_1"),
		// reason cache should not be set for SyncResult with StartContainer action but without error
		kubecontainer.NewSyncResult(kubecontainer.StartContainer, "container_2"),
		// reason cache should not be set for SyncResult with other actions
		kubecontainer.NewSyncResult(kubecontainer.KillContainer, "container_3"),
	}
	results[0].Fail(kubecontainer.ErrRunContainer, "message_1")
	results[2].Fail(kubecontainer.ErrKillContainer, "message_3")
	syncResult.AddSyncResult(results...)
	uid := types.UID("pod_1")

	reasonCache := NewReasonCache()
	reasonCache.Update(uid, syncResult)
	assertReasonInfo(t, reasonCache, uid, results[0], true)
	assertReasonInfo(t, reasonCache, uid, results[1], false)
	assertReasonInfo(t, reasonCache, uid, results[2], false)

	reasonCache.Remove(uid, results[0].Target.(string))
	assertReasonInfo(t, reasonCache, uid, results[0], false)
}

func TestMounterAndUnmounterTypeAssert(t *testing.T) {
	tmpDir, err := utiltesting.MkTmpdir("awsebsTest")
	if err != nil {
		t.Fatalf("can't make a temp dir: %v", err)
	}
	defer os.RemoveAll(tmpDir)
	plugMgr := volume.VolumePluginMgr{}
	plugMgr.InitPlugins(ProbeVolumePlugins(), volumetest.NewFakeVolumeHost(tmpDir, nil, nil, "" /* rootContext */))

	plug, err := plugMgr.FindPluginByName("kubernetes.io/aws-ebs")
	if err != nil {
		t.Errorf("Can't find the plugin by name")
	}
	spec := &api.Volume{
		Name: "vol1",
		VolumeSource: api.VolumeSource{
			AWSElasticBlockStore: &api.AWSElasticBlockStoreVolumeSource{
				VolumeID: "pd",
				FSType:   "ext4",
			},
		},
	}

	mounter, err := plug.(*awsElasticBlockStorePlugin).newMounterInternal(volume.NewSpecFromVolume(spec), types.UID("poduid"), &fakePDManager{}, &mount.FakeMounter{})
	if _, ok := mounter.(volume.Unmounter); ok {
		t.Errorf("Volume Mounter can be type-assert to Unmounter")
	}

	unmounter, err := plug.(*awsElasticBlockStorePlugin).newUnmounterInternal("vol1", types.UID("poduid"), &fakePDManager{}, &mount.FakeMounter{})
	if _, ok := unmounter.(volume.Mounter); ok {
		t.Errorf("Volume Unmounter can be type-assert to Mounter")
	}
}

func getContainerInfoFromLabel(labels map[string]string) *labelledContainerInfo {
	var err error
	containerInfo := &labelledContainerInfo{
		PodName:      getStringValueFromLabel(labels, types.KubernetesPodNameLabel),
		PodNamespace: getStringValueFromLabel(labels, types.KubernetesPodNamespaceLabel),
		PodUID:       kubetypes.UID(getStringValueFromLabel(labels, types.KubernetesPodUIDLabel)),
		Name:         getStringValueFromLabel(labels, types.KubernetesContainerNameLabel),
		Hash:         getStringValueFromLabel(labels, kubernetesContainerHashLabel),
		TerminationMessagePath: getStringValueFromLabel(labels, kubernetesContainerTerminationMessagePathLabel),
	}
	if containerInfo.RestartCount, err = getIntValueFromLabel(labels, kubernetesContainerRestartCountLabel); err != nil {
		logError(containerInfo, kubernetesContainerRestartCountLabel, err)
	}
	if containerInfo.PodDeletionGracePeriod, err = getInt64PointerFromLabel(labels, kubernetesPodDeletionGracePeriodLabel); err != nil {
		logError(containerInfo, kubernetesPodDeletionGracePeriodLabel, err)
	}
	if containerInfo.PodTerminationGracePeriod, err = getInt64PointerFromLabel(labels, kubernetesPodTerminationGracePeriodLabel); err != nil {
		logError(containerInfo, kubernetesPodTerminationGracePeriodLabel, err)
	}
	preStopHandler := &api.Handler{}
	if found, err := getJsonObjectFromLabel(labels, kubernetesContainerPreStopHandlerLabel, preStopHandler); err != nil {
		logError(containerInfo, kubernetesContainerPreStopHandlerLabel, err)
	} else if found {
		containerInfo.PreStopHandler = preStopHandler
	}
	supplyContainerInfoWithOldLabel(labels, containerInfo)
	return containerInfo
}

//  This test the fast-fail path. We test that the precondition gets verified
//  again before deleting the object in tests of pkg/storage/etcd.
func (t *Tester) testDeleteWithUID(obj runtime.Object, createFn CreateFunc, getFn GetFunc, isNotFoundFn IsErrorFunc) {
	ctx := t.TestContext()

	foo := copyOrDie(obj)
	t.setObjectMeta(foo, t.namer(1))
	objectMeta := t.getObjectMetaOrFail(foo)
	objectMeta.UID = types.UID("UID0000")
	if err := createFn(ctx, foo); err != nil {
		t.Errorf("unexpected error: %v", err)
	}
	obj, err := t.storage.(rest.GracefulDeleter).Delete(ctx, objectMeta.Name, api.NewPreconditionDeleteOptions("UID1111"))
	if err == nil || !errors.IsConflict(err) {
		t.Errorf("unexpected error: %v", err)
	}

	obj, err = t.storage.(rest.GracefulDeleter).Delete(ctx, objectMeta.Name, api.NewPreconditionDeleteOptions("UID0000"))
	if err != nil {
		t.Errorf("unexpected error: %v", err)
	}

	if !t.returnDeletedObject {
		if status, ok := obj.(*unversioned.Status); !ok {
			t.Errorf("expected status of delete, got %v", status)
		} else if status.Status != unversioned.StatusSuccess {
			t.Errorf("expected success, got: %v", status.Status)
		}
	}

	_, err = getFn(ctx, foo)
	if err == nil || !isNotFoundFn(err) {
		t.Errorf("unexpected error: %v", err)
	}
}

func TestPluginBackCompat(t *testing.T) {
	basePath, err := utiltesting.MkTmpdir("emptydirTest")
	if err != nil {
		t.Fatalf("can't make a temp dir： %v", err)
	}
	defer os.RemoveAll(basePath)

	plug := makePluginUnderTest(t, "kubernetes.io/empty-dir", basePath, "" /* rootContext */)

	spec := &api.Volume{
		Name: "vol1",
	}
	pod := &api.Pod{ObjectMeta: api.ObjectMeta{UID: types.UID("poduid")}}
	mounter, err := plug.NewMounter(volume.NewSpecFromVolume(spec), pod, volume.VolumeOptions{})
	if err != nil {
		t.Errorf("Failed to make a new Mounter: %v", err)
	}
	if mounter == nil {
		t.Errorf("Got a nil Mounter")
	}

	volPath := mounter.GetPath()
	if volPath != path.Join(basePath, "pods/poduid/volumes/kubernetes.io~empty-dir/vol1") {
		t.Errorf("Got unexpected path: %s", volPath)
	}
}

// TestDependentsRace relies on golang's data race detector to check if there is
// data race among in the dependents field.
func TestDependentsRace(t *testing.T) {
	clientPool := dynamic.NewClientPool(&restclient.Config{}, dynamic.LegacyAPIPathResolverFunc)
	podResource := []unversioned.GroupVersionResource{{Version: "v1", Resource: "pods"}}
	gc, err := NewGarbageCollector(clientPool, podResource)
	if err != nil {
		t.Fatal(err)
	}

	const updates = 100
	owner := &node{dependentsLock: &sync.RWMutex{}, dependents: make(map[*node]struct{})}
	ownerUID := types.UID("owner")
	gc.propagator.uidToNode.Write(owner)
	go func() {
		for i := 0; i < updates; i++ {
			dependent := &node{}
			gc.propagator.addDependentToOwners(dependent, []metatypes.OwnerReference{{UID: ownerUID}})
			gc.propagator.removeDependentFromOwners(dependent, []metatypes.OwnerReference{{UID: ownerUID}})
		}
	}()
	go func() {
		gc.orphanQueue.Add(owner)
		for i := 0; i < updates; i++ {
			gc.orphanFinalizer()
		}
	}()
}

func (t *Tester) testUpdateWithWrongUID(obj runtime.Object, createFn CreateFunc, getFn GetFunc) {
	ctx := t.TestContext()
	foo := copyOrDie(obj)
	t.setObjectMeta(foo, t.namer(5))
	objectMeta := t.getObjectMetaOrFail(foo)
	objectMeta.UID = types.UID("UID0000")
	if err := createFn(ctx, foo); err != nil {
		t.Errorf("unexpected error: %v", err)
	}
	objectMeta.UID = types.UID("UID1111")

	obj, created, err := t.storage.(rest.Updater).Update(ctx, objectMeta.Name, rest.DefaultUpdatedObjectInfo(foo, api.Scheme))
	if created || obj != nil {
		t.Errorf("expected nil object and no creation for object: %v", foo)
	}
	if err == nil || !errors.IsConflict(err) {
		t.Errorf("unexpected error: %v", err)
	}
}

func (nc *NodeController) recordNodeEvent(nodeName, eventtype, reason, event string) {
	ref := &api.ObjectReference{
		Kind:      "Node",
		Name:      nodeName,
		UID:       types.UID(nodeName),
		Namespace: "",
	}
	glog.V(2).Infof("Recording %s event message for node %s", event, nodeName)
	nc.recorder.Eventf(ref, eventtype, reason, "Node %s event: %s", nodeName, event)
}

func TestPersistentClaimReadOnlyFlag(t *testing.T) {
	tmpDir, err := utiltesting.MkTmpdir("iscsi_test")
	if err != nil {
		t.Fatalf("error creating temp dir: %v", err)
	}
	defer os.RemoveAll(tmpDir)

	pv := &api.PersistentVolume{
		ObjectMeta: api.ObjectMeta{
			Name: "pvA",
		},
		Spec: api.PersistentVolumeSpec{
			PersistentVolumeSource: api.PersistentVolumeSource{
				ISCSI: &api.ISCSIVolumeSource{
					TargetPortal: "127.0.0.1:3260",
					IQN:          "iqn.2014-12.server:storage.target01",
					FSType:       "ext4",
					Lun:          0,
				},
			},
			ClaimRef: &api.ObjectReference{
				Name: "claimA",
			},
		},
	}

	claim := &api.PersistentVolumeClaim{
		ObjectMeta: api.ObjectMeta{
			Name:      "claimA",
			Namespace: "nsA",
		},
		Spec: api.PersistentVolumeClaimSpec{
			VolumeName: "pvA",
		},
		Status: api.PersistentVolumeClaimStatus{
			Phase: api.ClaimBound,
		},
	}

	client := fake.NewSimpleClientset(pv, claim)

	plugMgr := volume.VolumePluginMgr{}
	plugMgr.InitPlugins(ProbeVolumePlugins(), volumetest.NewFakeVolumeHost(tmpDir, client, nil, "" /* rootContext */))
	plug, _ := plugMgr.FindPluginByName(iscsiPluginName)

	// readOnly bool is supplied by persistent-claim volume source when its mounter creates other volumes
	spec := volume.NewSpecFromPersistentVolume(pv, true)
	pod := &api.Pod{ObjectMeta: api.ObjectMeta{UID: types.UID("poduid")}}
	mounter, _ := plug.NewMounter(spec, pod, volume.VolumeOptions{})

	if !mounter.GetAttributes().ReadOnly {
		t.Errorf("Expected true for mounter.IsReadOnly")
	}
}

func (nc *NodeController) recordNodeStatusChange(node *api.Node, new_status string) {
	ref := &api.ObjectReference{
		Kind:      "Node",
		Name:      node.Name,
		UID:       types.UID(node.Name),
		Namespace: "",
	}
	glog.V(2).Infof("Recording status change %s event message for node %s", new_status, node.Name)
	// TODO: This requires a transaction, either both node status is updated
	// and event is recorded or neither should happen, see issue #6055.
	nc.recorder.Eventf(ref, api.EventTypeNormal, new_status, "Node %s status is now: %s", node.Name, new_status)
}

func newPetSetWithVolumes(replicas int, name string, petMounts []api.VolumeMount, podMounts []api.VolumeMount) *apps.PetSet {
	mounts := append(petMounts, podMounts...)
	claims := []api.PersistentVolumeClaim{}
	for _, m := range petMounts {
		claims = append(claims, newPVC(m.Name))
	}

	vols := []api.Volume{}
	for _, m := range podMounts {
		vols = append(vols, api.Volume{
			Name: m.Name,
			VolumeSource: api.VolumeSource{
				HostPath: &api.HostPathVolumeSource{
					Path: fmt.Sprintf("/tmp/%v", m.Name),
				},
			},
		})
	}

	return &apps.PetSet{
		TypeMeta: unversioned.TypeMeta{
			Kind:       "PetSet",
			APIVersion: "apps/v1beta1",
		},
		ObjectMeta: api.ObjectMeta{
			Name:      name,
			Namespace: api.NamespaceDefault,
			UID:       types.UID("test"),
		},
		Spec: apps.PetSetSpec{
			Selector: &unversioned.LabelSelector{
				MatchLabels: map[string]string{"foo": "bar"},
			},
			Replicas: replicas,
			Template: api.PodTemplateSpec{
				Spec: api.PodSpec{
					Containers: []api.Container{
						{
							Name:         "nginx",
							Image:        "nginx",
							VolumeMounts: mounts,
						},
					},
					Volumes: vols,
				},
			},
			VolumeClaimTemplates: claims,
			ServiceName:          "governingsvc",
		},
	}
}

func TestGetWork(t *testing.T) {
	q, clock := newTestBasicWorkQueue()
	q.Enqueue(types.UID("foo1"), -1*time.Minute)
	q.Enqueue(types.UID("foo2"), -1*time.Minute)
	q.Enqueue(types.UID("foo3"), 1*time.Minute)
	q.Enqueue(types.UID("foo4"), 1*time.Minute)
	expected := []types.UID{types.UID("foo1"), types.UID("foo2")}
	compareResults(t, expected, q.GetWork())
	compareResults(t, []types.UID{}, q.GetWork())
	// Dial the time to 1 hour ahead.
	clock.Step(time.Hour)
	expected = []types.UID{types.UID("foo3"), types.UID("foo4")}
	compareResults(t, expected, q.GetWork())
	compareResults(t, []types.UID{}, q.GetWork())
}

func TestPatchWithVersionConflictThenAdmissionFailure(t *testing.T) {
	namespace := "bar"
	name := "foo"
	uid := types.UID("uid")
	fifteen := int64(15)
	thirty := int64(30)
	seen := false

	tc := &patchTestCase{
		name: "TestPatchWithVersionConflictThenAdmissionFailure",

		admit: func(updatedObject runtime.Object, currentObject runtime.Object) error {
			if seen {
				return errors.New("admission failure")
			}

			seen = true
			return nil
		},

		startingPod: &api.Pod{},
		changedPod:  &api.Pod{},
		updatePod:   &api.Pod{},

		expectedError: "admission failure",
	}

	tc.startingPod.Name = name
	tc.startingPod.Namespace = namespace
	tc.startingPod.UID = uid
	tc.startingPod.ResourceVersion = "1"
	tc.startingPod.APIVersion = "v1"
	tc.startingPod.Spec.ActiveDeadlineSeconds = &fifteen

	tc.changedPod.Name = name
	tc.changedPod.Namespace = namespace
	tc.changedPod.UID = uid
	tc.changedPod.ResourceVersion = "1"
	tc.changedPod.APIVersion = "v1"
	tc.changedPod.Spec.ActiveDeadlineSeconds = &thirty

	tc.updatePod.Name = name
	tc.updatePod.Namespace = namespace
	tc.updatePod.UID = uid
	tc.updatePod.ResourceVersion = "2"
	tc.updatePod.APIVersion = "v1"
	tc.updatePod.Spec.ActiveDeadlineSeconds = &fifteen
	tc.updatePod.Spec.NodeName = "anywhere"

	tc.Run(t)
}

func NewUUID() types.UID {
	uuidLock.Lock()
	defer uuidLock.Unlock()
	result := uuid.NewUUID()
	// The UUID package is naive and can generate identical UUIDs if the
	// time interval is quick enough.
	// The UUID uses 100 ns increments so it's short enough to actively
	// wait for a new value.
	for uuid.Equal(lastUUID, result) == true {
		result = uuid.NewUUID()
	}
	lastUUID = result
	return types.UID(result.String())
}

func TestJobStrategyWithGeneration(t *testing.T) {
	ctx := api.NewDefaultContext()

	theUID := types.UID("1a2b3c4d5e6f7g8h9i0k")

	validPodTemplateSpec := api.PodTemplateSpec{
		Spec: api.PodSpec{
			RestartPolicy: api.RestartPolicyOnFailure,
			DNSPolicy:     api.DNSClusterFirst,
			Containers:    []api.Container{{Name: "abc", Image: "image", ImagePullPolicy: "IfNotPresent"}},
		},
	}
	job := &batch.Job{
		ObjectMeta: api.ObjectMeta{
			Name:      "myjob2",
			Namespace: api.NamespaceDefault,
			UID:       theUID,
		},
		Spec: batch.JobSpec{
			Selector: nil,
			Template: validPodTemplateSpec,
		},
	}

	Strategy.PrepareForCreate(job)
	errs := Strategy.Validate(ctx, job)
	if len(errs) != 0 {
		t.Errorf("Unexpected error validating %v", errs)
	}

	// Validate the stuff that validation should have validated.
	if job.Spec.Selector == nil {
		t.Errorf("Selector not generated")
	}
	expectedLabels := make(map[string]string)
	expectedLabels["controller-uid"] = string(theUID)
	if !reflect.DeepEqual(job.Spec.Selector.MatchLabels, expectedLabels) {
		t.Errorf("Expected label selector not generated")
	}
	if job.Spec.Template.ObjectMeta.Labels == nil {
		t.Errorf("Expected template labels not generated")
	}
	if v, ok := job.Spec.Template.ObjectMeta.Labels["job-name"]; !ok || v != "myjob2" {
		t.Errorf("Expected template labels not present")
	}
	if v, ok := job.Spec.Template.ObjectMeta.Labels["controller-uid"]; !ok || v != string(theUID) {
		t.Errorf("Expected template labels not present: ok: %v, v: %v", ok, v)
	}
}

func TestPersistentClaimReadOnlyFlag(t *testing.T) {
	pv := &api.PersistentVolume{
		ObjectMeta: api.ObjectMeta{
			Name: "pvA",
		},
		Spec: api.PersistentVolumeSpec{
			PersistentVolumeSource: api.PersistentVolumeSource{
				GCEPersistentDisk: &api.GCEPersistentDiskVolumeSource{},
			},
			ClaimRef: &api.ObjectReference{
				Name: "claimA",
			},
		},
	}

	claim := &api.PersistentVolumeClaim{
		ObjectMeta: api.ObjectMeta{
			Name:      "claimA",
			Namespace: "nsA",
		},
		Spec: api.PersistentVolumeClaimSpec{
			VolumeName: "pvA",
		},
		Status: api.PersistentVolumeClaimStatus{
			Phase: api.ClaimBound,
		},
	}

	client := fake.NewSimpleClientset(pv, claim)

	tmpDir, err := utiltesting.MkTmpdir("gcepdTest")
	if err != nil {
		t.Fatalf("can't make a temp dir: %v", err)
	}
	defer os.RemoveAll(tmpDir)
	plugMgr := volume.VolumePluginMgr{}
	plugMgr.InitPlugins(ProbeVolumePlugins(), volumetest.NewFakeVolumeHost(tmpDir, client, nil, "" /* rootContext */))
	plug, _ := plugMgr.FindPluginByName(gcePersistentDiskPluginName)

	// readOnly bool is supplied by persistent-claim volume source when its mounter creates other volumes
	spec := volume.NewSpecFromPersistentVolume(pv, true)
	pod := &api.Pod{ObjectMeta: api.ObjectMeta{UID: types.UID("poduid")}}
	mounter, _ := plug.NewMounter(spec, pod, volume.VolumeOptions{})

	if !mounter.GetAttributes().ReadOnly {
		t.Errorf("Expected true for mounter.IsReadOnly")
	}
}

func TestPatchResourceWithVersionConflict(t *testing.T) {
	namespace := "bar"
	name := "foo"
	uid := types.UID("uid")
	fifteen := int64(15)
	thirty := int64(30)

	tc := &patchTestCase{
		name: "TestPatchResourceWithVersionConflict",

		startingPod: &api.Pod{},
		changedPod:  &api.Pod{},
		updatePod:   &api.Pod{},

		expectedPod: &api.Pod{},
	}

	tc.startingPod.Name = name
	tc.startingPod.Namespace = namespace
	tc.startingPod.UID = uid
	tc.startingPod.ResourceVersion = "1"
	tc.startingPod.APIVersion = "v1"
	tc.startingPod.Spec.ActiveDeadlineSeconds = &fifteen

	tc.changedPod.Name = name
	tc.changedPod.Namespace = namespace
	tc.changedPod.UID = uid
	tc.changedPod.ResourceVersion = "1"
	tc.changedPod.APIVersion = "v1"
	tc.changedPod.Spec.ActiveDeadlineSeconds = &thirty

	tc.updatePod.Name = name
	tc.updatePod.Namespace = namespace
	tc.updatePod.UID = uid
	tc.updatePod.ResourceVersion = "2"
	tc.updatePod.APIVersion = "v1"
	tc.updatePod.Spec.ActiveDeadlineSeconds = &fifteen
	tc.updatePod.Spec.NodeName = "anywhere"

	tc.expectedPod.Name = name
	tc.expectedPod.Namespace = namespace
	tc.expectedPod.UID = uid
	tc.expectedPod.ResourceVersion = "2"
	tc.expectedPod.Spec.ActiveDeadlineSeconds = &thirty
	tc.expectedPod.Spec.NodeName = "anywhere"

	tc.Run(t)
}

// buildSummaryPods aggregates and returns the container stats in cinfos by the Pod managing the container.
// Containers not managed by a Pod are omitted.
func (sb *summaryBuilder) buildSummaryPods() []stats.PodStats {
	// Map each container to a pod and update the PodStats with container data
	podToStats := map[stats.PodReference]*stats.PodStats{}
	for key, cinfo := range sb.infos {
		// on systemd using devicemapper each mount into the container has an associated cgroup.
		// we ignore them to ensure we do not get duplicate entries in our summary.
		// for details on .mount units: http://man7.org/linux/man-pages/man5/systemd.mount.5.html
		if strings.HasSuffix(key, ".mount") {
			continue
		}
		// Build the Pod key if this container is managed by a Pod
		if !sb.isPodManagedContainer(&cinfo) {
			continue
		}
		ref := sb.buildPodRef(&cinfo)

		// Lookup the PodStats for the pod using the PodRef.  If none exists, initialize a new entry.
		podStats, found := podToStats[ref]
		if !found {
			podStats = &stats.PodStats{PodRef: ref}
			podToStats[ref] = podStats
		}

		// Update the PodStats entry with the stats from the container by adding it to stats.Containers
		containerName := types.GetContainerName(cinfo.Spec.Labels)
		if containerName == leaky.PodInfraContainerName {
			// Special case for infrastructure container which is hidden from the user and has network stats
			podStats.Network = sb.containerInfoV2ToNetworkStats("pod:"+ref.Namespace+"_"+ref.Name, &cinfo)
			podStats.StartTime = unversioned.NewTime(cinfo.Spec.CreationTime)
		} else {
			podStats.Containers = append(podStats.Containers, sb.containerInfoV2ToStats(containerName, &cinfo))
		}
	}

	// Add each PodStats to the result
	result := make([]stats.PodStats, 0, len(podToStats))
	for _, podStats := range podToStats {
		// Lookup the volume stats for each pod
		podUID := kubetypes.UID(podStats.PodRef.UID)
		if vstats, found := sb.fsResourceAnalyzer.GetPodVolumeStats(podUID); found {
			podStats.VolumeStats = vstats.Volumes
		}
		result = append(result, *podStats)
	}
	return result
}

// TestMetrics tests that MetricProvider methods return sane values.
func TestMetrics(t *testing.T) {
	// Create an empty temp directory for the volume
	tmpDir, err := utiltesting.MkTmpdir("empty_dir_test")
	if err != nil {
		t.Fatalf("Can't make a tmp dir: %v", err)
	}
	defer os.RemoveAll(tmpDir)

	plug := makePluginUnderTest(t, "kubernetes.io/empty-dir", tmpDir, "" /* rootContext */)

	spec := &api.Volume{
		Name: "vol1",
	}
	pod := &api.Pod{ObjectMeta: api.ObjectMeta{UID: types.UID("poduid")}}
	mounter, err := plug.NewMounter(volume.NewSpecFromVolume(spec), pod, volume.VolumeOptions{})
	if err != nil {
		t.Errorf("Failed to make a new Mounter: %v", err)
	}

	// Need to create the subdirectory
	os.MkdirAll(mounter.GetPath(), 0755)

	expectedEmptyDirUsage, err := volumetest.FindEmptyDirectoryUsageOnTmpfs()
	if err != nil {
		t.Errorf("Unexpected error finding expected empty directory usage on tmpfs: %v", err)
	}

	// TODO(pwittroc): Move this into a reusable testing utility
	metrics, err := mounter.GetMetrics()
	if err != nil {
		t.Errorf("Unexpected error when calling GetMetrics %v", err)
	}
	if e, a := expectedEmptyDirUsage.Value(), metrics.Used.Value(); e != a {
		t.Errorf("Unexpected value for empty directory; expected %v, got %v", e, a)
	}
	if metrics.Capacity.Value() <= 0 {
		t.Errorf("Expected Capacity to be greater than 0")
	}
	if metrics.Available.Value() <= 0 {
		t.Errorf("Expected Available to be greater than 0")
	}
}