/*
Copyright 2015 The Kubernetes Authors.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

package daemon

import (
	"fmt"
	"reflect"
	"sort"
	"strconv"
	"sync"
	"testing"

	"k8s.io/api/core/v1"
	extensions "k8s.io/api/extensions/v1beta1"
	"k8s.io/apimachinery/pkg/api/resource"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"k8s.io/apimachinery/pkg/runtime"
	"k8s.io/apimachinery/pkg/util/intstr"
	"k8s.io/apimachinery/pkg/util/uuid"
	"k8s.io/apiserver/pkg/storage/names"
	utilfeature "k8s.io/apiserver/pkg/util/feature"
	"k8s.io/client-go/informers"
	"k8s.io/client-go/kubernetes/fake"
	core "k8s.io/client-go/testing"
	"k8s.io/client-go/tools/cache"
	"k8s.io/client-go/tools/record"
	"k8s.io/client-go/util/workqueue"
	"k8s.io/kubernetes/pkg/api"
	"k8s.io/kubernetes/pkg/api/testapi"
	podutil "k8s.io/kubernetes/pkg/api/v1/pod"
	"k8s.io/kubernetes/pkg/controller"
	kubelettypes "k8s.io/kubernetes/pkg/kubelet/types"
	"k8s.io/kubernetes/pkg/securitycontext"
	labelsutil "k8s.io/kubernetes/pkg/util/labels"
	"k8s.io/kubernetes/plugin/pkg/scheduler/algorithm"
)

var (
	simpleDaemonSetLabel  = map[string]string{"name": "simple-daemon", "type": "production"}
	simpleDaemonSetLabel2 = map[string]string{"name": "simple-daemon", "type": "test"}
	simpleNodeLabel       = map[string]string{"color": "blue", "speed": "fast"}
	simpleNodeLabel2      = map[string]string{"color": "red", "speed": "fast"}
	alwaysReady           = func() bool { return true }
)

var (
	noScheduleTolerations = []v1.Toleration{{Key: "dedicated", Value: "user1", Effect: "NoSchedule"}}
	noScheduleTaints      = []v1.Taint{{Key: "dedicated", Value: "user1", Effect: "NoSchedule"}}
	noExecuteTaints       = []v1.Taint{{Key: "dedicated", Value: "user1", Effect: "NoExecute"}}
)

var (
	nodeNotReady = []v1.Taint{{
		Key:       algorithm.TaintNodeNotReady,
		Effect:    v1.TaintEffectNoExecute,
		TimeAdded: metav1.Now(),
	}}

	nodeUnreachable = []v1.Taint{{
		Key:       algorithm.TaintNodeUnreachable,
		Effect:    v1.TaintEffectNoExecute,
		TimeAdded: metav1.Now(),
	}}
)

func getKey(ds *extensions.DaemonSet, t *testing.T) string {
	if key, err := controller.KeyFunc(ds); err != nil {
		t.Errorf("Unexpected error getting key for ds %v: %v", ds.Name, err)
		return ""
	} else {
		return key
	}
}

func newDaemonSet(name string) *extensions.DaemonSet {
	two := int32(2)
	return &extensions.DaemonSet{
		TypeMeta: metav1.TypeMeta{APIVersion: testapi.Extensions.GroupVersion().String()},
		ObjectMeta: metav1.ObjectMeta{
			UID:       uuid.NewUUID(),
			Name:      name,
			Namespace: metav1.NamespaceDefault,
		},
		Spec: extensions.DaemonSetSpec{
			RevisionHistoryLimit: &two,
			UpdateStrategy: extensions.DaemonSetUpdateStrategy{
				Type: extensions.OnDeleteDaemonSetStrategyType,
			},
			Selector: &metav1.LabelSelector{MatchLabels: simpleDaemonSetLabel},
			Template: v1.PodTemplateSpec{
				ObjectMeta: metav1.ObjectMeta{
					Labels: simpleDaemonSetLabel,
				},
				Spec: v1.PodSpec{
					Containers: []v1.Container{
						{
							Image: "foo/bar",
							TerminationMessagePath: v1.TerminationMessagePathDefault,
							ImagePullPolicy:        v1.PullIfNotPresent,
							SecurityContext:        securitycontext.ValidSecurityContextWithContainerDefaults(),
						},
					},
					DNSPolicy: v1.DNSDefault,
				},
			},
		},
	}
}

func newRollbackStrategy() *extensions.DaemonSetUpdateStrategy {
	one := intstr.FromInt(1)
	return &extensions.DaemonSetUpdateStrategy{
		Type:          extensions.RollingUpdateDaemonSetStrategyType,
		RollingUpdate: &extensions.RollingUpdateDaemonSet{MaxUnavailable: &one},
	}
}

func newOnDeleteStrategy() *extensions.DaemonSetUpdateStrategy {
	return &extensions.DaemonSetUpdateStrategy{
		Type: extensions.OnDeleteDaemonSetStrategyType,
	}
}

func updateStrategies() []*extensions.DaemonSetUpdateStrategy {
	return []*extensions.DaemonSetUpdateStrategy{newOnDeleteStrategy(), newRollbackStrategy()}
}

func newNode(name string, label map[string]string) *v1.Node {
	return &v1.Node{
		TypeMeta: metav1.TypeMeta{APIVersion: api.Registry.GroupOrDie(v1.GroupName).GroupVersion.String()},
		ObjectMeta: metav1.ObjectMeta{
			Name:      name,
			Labels:    label,
			Namespace: metav1.NamespaceDefault,
		},
		Status: v1.NodeStatus{
			Conditions: []v1.NodeCondition{
				{Type: v1.NodeReady, Status: v1.ConditionTrue},
			},
			Allocatable: v1.ResourceList{
				v1.ResourcePods: resource.MustParse("100"),
			},
		},
	}
}

func addNodes(nodeStore cache.Store, startIndex, numNodes int, label map[string]string) {
	for i := startIndex; i < startIndex+numNodes; i++ {
		nodeStore.Add(newNode(fmt.Sprintf("node-%d", i), label))
	}
}

func newPod(podName string, nodeName string, label map[string]string, ds *extensions.DaemonSet) *v1.Pod {
	// Add hash unique label to the pod
	newLabels := label
	var podSpec v1.PodSpec
	// Copy pod spec from DaemonSet template, or use a default one if DaemonSet is nil
	if ds != nil {
		hash := fmt.Sprint(controller.ComputeHash(&ds.Spec.Template, ds.Status.CollisionCount))
		newLabels = labelsutil.CloneAndAddLabel(label, extensions.DefaultDaemonSetUniqueLabelKey, hash)
		podSpec = ds.Spec.Template.Spec
	} else {
		podSpec = v1.PodSpec{
			Containers: []v1.Container{
				{
					Image: "foo/bar",
					TerminationMessagePath: v1.TerminationMessagePathDefault,
					ImagePullPolicy:        v1.PullIfNotPresent,
					SecurityContext:        securitycontext.ValidSecurityContextWithContainerDefaults(),
				},
			},
		}
	}
	// Add node name to the pod
	if len(nodeName) > 0 {
		podSpec.NodeName = nodeName
	}

	pod := &v1.Pod{
		TypeMeta: metav1.TypeMeta{APIVersion: api.Registry.GroupOrDie(v1.GroupName).GroupVersion.String()},
		ObjectMeta: metav1.ObjectMeta{
			GenerateName: podName,
			Labels:       newLabels,
			Namespace:    metav1.NamespaceDefault,
		},
		Spec: podSpec,
	}
	pod.Name = names.SimpleNameGenerator.GenerateName(podName)
	if ds != nil {
		pod.OwnerReferences = []metav1.OwnerReference{*newControllerRef(ds)}
	}
	return pod
}

func addPods(podStore cache.Store, nodeName string, label map[string]string, ds *extensions.DaemonSet, number int) {
	for i := 0; i < number; i++ {
		pod := newPod(fmt.Sprintf("%s-", nodeName), nodeName, label, ds)
		podStore.Add(pod)
	}
}

func addFailedPods(podStore cache.Store, nodeName string, label map[string]string, ds *extensions.DaemonSet, number int) {
	for i := 0; i < number; i++ {
		pod := newPod(fmt.Sprintf("%s-", nodeName), nodeName, label, ds)
		pod.Status = v1.PodStatus{Phase: v1.PodFailed}
		podStore.Add(pod)
	}
}

type fakePodControl struct {
	sync.Mutex
	*controller.FakePodControl
	podStore cache.Store
	podIDMap map[string]*v1.Pod
}

func newFakePodControl() *fakePodControl {
	podIDMap := make(map[string]*v1.Pod)
	return &fakePodControl{
		FakePodControl: &controller.FakePodControl{},
		podIDMap:       podIDMap}
}

func (f *fakePodControl) CreatePodsOnNode(nodeName, namespace string, template *v1.PodTemplateSpec, object runtime.Object, controllerRef *metav1.OwnerReference) error {
	f.Lock()
	defer f.Unlock()
	if err := f.FakePodControl.CreatePodsOnNode(nodeName, namespace, template, object, controllerRef); err != nil {
		return fmt.Errorf("failed to create pod on node %q", nodeName)
	}

	pod := &v1.Pod{
		ObjectMeta: metav1.ObjectMeta{
			Labels:       template.Labels,
			Namespace:    namespace,
			GenerateName: fmt.Sprintf("%s-", nodeName),
		},
	}

	if err := api.Scheme.Convert(&template.Spec, &pod.Spec, nil); err != nil {
		return fmt.Errorf("unable to convert pod template: %v", err)
	}
	if len(nodeName) != 0 {
		pod.Spec.NodeName = nodeName
	}
	pod.Name = names.SimpleNameGenerator.GenerateName(fmt.Sprintf("%s-", nodeName))

	f.podStore.Update(pod)
	f.podIDMap[pod.Name] = pod
	return nil
}

func (f *fakePodControl) DeletePod(namespace string, podID string, object runtime.Object) error {
	f.Lock()
	defer f.Unlock()
	if err := f.FakePodControl.DeletePod(namespace, podID, object); err != nil {
		return fmt.Errorf("failed to delete pod %q", podID)
	}
	pod, ok := f.podIDMap[podID]
	if !ok {
		return fmt.Errorf("pod %q does not exist", podID)
	}
	f.podStore.Delete(pod)
	delete(f.podIDMap, podID)
	return nil
}

type daemonSetsController struct {
	*DaemonSetsController

	dsStore      cache.Store
	historyStore cache.Store
	podStore     cache.Store
	nodeStore    cache.Store
	fakeRecorder *record.FakeRecorder
}

func newTestController(initialObjects ...runtime.Object) (*daemonSetsController, *fakePodControl, *fake.Clientset) {
	clientset := fake.NewSimpleClientset(initialObjects...)
	informerFactory := informers.NewSharedInformerFactory(clientset, controller.NoResyncPeriodFunc())

	dsc := NewDaemonSetsController(
		informerFactory.Extensions().V1beta1().DaemonSets(),
		informerFactory.Apps().V1beta1().ControllerRevisions(),
		informerFactory.Core().V1().Pods(),
		informerFactory.Core().V1().Nodes(),
		clientset,
	)

	fakeRecorder := record.NewFakeRecorder(100)
	dsc.eventRecorder = fakeRecorder

	dsc.podStoreSynced = alwaysReady
	dsc.nodeStoreSynced = alwaysReady
	dsc.dsStoreSynced = alwaysReady
	dsc.historyStoreSynced = alwaysReady
	podControl := newFakePodControl()
	dsc.podControl = podControl
	podControl.podStore = informerFactory.Core().V1().Pods().Informer().GetStore()

	return &daemonSetsController{
		dsc,
		informerFactory.Extensions().V1beta1().DaemonSets().Informer().GetStore(),
		informerFactory.Apps().V1beta1().ControllerRevisions().Informer().GetStore(),
		informerFactory.Core().V1().Pods().Informer().GetStore(),
		informerFactory.Core().V1().Nodes().Informer().GetStore(),
		fakeRecorder,
	}, podControl, clientset
}

func validateSyncDaemonSets(t *testing.T, manager *daemonSetsController, fakePodControl *fakePodControl, expectedCreates, expectedDeletes int, expectedEvents int) {
	if len(fakePodControl.Templates) != expectedCreates {
		t.Errorf("Unexpected number of creates.  Expected %d, saw %d\n", expectedCreates, len(fakePodControl.Templates))
	}
	if len(fakePodControl.DeletePodName) != expectedDeletes {
		t.Errorf("Unexpected number of deletes.  Expected %d, saw %d\n", expectedDeletes, len(fakePodControl.DeletePodName))
	}
	if len(manager.fakeRecorder.Events) != expectedEvents {
		t.Errorf("Unexpected number of events.  Expected %d, saw %d\n", expectedEvents, len(manager.fakeRecorder.Events))
	}
	// Every Pod created should have a ControllerRef.
	if got, want := len(fakePodControl.ControllerRefs), expectedCreates; got != want {
		t.Errorf("len(ControllerRefs) = %v, want %v", got, want)
	}
	// Make sure the ControllerRefs are correct.
	for _, controllerRef := range fakePodControl.ControllerRefs {
		if got, want := controllerRef.APIVersion, "extensions/v1beta1"; got != want {
			t.Errorf("controllerRef.APIVersion = %q, want %q", got, want)
		}
		if got, want := controllerRef.Kind, "DaemonSet"; got != want {
			t.Errorf("controllerRef.Kind = %q, want %q", got, want)
		}
		if controllerRef.Controller == nil || *controllerRef.Controller != true {
			t.Errorf("controllerRef.Controller is not set to true")
		}
	}
}

func syncAndValidateDaemonSets(t *testing.T, manager *daemonSetsController, ds *extensions.DaemonSet, podControl *fakePodControl, expectedCreates, expectedDeletes int, expectedEvents int) {
	key, err := controller.KeyFunc(ds)
	if err != nil {
		t.Errorf("Could not get key for daemon.")
	}
	manager.syncHandler(key)
	validateSyncDaemonSets(t, manager, podControl, expectedCreates, expectedDeletes, expectedEvents)
}

// clearExpectations copies the FakePodControl to PodStore and clears the create and delete expectations.
func clearExpectations(t *testing.T, manager *daemonSetsController, ds *extensions.DaemonSet, fakePodControl *fakePodControl) {
	fakePodControl.Clear()

	key, err := controller.KeyFunc(ds)
	if err != nil {
		t.Errorf("Could not get key for daemon.")
		return
	}
	manager.expectations.DeleteExpectations(key)
}

func TestDeleteFinalStateUnknown(t *testing.T) {
	for _, strategy := range updateStrategies() {
		manager, _, _ := newTestController()
		addNodes(manager.nodeStore, 0, 1, nil)
		ds := newDaemonSet("foo")
		ds.Spec.UpdateStrategy = *strategy
		// DeletedFinalStateUnknown should queue the embedded DS if found.
		manager.deleteDaemonset(cache.DeletedFinalStateUnknown{Key: "foo", Obj: ds})
		enqueuedKey, _ := manager.queue.Get()
		if enqueuedKey.(string) != "default/foo" {
			t.Errorf("expected delete of DeletedFinalStateUnknown to enqueue the daemonset but found: %#v", enqueuedKey)
		}
	}
}

func markPodsReady(store cache.Store) {
	// mark pods as ready
	for _, obj := range store.List() {
		pod := obj.(*v1.Pod)
		markPodReady(pod)
	}
}

func markPodReady(pod *v1.Pod) {
	condition := v1.PodCondition{Type: v1.PodReady, Status: v1.ConditionTrue}
	podutil.UpdatePodCondition(&pod.Status, &condition)
}

// DaemonSets without node selectors should launch pods on every node.
func TestSimpleDaemonSetLaunchesPods(t *testing.T) {
	for _, strategy := range updateStrategies() {
		ds := newDaemonSet("foo")
		ds.Spec.UpdateStrategy = *strategy
		manager, podControl, _ := newTestController(ds)
		addNodes(manager.nodeStore, 0, 5, nil)
		manager.dsStore.Add(ds)
		syncAndValidateDaemonSets(t, manager, ds, podControl, 5, 0, 0)
	}
}

func TestSimpleDaemonSetUpdatesStatusAfterLaunchingPods(t *testing.T) {
	for _, strategy := range updateStrategies() {
		ds := newDaemonSet("foo")
		ds.Spec.UpdateStrategy = *strategy
		manager, podControl, clientset := newTestController(ds)

		var updated *extensions.DaemonSet
		clientset.PrependReactor("update", "daemonsets", func(action core.Action) (handled bool, ret runtime.Object, err error) {
			if action.GetSubresource() != "status" {
				return false, nil, nil
			}
			if u, ok := action.(core.UpdateAction); ok {
				updated = u.GetObject().(*extensions.DaemonSet)
			}
			return false, nil, nil
		})

		manager.dsStore.Add(ds)
		addNodes(manager.nodeStore, 0, 5, nil)
		syncAndValidateDaemonSets(t, manager, ds, podControl, 5, 0, 0)

		// Make sure the single sync() updated Status already for the change made
		// during the manage() phase.
		if got, want := updated.Status.CurrentNumberScheduled, int32(5); got != want {
			t.Errorf("Status.CurrentNumberScheduled = %v, want %v", got, want)
		}
	}
}

// DaemonSets should do nothing if there aren't any nodes
func TestNoNodesDoesNothing(t *testing.T) {
	for _, strategy := range updateStrategies() {
		manager, podControl, _ := newTestController()
		ds := newDaemonSet("foo")
		ds.Spec.UpdateStrategy = *strategy
		manager.dsStore.Add(ds)
		syncAndValidateDaemonSets(t, manager, ds, podControl, 0, 0, 0)
	}
}

// DaemonSets without node selectors should launch on a single node in a
// single node cluster.
func TestOneNodeDaemonLaunchesPod(t *testing.T) {
	for _, strategy := range updateStrategies() {
		ds := newDaemonSet("foo")
		ds.Spec.UpdateStrategy = *strategy
		manager, podControl, _ := newTestController(ds)
		manager.nodeStore.Add(newNode("only-node", nil))
		manager.dsStore.Add(ds)
		syncAndValidateDaemonSets(t, manager, ds, podControl, 1, 0, 0)
	}
}

// DaemonSets should place onto NotReady nodes
func TestNotReadNodeDaemonDoesNotLaunchPod(t *testing.T) {
	for _, strategy := range updateStrategies() {
		ds := newDaemonSet("foo")
		ds.Spec.UpdateStrategy = *strategy
		manager, podControl, _ := newTestController(ds)
		node := newNode("not-ready", nil)
		node.Status.Conditions = []v1.NodeCondition{
			{Type: v1.NodeReady, Status: v1.ConditionFalse},
		}
		manager.nodeStore.Add(node)
		manager.dsStore.Add(ds)
		syncAndValidateDaemonSets(t, manager, ds, podControl, 1, 0, 0)
	}
}

// DaemonSets should not place onto OutOfDisk nodes
func TestOutOfDiskNodeDaemonDoesNotLaunchPod(t *testing.T) {
	for _, strategy := range updateStrategies() {
		ds := newDaemonSet("foo")
		ds.Spec.UpdateStrategy = *strategy
		manager, podControl, _ := newTestController(ds)
		node := newNode("not-enough-disk", nil)
		node.Status.Conditions = []v1.NodeCondition{{Type: v1.NodeOutOfDisk, Status: v1.ConditionTrue}}
		manager.nodeStore.Add(node)
		manager.dsStore.Add(ds)
		syncAndValidateDaemonSets(t, manager, ds, podControl, 0, 0, 0)
	}
}

func resourcePodSpec(nodeName, memory, cpu string) v1.PodSpec {
	return v1.PodSpec{
		NodeName: nodeName,
		Containers: []v1.Container{{
			Resources: v1.ResourceRequirements{
				Requests: allocatableResources(memory, cpu),
			},
		}},
	}
}

func resourcePodSpecWithoutNodeName(memory, cpu string) v1.PodSpec {
	return v1.PodSpec{
		Containers: []v1.Container{{
			Resources: v1.ResourceRequirements{
				Requests: allocatableResources(memory, cpu),
			},
		}},
	}
}

func allocatableResources(memory, cpu string) v1.ResourceList {
	return v1.ResourceList{
		v1.ResourceMemory: resource.MustParse(memory),
		v1.ResourceCPU:    resource.MustParse(cpu),
		v1.ResourcePods:   resource.MustParse("100"),
	}
}

// DaemonSets should not place onto nodes with insufficient free resource
func TestInsufficientCapacityNodeDaemonDoesNotLaunchPod(t *testing.T) {
	for _, strategy := range updateStrategies() {
		podSpec := resourcePodSpec("too-much-mem", "75M", "75m")
		ds := newDaemonSet("foo")
		ds.Spec.UpdateStrategy = *strategy
		ds.Spec.Template.Spec = podSpec
		manager, podControl, _ := newTestController(ds)
		node := newNode("too-much-mem", nil)
		node.Status.Allocatable = allocatableResources("100M", "200m")
		manager.nodeStore.Add(node)
		manager.podStore.Add(&v1.Pod{
			Spec: podSpec,
		})
		manager.dsStore.Add(ds)
		switch strategy.Type {
		case extensions.OnDeleteDaemonSetStrategyType:
			syncAndValidateDaemonSets(t, manager, ds, podControl, 0, 0, 2)
		case extensions.RollingUpdateDaemonSetStrategyType:
			syncAndValidateDaemonSets(t, manager, ds, podControl, 0, 0, 3)
		default:
			t.Fatalf("unexpected UpdateStrategy %+v", strategy)
		}
	}
}

// DaemonSets should not unschedule a daemonset pod from a node with insufficient free resource
func TestInsufficientCapacityNodeDaemonDoesNotUnscheduleRunningPod(t *testing.T) {
	for _, strategy := range updateStrategies() {
		podSpec := resourcePodSpec("too-much-mem", "75M", "75m")
		podSpec.NodeName = "too-much-mem"
		ds := newDaemonSet("foo")
		ds.Spec.UpdateStrategy = *strategy
		ds.Spec.Template.Spec = podSpec
		manager, podControl, _ := newTestController(ds)
		node := newNode("too-much-mem", nil)
		node.Status.Allocatable = allocatableResources("100M", "200m")
		manager.nodeStore.Add(node)
		manager.podStore.Add(&v1.Pod{
			Spec: podSpec,
		})
		manager.dsStore.Add(ds)
		switch strategy.Type {
		case extensions.OnDeleteDaemonSetStrategyType:
			syncAndValidateDaemonSets(t, manager, ds, podControl, 0, 0, 2)
		case extensions.RollingUpdateDaemonSetStrategyType:
			syncAndValidateDaemonSets(t, manager, ds, podControl, 0, 0, 3)
		default:
			t.Fatalf("unexpected UpdateStrategy %+v", strategy)
		}
	}
}

// DaemonSets should only place onto nodes with sufficient free resource and matched node selector
func TestInsufficientCapacityNodeSufficientCapacityWithNodeLabelDaemonLaunchPod(t *testing.T) {
	podSpec := resourcePodSpecWithoutNodeName("50M", "75m")
	ds := newDaemonSet("foo")
	ds.Spec.Template.Spec = podSpec
	ds.Spec.Template.Spec.NodeSelector = simpleNodeLabel
	manager, podControl, _ := newTestController(ds)
	node1 := newNode("not-enough-resource", nil)
	node1.Status.Allocatable = allocatableResources("10M", "20m")
	node2 := newNode("enough-resource", simpleNodeLabel)
	node2.Status.Allocatable = allocatableResources("100M", "200m")
	manager.nodeStore.Add(node1)
	manager.nodeStore.Add(node2)
	manager.dsStore.Add(ds)
	syncAndValidateDaemonSets(t, manager, ds, podControl, 1, 0, 0)
	// we do not expect any event for insufficient free resource
	if len(manager.fakeRecorder.Events) != 0 {
		t.Fatalf("unexpected events, got %v, expected %v: %+v", len(manager.fakeRecorder.Events), 0, manager.fakeRecorder.Events)
	}
}

func TestSufficientCapacityWithTerminatedPodsDaemonLaunchesPod(t *testing.T) {
	for _, strategy := range updateStrategies() {
		podSpec := resourcePodSpec("too-much-mem", "75M", "75m")
		ds := newDaemonSet("foo")
		ds.Spec.UpdateStrategy = *strategy
		ds.Spec.Template.Spec = podSpec
		manager, podControl, _ := newTestController(ds)
		node := newNode("too-much-mem", nil)
		node.Status.Allocatable = allocatableResources("100M", "200m")
		manager.nodeStore.Add(node)
		manager.podStore.Add(&v1.Pod{
			Spec:   podSpec,
			Status: v1.PodStatus{Phase: v1.PodSucceeded},
		})
		manager.dsStore.Add(ds)
		syncAndValidateDaemonSets(t, manager, ds, podControl, 1, 0, 1)
	}
}

// DaemonSets should place onto nodes with sufficient free resource
func TestSufficientCapacityNodeDaemonLaunchesPod(t *testing.T) {
	for _, strategy := range updateStrategies() {
		podSpec := resourcePodSpec("not-too-much-mem", "75M", "75m")
		ds := newDaemonSet("foo")
		ds.Spec.UpdateStrategy = *strategy
		ds.Spec.Template.Spec = podSpec
		manager, podControl, _ := newTestController(ds)
		node := newNode("not-too-much-mem", nil)
		node.Status.Allocatable = allocatableResources("200M", "200m")
		manager.nodeStore.Add(node)
		manager.podStore.Add(&v1.Pod{
			Spec: podSpec,
		})
		manager.dsStore.Add(ds)
		syncAndValidateDaemonSets(t, manager, ds, podControl, 1, 0, 1)
	}
}

// DaemonSet should launch a pod on a node with taint NetworkUnavailable condition.
func TestNetworkUnavailableNodeDaemonLaunchesPod(t *testing.T) {
	for _, strategy := range updateStrategies() {
		ds := newDaemonSet("simple")
		ds.Spec.UpdateStrategy = *strategy
		manager, podControl, _ := newTestController(ds)

		node := newNode("network-unavailable", nil)
		node.Status.Conditions = []v1.NodeCondition{
			{Type: v1.NodeNetworkUnavailable, Status: v1.ConditionTrue},
		}
		manager.nodeStore.Add(node)
		manager.dsStore.Add(ds)

		syncAndValidateDaemonSets(t, manager, ds, podControl, 1, 0, 0)
	}
}

// DaemonSets not take any actions when being deleted
func TestDontDoAnythingIfBeingDeleted(t *testing.T) {
	for _, strategy := range updateStrategies() {
		podSpec := resourcePodSpec("not-too-much-mem", "75M", "75m")
		ds := newDaemonSet("foo")
		ds.Spec.UpdateStrategy = *strategy
		ds.Spec.Template.Spec = podSpec
		now := metav1.Now()
		ds.DeletionTimestamp = &now
		manager, podControl, _ := newTestController(ds)
		node := newNode("not-too-much-mem", nil)
		node.Status.Allocatable = allocatableResources("200M", "200m")
		manager.nodeStore.Add(node)
		manager.podStore.Add(&v1.Pod{
			Spec: podSpec,
		})
		manager.dsStore.Add(ds)
		syncAndValidateDaemonSets(t, manager, ds, podControl, 0, 0, 0)
	}
}

func TestDontDoAnythingIfBeingDeletedRace(t *testing.T) {
	for _, strategy := range updateStrategies() {
		// Bare client says it IS deleted.
		ds := newDaemonSet("foo")
		ds.Spec.UpdateStrategy = *strategy
		now := metav1.Now()
		ds.DeletionTimestamp = &now
		manager, podControl, _ := newTestController(ds)
		addNodes(manager.nodeStore, 0, 5, nil)

		// Lister (cache) says it's NOT deleted.
		ds2 := *ds
		ds2.DeletionTimestamp = nil
		manager.dsStore.Add(&ds2)

		// The existence of a matching orphan should block all actions in this state.
		pod := newPod("pod1-", "node-0", simpleDaemonSetLabel, nil)
		manager.podStore.Add(pod)

		syncAndValidateDaemonSets(t, manager, ds, podControl, 0, 0, 0)
	}
}

// DaemonSets should not place onto nodes that would cause port conflicts
func TestPortConflictNodeDaemonDoesNotLaunchPod(t *testing.T) {
	for _, strategy := range updateStrategies() {
		podSpec := v1.PodSpec{
			NodeName: "port-conflict",
			Containers: []v1.Container{{
				Ports: []v1.ContainerPort{{
					HostPort: 666,
				}},
			}},
		}
		manager, podControl, _ := newTestController()
		node := newNode("port-conflict", nil)
		manager.nodeStore.Add(node)
		manager.podStore.Add(&v1.Pod{
			Spec: podSpec,
		})

		ds := newDaemonSet("foo")
		ds.Spec.UpdateStrategy = *strategy
		ds.Spec.Template.Spec = podSpec
		manager.dsStore.Add(ds)
		syncAndValidateDaemonSets(t, manager, ds, podControl, 0, 0, 0)
	}
}

// Test that if the node is already scheduled with a pod using a host port
// but belonging to the same daemonset, we don't delete that pod
//
// Issue: https://github.com/kubernetes/kubernetes/issues/22309
func TestPortConflictWithSameDaemonPodDoesNotDeletePod(t *testing.T) {
	for _, strategy := range updateStrategies() {
		podSpec := v1.PodSpec{
			NodeName: "port-conflict",
			Containers: []v1.Container{{
				Ports: []v1.ContainerPort{{
					HostPort: 666,
				}},
			}},
		}
		manager, podControl, _ := newTestController()
		node := newNode("port-conflict", nil)
		manager.nodeStore.Add(node)
		ds := newDaemonSet("foo")
		ds.Spec.UpdateStrategy = *strategy
		ds.Spec.Template.Spec = podSpec
		manager.dsStore.Add(ds)
		pod := newPod(ds.Name+"-", node.Name, simpleDaemonSetLabel, ds)
		manager.podStore.Add(pod)
		syncAndValidateDaemonSets(t, manager, ds, podControl, 0, 0, 0)
	}
}

// DaemonSets should place onto nodes that would not cause port conflicts
func TestNoPortConflictNodeDaemonLaunchesPod(t *testing.T) {
	for _, strategy := range updateStrategies() {
		podSpec1 := v1.PodSpec{
			NodeName: "no-port-conflict",
			Containers: []v1.Container{{
				Ports: []v1.ContainerPort{{
					HostPort: 6661,
				}},
			}},
		}
		podSpec2 := v1.PodSpec{
			NodeName: "no-port-conflict",
			Containers: []v1.Container{{
				Ports: []v1.ContainerPort{{
					HostPort: 6662,
				}},
			}},
		}
		ds := newDaemonSet("foo")
		ds.Spec.UpdateStrategy = *strategy
		ds.Spec.Template.Spec = podSpec2
		manager, podControl, _ := newTestController(ds)
		node := newNode("no-port-conflict", nil)
		manager.nodeStore.Add(node)
		manager.podStore.Add(&v1.Pod{
			Spec: podSpec1,
		})
		manager.dsStore.Add(ds)
		syncAndValidateDaemonSets(t, manager, ds, podControl, 1, 0, 0)
	}
}

// DaemonSetController should not sync DaemonSets with empty pod selectors.
//
// issue https://github.com/kubernetes/kubernetes/pull/23223
func TestPodIsNotDeletedByDaemonsetWithEmptyLabelSelector(t *testing.T) {
	// Create a misconfigured DaemonSet. An empty pod selector is invalid but could happen
	// if we upgrade and make a backwards incompatible change.
	//
	// The node selector matches no nodes which mimics the behavior of kubectl delete.
	//
	// The DaemonSet should not schedule pods and should not delete scheduled pods in
	// this case even though it's empty pod selector matches all pods. The DaemonSetController
	// should detect this misconfiguration and choose not to sync the DaemonSet. We should
	// not observe a deletion of the pod on node1.
	for _, strategy := range updateStrategies() {
		ds := newDaemonSet("foo")
		ds.Spec.UpdateStrategy = *strategy
		ls := metav1.LabelSelector{}
		ds.Spec.Selector = &ls
		ds.Spec.Template.Spec.NodeSelector = map[string]string{"foo": "bar"}

		manager, podControl, _ := newTestController(ds)
		manager.nodeStore.Add(newNode("node1", nil))
		// Create pod not controlled by a daemonset.
		manager.podStore.Add(&v1.Pod{
			ObjectMeta: metav1.ObjectMeta{
				Labels:    map[string]string{"bang": "boom"},
				Namespace: metav1.NamespaceDefault,
			},
			Spec: v1.PodSpec{
				NodeName: "node1",
			},
		})
		manager.dsStore.Add(ds)

		syncAndValidateDaemonSets(t, manager, ds, podControl, 0, 0, 1)
	}
}

// Controller should not create pods on nodes which have daemon pods, and should remove excess pods from nodes that have extra pods.
func TestDealsWithExistingPods(t *testing.T) {
	for _, strategy := range updateStrategies() {
		ds := newDaemonSet("foo")
		ds.Spec.UpdateStrategy = *strategy
		manager, podControl, _ := newTestController(ds)
		manager.dsStore.Add(ds)
		addNodes(manager.nodeStore, 0, 5, nil)
		addPods(manager.podStore, "node-1", simpleDaemonSetLabel, ds, 1)
		addPods(manager.podStore, "node-2", simpleDaemonSetLabel, ds, 2)
		addPods(manager.podStore, "node-3", simpleDaemonSetLabel, ds, 5)
		addPods(manager.podStore, "node-4", simpleDaemonSetLabel2, ds, 2)
		syncAndValidateDaemonSets(t, manager, ds, podControl, 2, 5, 0)
	}
}

// Daemon with node selector should launch pods on nodes matching selector.
func TestSelectorDaemonLaunchesPods(t *testing.T) {
	for _, strategy := range updateStrategies() {
		daemon := newDaemonSet("foo")
		daemon.Spec.UpdateStrategy = *strategy
		daemon.Spec.Template.Spec.NodeSelector = simpleNodeLabel
		manager, podControl, _ := newTestController(daemon)
		addNodes(manager.nodeStore, 0, 4, nil)
		addNodes(manager.nodeStore, 4, 3, simpleNodeLabel)
		manager.dsStore.Add(daemon)
		syncAndValidateDaemonSets(t, manager, daemon, podControl, 3, 0, 0)
	}
}

// Daemon with node selector should delete pods from nodes that do not satisfy selector.
func TestSelectorDaemonDeletesUnselectedPods(t *testing.T) {
	for _, strategy := range updateStrategies() {
		ds := newDaemonSet("foo")
		ds.Spec.UpdateStrategy = *strategy
		ds.Spec.Template.Spec.NodeSelector = simpleNodeLabel
		manager, podControl, _ := newTestController(ds)
		manager.dsStore.Add(ds)
		addNodes(manager.nodeStore, 0, 5, nil)
		addNodes(manager.nodeStore, 5, 5, simpleNodeLabel)
		addPods(manager.podStore, "node-0", simpleDaemonSetLabel2, ds, 2)
		addPods(manager.podStore, "node-1", simpleDaemonSetLabel, ds, 3)
		addPods(manager.podStore, "node-1", simpleDaemonSetLabel2, ds, 1)
		addPods(manager.podStore, "node-4", simpleDaemonSetLabel, ds, 1)
		syncAndValidateDaemonSets(t, manager, ds, podControl, 5, 4, 0)
	}
}

// DaemonSet with node selector should launch pods on nodes matching selector, but also deal with existing pods on nodes.
func TestSelectorDaemonDealsWithExistingPods(t *testing.T) {
	for _, strategy := range updateStrategies() {
		ds := newDaemonSet("foo")
		ds.Spec.UpdateStrategy = *strategy
		ds.Spec.Template.Spec.NodeSelector = simpleNodeLabel
		manager, podControl, _ := newTestController(ds)
		manager.dsStore.Add(ds)
		addNodes(manager.nodeStore, 0, 5, nil)
		addNodes(manager.nodeStore, 5, 5, simpleNodeLabel)
		addPods(manager.podStore, "node-0", simpleDaemonSetLabel, ds, 1)
		addPods(manager.podStore, "node-1", simpleDaemonSetLabel, ds, 3)
		addPods(manager.podStore, "node-1", simpleDaemonSetLabel2, ds, 2)
		addPods(manager.podStore, "node-2", simpleDaemonSetLabel, ds, 4)
		addPods(manager.podStore, "node-6", simpleDaemonSetLabel, ds, 13)
		addPods(manager.podStore, "node-7", simpleDaemonSetLabel2, ds, 4)
		addPods(manager.podStore, "node-9", simpleDaemonSetLabel, ds, 1)
		addPods(manager.podStore, "node-9", simpleDaemonSetLabel2, ds, 1)
		syncAndValidateDaemonSets(t, manager, ds, podControl, 3, 20, 0)
	}
}

// DaemonSet with node selector which does not match any node labels should not launch pods.
func TestBadSelectorDaemonDoesNothing(t *testing.T) {
	for _, strategy := range updateStrategies() {
		manager, podControl, _ := newTestController()
		addNodes(manager.nodeStore, 0, 4, nil)
		addNodes(manager.nodeStore, 4, 3, simpleNodeLabel)
		ds := newDaemonSet("foo")
		ds.Spec.UpdateStrategy = *strategy
		ds.Spec.Template.Spec.NodeSelector = simpleNodeLabel2
		manager.dsStore.Add(ds)
		syncAndValidateDaemonSets(t, manager, ds, podControl, 0, 0, 0)
	}
}

// DaemonSet with node name should launch pod on node with corresponding name.
func TestNameDaemonSetLaunchesPods(t *testing.T) {
	for _, strategy := range updateStrategies() {
		ds := newDaemonSet("foo")
		ds.Spec.UpdateStrategy = *strategy
		ds.Spec.Template.Spec.NodeName = "node-0"
		manager, podControl, _ := newTestController(ds)
		addNodes(manager.nodeStore, 0, 5, nil)
		manager.dsStore.Add(ds)
		syncAndValidateDaemonSets(t, manager, ds, podControl, 1, 0, 0)
	}
}

// DaemonSet with node name that does not exist should not launch pods.
func TestBadNameDaemonSetDoesNothing(t *testing.T) {
	for _, strategy := range updateStrategies() {
		ds := newDaemonSet("foo")
		ds.Spec.UpdateStrategy = *strategy
		ds.Spec.Template.Spec.NodeName = "node-10"
		manager, podControl, _ := newTestController(ds)
		addNodes(manager.nodeStore, 0, 5, nil)
		manager.dsStore.Add(ds)
		syncAndValidateDaemonSets(t, manager, ds, podControl, 0, 0, 0)
	}
}

// DaemonSet with node selector, and node name, matching a node, should launch a pod on the node.
func TestNameAndSelectorDaemonSetLaunchesPods(t *testing.T) {
	for _, strategy := range updateStrategies() {
		ds := newDaemonSet("foo")
		ds.Spec.UpdateStrategy = *strategy
		ds.Spec.Template.Spec.NodeSelector = simpleNodeLabel
		ds.Spec.Template.Spec.NodeName = "node-6"
		manager, podControl, _ := newTestController(ds)
		addNodes(manager.nodeStore, 0, 4, nil)
		addNodes(manager.nodeStore, 4, 3, simpleNodeLabel)
		manager.dsStore.Add(ds)
		syncAndValidateDaemonSets(t, manager, ds, podControl, 1, 0, 0)
	}
}

// DaemonSet with node selector that matches some nodes, and node name that matches a different node, should do nothing.
func TestInconsistentNameSelectorDaemonSetDoesNothing(t *testing.T) {
	for _, strategy := range updateStrategies() {
		ds := newDaemonSet("foo")
		ds.Spec.UpdateStrategy = *strategy
		ds.Spec.Template.Spec.NodeSelector = simpleNodeLabel
		ds.Spec.Template.Spec.NodeName = "node-0"
		manager, podControl, _ := newTestController(ds)
		addNodes(manager.nodeStore, 0, 4, nil)
		addNodes(manager.nodeStore, 4, 3, simpleNodeLabel)
		manager.dsStore.Add(ds)
		syncAndValidateDaemonSets(t, manager, ds, podControl, 0, 0, 0)
	}
}

// DaemonSet with node selector, matching some nodes, should launch pods on all the nodes.
func TestSelectorDaemonSetLaunchesPods(t *testing.T) {
	ds := newDaemonSet("foo")
	ds.Spec.Template.Spec.NodeSelector = simpleNodeLabel
	manager, podControl, _ := newTestController(ds)
	addNodes(manager.nodeStore, 0, 4, nil)
	addNodes(manager.nodeStore, 4, 3, simpleNodeLabel)
	manager.dsStore.Add(ds)
	syncAndValidateDaemonSets(t, manager, ds, podControl, 3, 0, 0)
}

// Daemon with node affinity should launch pods on nodes matching affinity.
func TestNodeAffinityDaemonLaunchesPods(t *testing.T) {
	for _, strategy := range updateStrategies() {
		daemon := newDaemonSet("foo")
		daemon.Spec.UpdateStrategy = *strategy
		daemon.Spec.Template.Spec.Affinity = &v1.Affinity{
			NodeAffinity: &v1.NodeAffinity{
				RequiredDuringSchedulingIgnoredDuringExecution: &v1.NodeSelector{
					NodeSelectorTerms: []v1.NodeSelectorTerm{
						{
							MatchExpressions: []v1.NodeSelectorRequirement{
								{
									Key:      "color",
									Operator: v1.NodeSelectorOpIn,
									Values:   []string{simpleNodeLabel["color"]},
								},
							},
						},
					},
				},
			},
		}

		manager, podControl, _ := newTestController(daemon)
		addNodes(manager.nodeStore, 0, 4, nil)
		addNodes(manager.nodeStore, 4, 3, simpleNodeLabel)
		manager.dsStore.Add(daemon)
		syncAndValidateDaemonSets(t, manager, daemon, podControl, 3, 0, 0)
	}
}

func TestNumberReadyStatus(t *testing.T) {
	for _, strategy := range updateStrategies() {
		ds := newDaemonSet("foo")
		ds.Spec.UpdateStrategy = *strategy
		manager, podControl, clientset := newTestController(ds)
		var updated *extensions.DaemonSet
		clientset.PrependReactor("update", "daemonsets", func(action core.Action) (handled bool, ret runtime.Object, err error) {
			if action.GetSubresource() != "status" {
				return false, nil, nil
			}
			if u, ok := action.(core.UpdateAction); ok {
				updated = u.GetObject().(*extensions.DaemonSet)
			}
			return false, nil, nil
		})
		addNodes(manager.nodeStore, 0, 2, simpleNodeLabel)
		addPods(manager.podStore, "node-0", simpleDaemonSetLabel, ds, 1)
		addPods(manager.podStore, "node-1", simpleDaemonSetLabel, ds, 1)
		manager.dsStore.Add(ds)

		syncAndValidateDaemonSets(t, manager, ds, podControl, 0, 0, 0)
		if updated.Status.NumberReady != 0 {
			t.Errorf("Wrong daemon %s status: %v", updated.Name, updated.Status)
		}

		selector, _ := metav1.LabelSelectorAsSelector(ds.Spec.Selector)
		daemonPods, _ := manager.podLister.Pods(ds.Namespace).List(selector)
		for _, pod := range daemonPods {
			condition := v1.PodCondition{Type: v1.PodReady, Status: v1.ConditionTrue}
			pod.Status.Conditions = append(pod.Status.Conditions, condition)
		}

		syncAndValidateDaemonSets(t, manager, ds, podControl, 0, 0, 0)
		if updated.Status.NumberReady != 2 {
			t.Errorf("Wrong daemon %s status: %v", updated.Name, updated.Status)
		}
	}
}

func TestObservedGeneration(t *testing.T) {
	for _, strategy := range updateStrategies() {
		ds := newDaemonSet("foo")
		ds.Spec.UpdateStrategy = *strategy
		ds.Generation = 1
		manager, podControl, clientset := newTestController(ds)
		var updated *extensions.DaemonSet
		clientset.PrependReactor("update", "daemonsets", func(action core.Action) (handled bool, ret runtime.Object, err error) {
			if action.GetSubresource() != "status" {
				return false, nil, nil
			}
			if u, ok := action.(core.UpdateAction); ok {
				updated = u.GetObject().(*extensions.DaemonSet)
			}
			return false, nil, nil
		})

		addNodes(manager.nodeStore, 0, 1, simpleNodeLabel)
		addPods(manager.podStore, "node-0", simpleDaemonSetLabel, ds, 1)
		manager.dsStore.Add(ds)

		syncAndValidateDaemonSets(t, manager, ds, podControl, 0, 0, 0)
		if updated.Status.ObservedGeneration != ds.Generation {
			t.Errorf("Wrong ObservedGeneration for daemon %s in status. Expected %d, got %d", updated.Name, ds.Generation, updated.Status.ObservedGeneration)
		}
	}
}

// DaemonSet controller should kill all failed pods and create at most 1 pod on every node.
func TestDaemonKillFailedPods(t *testing.T) {
	tests := []struct {
		numFailedPods, numNormalPods, expectedCreates, expectedDeletes, expectedEvents int
		test                                                                           string
	}{
		{numFailedPods: 0, numNormalPods: 1, expectedCreates: 0, expectedDeletes: 0, expectedEvents: 0, test: "normal (do nothing)"},
		{numFailedPods: 0, numNormalPods: 0, expectedCreates: 1, expectedDeletes: 0, expectedEvents: 0, test: "no pods (create 1)"},
		{numFailedPods: 1, numNormalPods: 0, expectedCreates: 0, expectedDeletes: 1, expectedEvents: 1, test: "1 failed pod (kill 1), 0 normal pod (create 0; will create in the next sync)"},
		{numFailedPods: 1, numNormalPods: 3, expectedCreates: 0, expectedDeletes: 3, expectedEvents: 1, test: "1 failed pod (kill 1), 3 normal pods (kill 2)"},
		{numFailedPods: 2, numNormalPods: 1, expectedCreates: 0, expectedDeletes: 2, expectedEvents: 2, test: "2 failed pods (kill 2), 1 normal pod"},
	}

	for _, test := range tests {
		t.Logf("test case: %s\n", test.test)
		for _, strategy := range updateStrategies() {
			ds := newDaemonSet("foo")
			ds.Spec.UpdateStrategy = *strategy
			manager, podControl, _ := newTestController(ds)
			manager.dsStore.Add(ds)
			addNodes(manager.nodeStore, 0, 1, nil)
			addFailedPods(manager.podStore, "node-0", simpleDaemonSetLabel, ds, test.numFailedPods)
			addPods(manager.podStore, "node-0", simpleDaemonSetLabel, ds, test.numNormalPods)
			syncAndValidateDaemonSets(t, manager, ds, podControl, test.expectedCreates, test.expectedDeletes, test.expectedEvents)
		}
	}
}

// Daemonset should not remove a running pod from a node if the pod doesn't
// tolerate the nodes NoSchedule taint
func TestNoScheduleTaintedDoesntEvicitRunningIntolerantPod(t *testing.T) {
	for _, strategy := range updateStrategies() {
		ds := newDaemonSet("intolerant")
		ds.Spec.UpdateStrategy = *strategy
		manager, podControl, _ := newTestController(ds)

		node := newNode("tainted", nil)
		manager.nodeStore.Add(node)
		setNodeTaint(node, noScheduleTaints)
		manager.podStore.Add(newPod("keep-running-me", "tainted", simpleDaemonSetLabel, ds))
		manager.dsStore.Add(ds)

		syncAndValidateDaemonSets(t, manager, ds, podControl, 0, 0, 0)
	}
}

// Daemonset should remove a running pod from a node if the pod doesn't
// tolerate the nodes NoExecute taint
func TestNoExecuteTaintedDoesEvicitRunningIntolerantPod(t *testing.T) {
	for _, strategy := range updateStrategies() {
		ds := newDaemonSet("intolerant")
		ds.Spec.UpdateStrategy = *strategy
		manager, podControl, _ := newTestController(ds)

		node := newNode("tainted", nil)
		manager.nodeStore.Add(node)
		setNodeTaint(node, noExecuteTaints)
		manager.podStore.Add(newPod("stop-running-me", "tainted", simpleDaemonSetLabel, ds))
		manager.dsStore.Add(ds)

		syncAndValidateDaemonSets(t, manager, ds, podControl, 0, 1, 0)
	}
}

// DaemonSet should not launch a pod on a tainted node when the pod doesn't tolerate that taint.
func TestTaintedNodeDaemonDoesNotLaunchIntolerantPod(t *testing.T) {
	for _, strategy := range updateStrategies() {
		ds := newDaemonSet("intolerant")
		ds.Spec.UpdateStrategy = *strategy
		manager, podControl, _ := newTestController(ds)

		node := newNode("tainted", nil)
		setNodeTaint(node, noScheduleTaints)
		manager.nodeStore.Add(node)
		manager.dsStore.Add(ds)

		syncAndValidateDaemonSets(t, manager, ds, podControl, 0, 0, 0)
	}
}

// DaemonSet should launch a pod on a tainted node when the pod can tolerate that taint.
func TestTaintedNodeDaemonLaunchesToleratePod(t *testing.T) {
	for _, strategy := range updateStrategies() {
		ds := newDaemonSet("tolerate")
		ds.Spec.UpdateStrategy = *strategy
		setDaemonSetToleration(ds, noScheduleTolerations)
		manager, podControl, _ := newTestController(ds)

		node := newNode("tainted", nil)
		setNodeTaint(node, noScheduleTaints)
		manager.nodeStore.Add(node)
		manager.dsStore.Add(ds)

		syncAndValidateDaemonSets(t, manager, ds, podControl, 1, 0, 0)
	}
}

// DaemonSet should launch a pod on a not ready node with taint notReady:NoExecute.
func TestNotReadyNodeDaemonLaunchesPod(t *testing.T) {
	for _, strategy := range updateStrategies() {
		ds := newDaemonSet("simple")
		ds.Spec.UpdateStrategy = *strategy
		manager, podControl, _ := newTestController(ds)

		node := newNode("tainted", nil)
		setNodeTaint(node, nodeNotReady)
		node.Status.Conditions = []v1.NodeCondition{
			{Type: v1.NodeReady, Status: v1.ConditionFalse},
		}
		manager.nodeStore.Add(node)
		manager.dsStore.Add(ds)

		syncAndValidateDaemonSets(t, manager, ds, podControl, 1, 0, 0)
	}
}

// DaemonSet should launch a pod on an unreachable node with taint unreachable:NoExecute.
func TestUnreachableNodeDaemonLaunchesPod(t *testing.T) {
	for _, strategy := range updateStrategies() {
		ds := newDaemonSet("simple")
		ds.Spec.UpdateStrategy = *strategy
		manager, podControl, _ := newTestController(ds)

		node := newNode("tainted", nil)
		setNodeTaint(node, nodeUnreachable)
		node.Status.Conditions = []v1.NodeCondition{
			{Type: v1.NodeReady, Status: v1.ConditionUnknown},
		}
		manager.nodeStore.Add(node)
		manager.dsStore.Add(ds)

		syncAndValidateDaemonSets(t, manager, ds, podControl, 1, 0, 0)
	}
}

// DaemonSet should launch a pod on an untainted node when the pod has tolerations.
func TestNodeDaemonLaunchesToleratePod(t *testing.T) {
	for _, strategy := range updateStrategies() {
		ds := newDaemonSet("tolerate")
		ds.Spec.UpdateStrategy = *strategy
		setDaemonSetToleration(ds, noScheduleTolerations)
		manager, podControl, _ := newTestController(ds)

		node := newNode("untainted", nil)
		manager.nodeStore.Add(node)
		manager.dsStore.Add(ds)

		syncAndValidateDaemonSets(t, manager, ds, podControl, 1, 0, 0)
	}
}

func setNodeTaint(node *v1.Node, taints []v1.Taint) {
	node.Spec.Taints = taints
}

func setDaemonSetToleration(ds *extensions.DaemonSet, tolerations []v1.Toleration) {
	ds.Spec.Template.Spec.Tolerations = tolerations
}

// DaemonSet should launch a critical pod even when the node is OutOfDisk.
func TestOutOfDiskNodeDaemonLaunchesCriticalPod(t *testing.T) {
	for _, strategy := range updateStrategies() {
		ds := newDaemonSet("critical")
		ds.Spec.UpdateStrategy = *strategy
		setDaemonSetCritical(ds)
		manager, podControl, _ := newTestController(ds)

		node := newNode("not-enough-disk", nil)
		node.Status.Conditions = []v1.NodeCondition{{Type: v1.NodeOutOfDisk, Status: v1.ConditionTrue}}
		manager.nodeStore.Add(node)

		// Without enabling critical pod annotation feature gate, we shouldn't create critical pod
		utilfeature.DefaultFeatureGate.Set("ExperimentalCriticalPodAnnotation=False")
		manager.dsStore.Add(ds)
		syncAndValidateDaemonSets(t, manager, ds, podControl, 0, 0, 0)

		// Enabling critical pod annotation feature gate should create critical pod
		utilfeature.DefaultFeatureGate.Set("ExperimentalCriticalPodAnnotation=True")
		syncAndValidateDaemonSets(t, manager, ds, podControl, 1, 0, 0)
	}
}

// DaemonSet should launch a critical pod even when the node has insufficient free resource.
func TestInsufficientCapacityNodeDaemonLaunchesCriticalPod(t *testing.T) {
	for _, strategy := range updateStrategies() {
		podSpec := resourcePodSpec("too-much-mem", "75M", "75m")
		ds := newDaemonSet("critical")
		ds.Spec.UpdateStrategy = *strategy
		ds.Spec.Template.Spec = podSpec
		setDaemonSetCritical(ds)

		manager, podControl, _ := newTestController(ds)
		node := newNode("too-much-mem", nil)
		node.Status.Allocatable = allocatableResources("100M", "200m")
		manager.nodeStore.Add(node)
		manager.podStore.Add(&v1.Pod{
			Spec: podSpec,
		})

		// Without enabling critical pod annotation feature gate, we shouldn't create critical pod
		utilfeature.DefaultFeatureGate.Set("ExperimentalCriticalPodAnnotation=False")
		manager.dsStore.Add(ds)
		switch strategy.Type {
		case extensions.OnDeleteDaemonSetStrategyType:
			syncAndValidateDaemonSets(t, manager, ds, podControl, 0, 0, 2)
		case extensions.RollingUpdateDaemonSetStrategyType:
			syncAndValidateDaemonSets(t, manager, ds, podControl, 0, 0, 3)
		default:
			t.Fatalf("unexpected UpdateStrategy %+v", strategy)
		}

		// Enabling critical pod annotation feature gate should create critical pod
		utilfeature.DefaultFeatureGate.Set("ExperimentalCriticalPodAnnotation=True")
		switch strategy.Type {
		case extensions.OnDeleteDaemonSetStrategyType:
			syncAndValidateDaemonSets(t, manager, ds, podControl, 1, 0, 2)
		case extensions.RollingUpdateDaemonSetStrategyType:
			syncAndValidateDaemonSets(t, manager, ds, podControl, 1, 0, 3)
		default:
			t.Fatalf("unexpected UpdateStrategy %+v", strategy)
		}
	}
}

// DaemonSets should NOT launch a critical pod when there are port conflicts.
func TestPortConflictNodeDaemonDoesNotLaunchCriticalPod(t *testing.T) {
	for _, strategy := range updateStrategies() {
		podSpec := v1.PodSpec{
			NodeName: "port-conflict",
			Containers: []v1.Container{{
				Ports: []v1.ContainerPort{{
					HostPort: 666,
				}},
			}},
		}
		manager, podControl, _ := newTestController()
		node := newNode("port-conflict", nil)
		manager.nodeStore.Add(node)
		manager.podStore.Add(&v1.Pod{
			Spec: podSpec,
		})

		utilfeature.DefaultFeatureGate.Set("ExperimentalCriticalPodAnnotation=True")
		ds := newDaemonSet("critical")
		ds.Spec.UpdateStrategy = *strategy
		ds.Spec.Template.Spec = podSpec
		setDaemonSetCritical(ds)
		manager.dsStore.Add(ds)
		syncAndValidateDaemonSets(t, manager, ds, podControl, 0, 0, 0)
	}
}

func setDaemonSetCritical(ds *extensions.DaemonSet) {
	ds.Namespace = api.NamespaceSystem
	if ds.Spec.Template.ObjectMeta.Annotations == nil {
		ds.Spec.Template.ObjectMeta.Annotations = make(map[string]string)
	}
	ds.Spec.Template.ObjectMeta.Annotations[kubelettypes.CriticalPodAnnotationKey] = ""
}

func TestNodeShouldRunDaemonPod(t *testing.T) {
	cases := []struct {
		podsOnNode                                       []*v1.Pod
		ds                                               *extensions.DaemonSet
		wantToRun, shouldSchedule, shouldContinueRunning bool
		err                                              error
	}{
		{
			ds: &extensions.DaemonSet{
				Spec: extensions.DaemonSetSpec{
					Selector: &metav1.LabelSelector{MatchLabels: simpleDaemonSetLabel},
					Template: v1.PodTemplateSpec{
						ObjectMeta: metav1.ObjectMeta{
							Labels: simpleDaemonSetLabel,
						},
						Spec: resourcePodSpec("", "50M", "0.5"),
					},
				},
			},
			wantToRun:             true,
			shouldSchedule:        true,
			shouldContinueRunning: true,
		},
		{
			ds: &extensions.DaemonSet{
				Spec: extensions.DaemonSetSpec{
					Selector: &metav1.LabelSelector{MatchLabels: simpleDaemonSetLabel},
					Template: v1.PodTemplateSpec{
						ObjectMeta: metav1.ObjectMeta{
							Labels: simpleDaemonSetLabel,
						},
						Spec: resourcePodSpec("", "200M", "0.5"),
					},
				},
			},
			wantToRun:             true,
			shouldSchedule:        false,
			shouldContinueRunning: true,
		},
		{
			ds: &extensions.DaemonSet{
				Spec: extensions.DaemonSetSpec{
					Selector: &metav1.LabelSelector{MatchLabels: simpleDaemonSetLabel},
					Template: v1.PodTemplateSpec{
						ObjectMeta: metav1.ObjectMeta{
							Labels: simpleDaemonSetLabel,
						},
						Spec: resourcePodSpec("other-node", "50M", "0.5"),
					},
				},
			},
			wantToRun:             false,
			shouldSchedule:        false,
			shouldContinueRunning: false,
		},
		{
			podsOnNode: []*v1.Pod{
				{
					Spec: v1.PodSpec{
						Containers: []v1.Container{{
							Ports: []v1.ContainerPort{{
								HostPort: 666,
							}},
						}},
					},
				},
			},
			ds: &extensions.DaemonSet{
				Spec: extensions.DaemonSetSpec{
					Selector: &metav1.LabelSelector{MatchLabels: simpleDaemonSetLabel},
					Template: v1.PodTemplateSpec{
						ObjectMeta: metav1.ObjectMeta{
							Labels: simpleDaemonSetLabel,
						},
						Spec: v1.PodSpec{
							Containers: []v1.Container{{
								Ports: []v1.ContainerPort{{
									HostPort: 666,
								}},
							}},
						},
					},
				},
			},
			wantToRun:             false,
			shouldSchedule:        false,
			shouldContinueRunning: false,
		},
	}

	for i, c := range cases {
		for _, strategy := range updateStrategies() {
			node := newNode("test-node", nil)
			node.Status.Allocatable = allocatableResources("100M", "1")
			manager, _, _ := newTestController()
			manager.nodeStore.Add(node)
			for _, p := range c.podsOnNode {
				manager.podStore.Add(p)
				p.Spec.NodeName = "test-node"
			}
			c.ds.Spec.UpdateStrategy = *strategy
			wantToRun, shouldSchedule, shouldContinueRunning, err := manager.nodeShouldRunDaemonPod(node, c.ds)

			if wantToRun != c.wantToRun {
				t.Errorf("[%v] expected wantToRun: %v, got: %v", i, c.wantToRun, wantToRun)
			}
			if shouldSchedule != c.shouldSchedule {
				t.Errorf("[%v] expected shouldSchedule: %v, got: %v", i, c.shouldSchedule, shouldSchedule)
			}
			if shouldContinueRunning != c.shouldContinueRunning {
				t.Errorf("[%v] expected shouldContinueRunning: %v, got: %v", i, c.shouldContinueRunning, shouldContinueRunning)
			}
			if err != c.err {
				t.Errorf("[%v] expected err: %v, got: %v", i, c.err, err)
			}
		}
	}
}

// DaemonSets should be resynced when node labels or taints changed
func TestUpdateNode(t *testing.T) {
	var enqueued bool

	cases := []struct {
		test          string
		newNode       *v1.Node
		oldNode       *v1.Node
		ds            *extensions.DaemonSet
		shouldEnqueue bool
	}{
		{
			test:    "Nothing changed, should not enqueue",
			oldNode: newNode("node1", nil),
			newNode: newNode("node1", nil),
			ds: func() *extensions.DaemonSet {
				ds := newDaemonSet("ds")
				ds.Spec.Template.Spec.NodeSelector = simpleNodeLabel
				return ds
			}(),
			shouldEnqueue: false,
		},
		{
			test:    "Node labels changed",
			oldNode: newNode("node1", nil),
			newNode: newNode("node1", simpleNodeLabel),
			ds: func() *extensions.DaemonSet {
				ds := newDaemonSet("ds")
				ds.Spec.Template.Spec.NodeSelector = simpleNodeLabel
				return ds
			}(),
			shouldEnqueue: true,
		},
		{
			test: "Node taints changed",
			oldNode: func() *v1.Node {
				node := newNode("node1", nil)
				setNodeTaint(node, noScheduleTaints)
				return node
			}(),
			newNode:       newNode("node1", nil),
			ds:            newDaemonSet("ds"),
			shouldEnqueue: true,
		},
		{
			test: "Node conditions changed",
			oldNode: func() *v1.Node {
				node := newNode("node1", nil)
				node.Status.Conditions = []v1.NodeCondition{
					{Type: v1.NodeOutOfDisk, Status: v1.ConditionTrue},
				}
				return node
			}(),
			newNode:       newNode("node1", nil),
			ds:            newDaemonSet("ds"),
			shouldEnqueue: true,
		},
		{
			test: "Node conditions not changed",
			oldNode: func() *v1.Node {
				node := newNode("node1", nil)
				node.Status.Conditions = []v1.NodeCondition{
					{Type: v1.NodeOutOfDisk, Status: v1.ConditionTrue},
					{Type: v1.NodeMemoryPressure, Status: v1.ConditionFalse},
					{Type: v1.NodeDiskPressure, Status: v1.ConditionFalse},
					{Type: v1.NodeNetworkUnavailable, Status: v1.ConditionFalse},
					{Type: v1.NodeInodePressure, Status: v1.ConditionFalse},
				}
				return node
			}(),
			newNode: func() *v1.Node {
				node := newNode("node1", nil)
				node.Status.Conditions = []v1.NodeCondition{
					{Type: v1.NodeOutOfDisk, Status: v1.ConditionTrue},
					{Type: v1.NodeInodePressure, Status: v1.ConditionFalse},
				}
				return node
			}(),
			ds:            newDaemonSet("ds"),
			shouldEnqueue: false,
		},
	}
	for _, c := range cases {
		for _, strategy := range updateStrategies() {
			manager, podControl, _ := newTestController()
			manager.nodeStore.Add(c.oldNode)
			c.ds.Spec.UpdateStrategy = *strategy
			manager.dsStore.Add(c.ds)
			syncAndValidateDaemonSets(t, manager, c.ds, podControl, 0, 0, 0)

			manager.enqueueDaemonSet = func(ds *extensions.DaemonSet) {
				if ds.Name == "ds" {
					enqueued = true
				}
			}

			enqueued = false
			manager.updateNode(c.oldNode, c.newNode)
			if enqueued != c.shouldEnqueue {
				t.Errorf("Test case: '%s', expected: %t, got: %t", c.test, c.shouldEnqueue, enqueued)
			}
		}
	}
}

func TestGetNodesToDaemonPods(t *testing.T) {
	for _, strategy := range updateStrategies() {
		ds := newDaemonSet("foo")
		ds.Spec.UpdateStrategy = *strategy
		ds2 := newDaemonSet("foo2")
		ds2.Spec.UpdateStrategy = *strategy
		manager, _, _ := newTestController(ds, ds2)
		manager.dsStore.Add(ds)
		manager.dsStore.Add(ds2)
		addNodes(manager.nodeStore, 0, 2, nil)

		// These pods should be returned.
		wantedPods := []*v1.Pod{
			newPod("matching-owned-0-", "node-0", simpleDaemonSetLabel, ds),
			newPod("matching-orphan-0-", "node-0", simpleDaemonSetLabel, nil),
			newPod("matching-owned-1-", "node-1", simpleDaemonSetLabel, ds),
			newPod("matching-orphan-1-", "node-1", simpleDaemonSetLabel, nil),
		}
		failedPod := newPod("matching-owned-failed-pod-1-", "node-1", simpleDaemonSetLabel, ds)
		failedPod.Status = v1.PodStatus{Phase: v1.PodFailed}
		wantedPods = append(wantedPods, failedPod)
		for _, pod := range wantedPods {
			manager.podStore.Add(pod)
		}

		// These pods should be ignored.
		ignoredPods := []*v1.Pod{
			newPod("non-matching-owned-0-", "node-0", simpleDaemonSetLabel2, ds),
			newPod("non-matching-orphan-1-", "node-1", simpleDaemonSetLabel2, nil),
			newPod("matching-owned-by-other-0-", "node-0", simpleDaemonSetLabel, ds2),
			func() *v1.Pod {
				pod := newPod("matching-owned-2-but-set-for-deletion", "node-2", simpleDaemonSetLabel, ds)
				now := metav1.Now()
				pod.DeletionTimestamp = &now
				return pod
			}(),
		}
		for _, pod := range ignoredPods {
			manager.podStore.Add(pod)
		}

		nodesToDaemonPods, err := manager.getNodesToDaemonPods(ds)
		if err != nil {
			t.Fatalf("getNodesToDaemonPods() error: %v", err)
		}
		gotPods := map[string]bool{}
		for node, pods := range nodesToDaemonPods {
			for _, pod := range pods {
				if pod.Spec.NodeName != node {
					t.Errorf("pod %v grouped into %v but belongs in %v", pod.Name, node, pod.Spec.NodeName)
				}
				gotPods[pod.Name] = true
			}
		}
		for _, pod := range wantedPods {
			if !gotPods[pod.Name] {
				t.Errorf("expected pod %v but didn't get it", pod.Name)
			}
			delete(gotPods, pod.Name)
		}
		for podName := range gotPods {
			t.Errorf("unexpected pod %v was returned", podName)
		}
	}
}

func TestAddNode(t *testing.T) {
	manager, _, _ := newTestController()
	node1 := newNode("node1", nil)
	ds := newDaemonSet("ds")
	ds.Spec.Template.Spec.NodeSelector = simpleNodeLabel
	manager.dsStore.Add(ds)

	manager.addNode(node1)
	if got, want := manager.queue.Len(), 0; got != want {
		t.Fatalf("queue.Len() = %v, want %v", got, want)
	}

	node2 := newNode("node2", simpleNodeLabel)
	manager.addNode(node2)
	if got, want := manager.queue.Len(), 1; got != want {
		t.Fatalf("queue.Len() = %v, want %v", got, want)
	}
	key, done := manager.queue.Get()
	if key == nil || done {
		t.Fatalf("failed to enqueue controller for node %v", node2.Name)
	}
}

func TestAddPod(t *testing.T) {
	for _, strategy := range updateStrategies() {
		manager, _, _ := newTestController()
		ds1 := newDaemonSet("foo1")
		ds1.Spec.UpdateStrategy = *strategy
		ds2 := newDaemonSet("foo2")
		ds2.Spec.UpdateStrategy = *strategy
		manager.dsStore.Add(ds1)
		manager.dsStore.Add(ds2)

		pod1 := newPod("pod1-", "node-0", simpleDaemonSetLabel, ds1)
		manager.addPod(pod1)
		if got, want := manager.queue.Len(), 1; got != want {
			t.Fatalf("queue.Len() = %v, want %v", got, want)
		}
		key, done := manager.queue.Get()
		if key == nil || done {
			t.Fatalf("failed to enqueue controller for pod %v", pod1.Name)
		}
		expectedKey, _ := controller.KeyFunc(ds1)
		if got, want := key.(string), expectedKey; got != want {
			t.Errorf("queue.Get() = %v, want %v", got, want)
		}

		pod2 := newPod("pod2-", "node-0", simpleDaemonSetLabel, ds2)
		manager.addPod(pod2)
		if got, want := manager.queue.Len(), 1; got != want {
			t.Fatalf("queue.Len() = %v, want %v", got, want)
		}
		key, done = manager.queue.Get()
		if key == nil || done {
			t.Fatalf("failed to enqueue controller for pod %v", pod2.Name)
		}
		expectedKey, _ = controller.KeyFunc(ds2)
		if got, want := key.(string), expectedKey; got != want {
			t.Errorf("queue.Get() = %v, want %v", got, want)
		}
	}
}

func TestAddPodOrphan(t *testing.T) {
	for _, strategy := range updateStrategies() {
		manager, _, _ := newTestController()
		ds1 := newDaemonSet("foo1")
		ds1.Spec.UpdateStrategy = *strategy
		ds2 := newDaemonSet("foo2")
		ds2.Spec.UpdateStrategy = *strategy
		ds3 := newDaemonSet("foo3")
		ds3.Spec.UpdateStrategy = *strategy
		ds3.Spec.Selector.MatchLabels = simpleDaemonSetLabel2
		manager.dsStore.Add(ds1)
		manager.dsStore.Add(ds2)
		manager.dsStore.Add(ds3)

		// Make pod an orphan. Expect matching sets to be queued.
		pod := newPod("pod1-", "node-0", simpleDaemonSetLabel, nil)
		manager.addPod(pod)
		if got, want := manager.queue.Len(), 2; got != want {
			t.Fatalf("queue.Len() = %v, want %v", got, want)
		}
		if got, want := getQueuedKeys(manager.queue), []string{"default/foo1", "default/foo2"}; !reflect.DeepEqual(got, want) {
			t.Errorf("getQueuedKeys() = %v, want %v", got, want)
		}
	}
}

func TestUpdatePod(t *testing.T) {
	for _, strategy := range updateStrategies() {
		manager, _, _ := newTestController()
		ds1 := newDaemonSet("foo1")
		ds1.Spec.UpdateStrategy = *strategy
		ds2 := newDaemonSet("foo2")
		ds2.Spec.UpdateStrategy = *strategy
		manager.dsStore.Add(ds1)
		manager.dsStore.Add(ds2)

		pod1 := newPod("pod1-", "node-0", simpleDaemonSetLabel, ds1)
		prev := *pod1
		bumpResourceVersion(pod1)
		manager.updatePod(&prev, pod1)
		if got, want := manager.queue.Len(), 1; got != want {
			t.Fatalf("queue.Len() = %v, want %v", got, want)
		}
		key, done := manager.queue.Get()
		if key == nil || done {
			t.Fatalf("failed to enqueue controller for pod %v", pod1.Name)
		}
		expectedKey, _ := controller.KeyFunc(ds1)
		if got, want := key.(string), expectedKey; got != want {
			t.Errorf("queue.Get() = %v, want %v", got, want)
		}

		pod2 := newPod("pod2-", "node-0", simpleDaemonSetLabel, ds2)
		prev = *pod2
		bumpResourceVersion(pod2)
		manager.updatePod(&prev, pod2)
		if got, want := manager.queue.Len(), 1; got != want {
			t.Fatalf("queue.Len() = %v, want %v", got, want)
		}
		key, done = manager.queue.Get()
		if key == nil || done {
			t.Fatalf("failed to enqueue controller for pod %v", pod2.Name)
		}
		expectedKey, _ = controller.KeyFunc(ds2)
		if got, want := key.(string), expectedKey; got != want {
			t.Errorf("queue.Get() = %v, want %v", got, want)
		}
	}
}

func TestUpdatePodOrphanSameLabels(t *testing.T) {
	for _, strategy := range updateStrategies() {
		manager, _, _ := newTestController()
		ds1 := newDaemonSet("foo1")
		ds1.Spec.UpdateStrategy = *strategy
		ds2 := newDaemonSet("foo2")
		ds2.Spec.UpdateStrategy = *strategy
		manager.dsStore.Add(ds1)
		manager.dsStore.Add(ds2)

		pod := newPod("pod1-", "node-0", simpleDaemonSetLabel, nil)
		prev := *pod
		bumpResourceVersion(pod)
		manager.updatePod(&prev, pod)
		if got, want := manager.queue.Len(), 0; got != want {
			t.Fatalf("queue.Len() = %v, want %v", got, want)
		}
	}
}

func TestUpdatePodOrphanWithNewLabels(t *testing.T) {
	for _, strategy := range updateStrategies() {
		manager, _, _ := newTestController()
		ds1 := newDaemonSet("foo1")
		ds1.Spec.UpdateStrategy = *strategy
		ds2 := newDaemonSet("foo2")
		ds2.Spec.UpdateStrategy = *strategy
		manager.dsStore.Add(ds1)
		manager.dsStore.Add(ds2)

		pod := newPod("pod1-", "node-0", simpleDaemonSetLabel, nil)
		prev := *pod
		prev.Labels = map[string]string{"foo2": "bar2"}
		bumpResourceVersion(pod)
		manager.updatePod(&prev, pod)
		if got, want := manager.queue.Len(), 2; got != want {
			t.Fatalf("queue.Len() = %v, want %v", got, want)
		}
		if got, want := getQueuedKeys(manager.queue), []string{"default/foo1", "default/foo2"}; !reflect.DeepEqual(got, want) {
			t.Errorf("getQueuedKeys() = %v, want %v", got, want)
		}
	}
}

func TestUpdatePodChangeControllerRef(t *testing.T) {
	for _, strategy := range updateStrategies() {
		ds := newDaemonSet("foo")
		ds.Spec.UpdateStrategy = *strategy
		manager, _, _ := newTestController()
		ds1 := newDaemonSet("foo1")
		ds2 := newDaemonSet("foo2")
		manager.dsStore.Add(ds1)
		manager.dsStore.Add(ds2)

		pod := newPod("pod1-", "node-0", simpleDaemonSetLabel, ds1)
		prev := *pod
		prev.OwnerReferences = []metav1.OwnerReference{*newControllerRef(ds2)}
		bumpResourceVersion(pod)
		manager.updatePod(&prev, pod)
		if got, want := manager.queue.Len(), 2; got != want {
			t.Fatalf("queue.Len() = %v, want %v", got, want)
		}
	}
}

func TestUpdatePodControllerRefRemoved(t *testing.T) {
	for _, strategy := range updateStrategies() {
		manager, _, _ := newTestController()
		ds1 := newDaemonSet("foo1")
		ds1.Spec.UpdateStrategy = *strategy
		ds2 := newDaemonSet("foo2")
		ds2.Spec.UpdateStrategy = *strategy
		manager.dsStore.Add(ds1)
		manager.dsStore.Add(ds2)

		pod := newPod("pod1-", "node-0", simpleDaemonSetLabel, ds1)
		prev := *pod
		pod.OwnerReferences = nil
		bumpResourceVersion(pod)
		manager.updatePod(&prev, pod)
		if got, want := manager.queue.Len(), 2; got != want {
			t.Fatalf("queue.Len() = %v, want %v", got, want)
		}
	}
}

func TestDeletePod(t *testing.T) {
	for _, strategy := range updateStrategies() {
		manager, _, _ := newTestController()
		ds1 := newDaemonSet("foo1")
		ds1.Spec.UpdateStrategy = *strategy
		ds2 := newDaemonSet("foo2")
		ds2.Spec.UpdateStrategy = *strategy
		manager.dsStore.Add(ds1)
		manager.dsStore.Add(ds2)

		pod1 := newPod("pod1-", "node-0", simpleDaemonSetLabel, ds1)
		manager.deletePod(pod1)
		if got, want := manager.queue.Len(), 1; got != want {
			t.Fatalf("queue.Len() = %v, want %v", got, want)
		}
		key, done := manager.queue.Get()
		if key == nil || done {
			t.Fatalf("failed to enqueue controller for pod %v", pod1.Name)
		}
		expectedKey, _ := controller.KeyFunc(ds1)
		if got, want := key.(string), expectedKey; got != want {
			t.Errorf("queue.Get() = %v, want %v", got, want)
		}

		pod2 := newPod("pod2-", "node-0", simpleDaemonSetLabel, ds2)
		manager.deletePod(pod2)
		if got, want := manager.queue.Len(), 1; got != want {
			t.Fatalf("queue.Len() = %v, want %v", got, want)
		}
		key, done = manager.queue.Get()
		if key == nil || done {
			t.Fatalf("failed to enqueue controller for pod %v", pod2.Name)
		}
		expectedKey, _ = controller.KeyFunc(ds2)
		if got, want := key.(string), expectedKey; got != want {
			t.Errorf("queue.Get() = %v, want %v", got, want)
		}
	}
}

func TestDeletePodOrphan(t *testing.T) {
	for _, strategy := range updateStrategies() {
		manager, _, _ := newTestController()
		ds1 := newDaemonSet("foo1")
		ds1.Spec.UpdateStrategy = *strategy
		ds2 := newDaemonSet("foo2")
		ds2.Spec.UpdateStrategy = *strategy
		ds3 := newDaemonSet("foo3")
		ds3.Spec.UpdateStrategy = *strategy
		ds3.Spec.Selector.MatchLabels = simpleDaemonSetLabel2
		manager.dsStore.Add(ds1)
		manager.dsStore.Add(ds2)
		manager.dsStore.Add(ds3)

		pod := newPod("pod1-", "node-0", simpleDaemonSetLabel, nil)
		manager.deletePod(pod)
		if got, want := manager.queue.Len(), 0; got != want {
			t.Fatalf("queue.Len() = %v, want %v", got, want)
		}
	}
}

func bumpResourceVersion(obj metav1.Object) {
	ver, _ := strconv.ParseInt(obj.GetResourceVersion(), 10, 32)
	obj.SetResourceVersion(strconv.FormatInt(ver+1, 10))
}

// getQueuedKeys returns a sorted list of keys in the queue.
// It can be used to quickly check that multiple keys are in there.
func getQueuedKeys(queue workqueue.RateLimitingInterface) []string {
	var keys []string
	count := queue.Len()
	for i := 0; i < count; i++ {
		key, done := queue.Get()
		if done {
			return keys
		}
		keys = append(keys, key.(string))
	}
	sort.Strings(keys)
	return keys
}
