Beispiel #1
0
// hasCreateNamespaceAction returns true if it has the create namespace action
func hasCreateNamespaceAction(mockClient *fake.Clientset) bool {
	for _, action := range mockClient.Actions() {
		if action.GetVerb() == "create" && action.GetResource().Resource == "namespaces" {
			return true
		}
	}
	return false
}
Beispiel #2
0
func noAction(kubeClient *fake.Clientset, originClient *testclient.Fake) string {
	if len(kubeClient.Actions()) != 0 {
		return fmt.Sprintf("unexpected actions: %v", kubeClient.Actions())
	}
	if len(originClient.Actions()) != 0 {
		return fmt.Sprintf("unexpected actions: %v", originClient.Actions())
	}
	return ""
}
func TestDeploymentController_scaleDownOldReplicaSetsForRollingUpdate(t *testing.T) {
	tests := []struct {
		deploymentReplicas  int
		maxUnavailable      intstr.IntOrString
		readyPods           int
		oldReplicas         int
		scaleExpected       bool
		expectedOldReplicas int
	}{
		{
			deploymentReplicas: 10,
			maxUnavailable:     intstr.FromInt(0),
			readyPods:          10,
			oldReplicas:        10,
			scaleExpected:      false,
		},
		{
			deploymentReplicas:  10,
			maxUnavailable:      intstr.FromInt(2),
			readyPods:           10,
			oldReplicas:         10,
			scaleExpected:       true,
			expectedOldReplicas: 8,
		},
		{
			deploymentReplicas: 10,
			maxUnavailable:     intstr.FromInt(2),
			readyPods:          8,
			oldReplicas:        10,
			scaleExpected:      false,
		},
		{
			deploymentReplicas: 10,
			maxUnavailable:     intstr.FromInt(2),
			readyPods:          10,
			oldReplicas:        0,
			scaleExpected:      false,
		},
	}

	for i, test := range tests {
		t.Logf("executing scenario %d", i)
		oldRS := rs("foo-v2", test.oldReplicas, nil)
		allRSs := []*exp.ReplicaSet{oldRS}
		oldRSs := []*exp.ReplicaSet{oldRS}
		deployment := deployment("foo", test.deploymentReplicas, intstr.FromInt(0), test.maxUnavailable)
		fakeClientset := fake.Clientset{}
		fakeClientset.AddReactor("list", "pods", func(action core.Action) (handled bool, ret runtime.Object, err error) {
			switch action.(type) {
			case core.ListAction:
				podList := &api.PodList{}
				for podIndex := 0; podIndex < test.readyPods; podIndex++ {
					podList.Items = append(podList.Items, api.Pod{
						ObjectMeta: api.ObjectMeta{
							Name:   fmt.Sprintf("%s-pod-%d", oldRS.Name, podIndex),
							Labels: map[string]string{"foo": "bar"},
						},
						Status: api.PodStatus{
							Conditions: []api.PodCondition{
								{
									Type:   api.PodReady,
									Status: api.ConditionTrue,
								},
							},
						},
					})
				}
				return true, podList, nil
			}
			return false, nil, nil
		})
		controller := &DeploymentController{
			client:        &fakeClientset,
			eventRecorder: &record.FakeRecorder{},
		}
		scaled, err := controller.scaleDownOldReplicaSetsForRollingUpdate(allRSs, oldRSs, &deployment)
		if err != nil {
			t.Errorf("unexpected error: %v", err)
			continue
		}
		if !test.scaleExpected {
			if scaled != 0 {
				t.Errorf("unexpected scaling: %v", fakeClientset.Actions())
			}
			continue
		}
		if test.scaleExpected && scaled == 0 {
			t.Errorf("expected scaling to occur; actions: %v", fakeClientset.Actions())
			continue
		}
		// There are both list and update actions logged, so extract the update
		// action for verification.
		var updateAction testclient.UpdateAction
		for _, action := range fakeClientset.Actions() {
			switch a := action.(type) {
			case testclient.UpdateAction:
				if updateAction != nil {
					t.Errorf("expected only 1 update action; had %v and found %v", updateAction, a)
				} else {
					updateAction = a
				}
			}
		}
		if updateAction == nil {
			t.Errorf("expected an update action")
			continue
		}
		updated := updateAction.GetObject().(*exp.ReplicaSet)
		if e, a := test.expectedOldReplicas, updated.Spec.Replicas; e != a {
			t.Errorf("expected update to %d replicas, got %d", e, a)
		}
	}
}
func TestDeploymentController_reconcileOldReplicaSets(t *testing.T) {
	tests := []struct {
		deploymentReplicas  int
		maxUnavailable      intstr.IntOrString
		oldReplicas         int
		newReplicas         int
		readyPodsFromOldRS  int
		readyPodsFromNewRS  int
		scaleExpected       bool
		expectedOldReplicas int
	}{
		{
			deploymentReplicas: 10,
			maxUnavailable:     intstr.FromInt(0),
			oldReplicas:        10,
			newReplicas:        0,
			readyPodsFromOldRS: 10,
			readyPodsFromNewRS: 0,
			scaleExpected:      false,
		},
		{
			deploymentReplicas:  10,
			maxUnavailable:      intstr.FromInt(2),
			oldReplicas:         10,
			newReplicas:         0,
			readyPodsFromOldRS:  10,
			readyPodsFromNewRS:  0,
			scaleExpected:       true,
			expectedOldReplicas: 8,
		},
		{ // expect unhealthy replicas from old replica sets been cleaned up
			deploymentReplicas:  10,
			maxUnavailable:      intstr.FromInt(2),
			oldReplicas:         10,
			newReplicas:         0,
			readyPodsFromOldRS:  8,
			readyPodsFromNewRS:  0,
			scaleExpected:       true,
			expectedOldReplicas: 8,
		},
		{ // expect 1 unhealthy replica from old replica sets been cleaned up, and 1 ready pod been scaled down
			deploymentReplicas:  10,
			maxUnavailable:      intstr.FromInt(2),
			oldReplicas:         10,
			newReplicas:         0,
			readyPodsFromOldRS:  9,
			readyPodsFromNewRS:  0,
			scaleExpected:       true,
			expectedOldReplicas: 8,
		},
		{ // the unavailable pods from the newRS would not make us scale down old RSs in a further step
			deploymentReplicas: 10,
			maxUnavailable:     intstr.FromInt(2),
			oldReplicas:        8,
			newReplicas:        2,
			readyPodsFromOldRS: 8,
			readyPodsFromNewRS: 0,
			scaleExpected:      false,
		},
	}
	for i, test := range tests {
		t.Logf("executing scenario %d", i)

		newSelector := map[string]string{"foo": "new"}
		oldSelector := map[string]string{"foo": "old"}
		newRS := rs("foo-new", test.newReplicas, newSelector)
		oldRS := rs("foo-old", test.oldReplicas, oldSelector)
		oldRSs := []*exp.ReplicaSet{oldRS}
		allRSs := []*exp.ReplicaSet{oldRS, newRS}

		deployment := deployment("foo", test.deploymentReplicas, intstr.FromInt(0), test.maxUnavailable)
		fakeClientset := fake.Clientset{}
		fakeClientset.AddReactor("list", "pods", func(action core.Action) (handled bool, ret runtime.Object, err error) {
			switch action.(type) {
			case core.ListAction:
				podList := &api.PodList{}
				for podIndex := 0; podIndex < test.readyPodsFromOldRS; podIndex++ {
					podList.Items = append(podList.Items, api.Pod{
						ObjectMeta: api.ObjectMeta{
							Name:   fmt.Sprintf("%s-oldReadyPod-%d", oldRS.Name, podIndex),
							Labels: oldSelector,
						},
						Status: api.PodStatus{
							Conditions: []api.PodCondition{
								{
									Type:   api.PodReady,
									Status: api.ConditionTrue,
								},
							},
						},
					})
				}
				for podIndex := 0; podIndex < test.oldReplicas-test.readyPodsFromOldRS; podIndex++ {
					podList.Items = append(podList.Items, api.Pod{
						ObjectMeta: api.ObjectMeta{
							Name:   fmt.Sprintf("%s-oldUnhealthyPod-%d", oldRS.Name, podIndex),
							Labels: oldSelector,
						},
						Status: api.PodStatus{
							Conditions: []api.PodCondition{
								{
									Type:   api.PodReady,
									Status: api.ConditionFalse,
								},
							},
						},
					})
				}
				for podIndex := 0; podIndex < test.readyPodsFromNewRS; podIndex++ {
					podList.Items = append(podList.Items, api.Pod{
						ObjectMeta: api.ObjectMeta{
							Name:   fmt.Sprintf("%s-newReadyPod-%d", oldRS.Name, podIndex),
							Labels: newSelector,
						},
						Status: api.PodStatus{
							Conditions: []api.PodCondition{
								{
									Type:   api.PodReady,
									Status: api.ConditionTrue,
								},
							},
						},
					})
				}
				for podIndex := 0; podIndex < test.oldReplicas-test.readyPodsFromOldRS; podIndex++ {
					podList.Items = append(podList.Items, api.Pod{
						ObjectMeta: api.ObjectMeta{
							Name:   fmt.Sprintf("%s-newUnhealthyPod-%d", oldRS.Name, podIndex),
							Labels: newSelector,
						},
						Status: api.PodStatus{
							Conditions: []api.PodCondition{
								{
									Type:   api.PodReady,
									Status: api.ConditionFalse,
								},
							},
						},
					})
				}
				return true, podList, nil
			}
			return false, nil, nil
		})
		controller := &DeploymentController{
			client:        &fakeClientset,
			eventRecorder: &record.FakeRecorder{},
		}

		scaled, err := controller.reconcileOldReplicaSets(allRSs, oldRSs, newRS, &deployment)
		if err != nil {
			t.Errorf("unexpected error: %v", err)
			continue
		}
		if !test.scaleExpected && scaled {
			t.Errorf("unexpected scaling: %v", fakeClientset.Actions())
		}
		if test.scaleExpected && !scaled {
			t.Errorf("expected scaling to occur")
			continue
		}
		continue
	}
}
func TestDeploymentController_reconcileNewReplicaSet(t *testing.T) {
	tests := []struct {
		deploymentReplicas  int
		maxSurge            intstr.IntOrString
		oldReplicas         int
		newReplicas         int
		scaleExpected       bool
		expectedNewReplicas int
	}{
		{
			// Should not scale up.
			deploymentReplicas: 10,
			maxSurge:           intstr.FromInt(0),
			oldReplicas:        10,
			newReplicas:        0,
			scaleExpected:      false,
		},
		{
			deploymentReplicas:  10,
			maxSurge:            intstr.FromInt(2),
			oldReplicas:         10,
			newReplicas:         0,
			scaleExpected:       true,
			expectedNewReplicas: 2,
		},
		{
			deploymentReplicas:  10,
			maxSurge:            intstr.FromInt(2),
			oldReplicas:         5,
			newReplicas:         0,
			scaleExpected:       true,
			expectedNewReplicas: 7,
		},
		{
			deploymentReplicas: 10,
			maxSurge:           intstr.FromInt(2),
			oldReplicas:        10,
			newReplicas:        2,
			scaleExpected:      false,
		},
		{
			// Should scale down.
			deploymentReplicas:  10,
			maxSurge:            intstr.FromInt(2),
			oldReplicas:         2,
			newReplicas:         11,
			scaleExpected:       true,
			expectedNewReplicas: 10,
		},
	}

	for i, test := range tests {
		t.Logf("executing scenario %d", i)
		newRS := rs("foo-v2", test.newReplicas, nil)
		oldRS := rs("foo-v2", test.oldReplicas, nil)
		allRSs := []*exp.ReplicaSet{newRS, oldRS}
		deployment := deployment("foo", test.deploymentReplicas, test.maxSurge, intstr.FromInt(0))
		fake := fake.Clientset{}
		controller := &DeploymentController{
			client:        &fake,
			eventRecorder: &record.FakeRecorder{},
		}
		scaled, err := controller.reconcileNewReplicaSet(allRSs, newRS, &deployment)
		if err != nil {
			t.Errorf("unexpected error: %v", err)
			continue
		}
		if !test.scaleExpected {
			if scaled || len(fake.Actions()) > 0 {
				t.Errorf("unexpected scaling: %v", fake.Actions())
			}
			continue
		}
		if test.scaleExpected && !scaled {
			t.Errorf("expected scaling to occur")
			continue
		}
		if len(fake.Actions()) != 1 {
			t.Errorf("expected 1 action during scale, got: %v", fake.Actions())
			continue
		}
		updated := fake.Actions()[0].(testclient.UpdateAction).GetObject().(*exp.ReplicaSet)
		if e, a := test.expectedNewReplicas, updated.Spec.Replicas; e != a {
			t.Errorf("expected update to %d replicas, got %d", e, a)
		}
	}
}
func TestDeploymentController_scaleDownOldReplicaSetsForRollingUpdate(t *testing.T) {
	tests := []struct {
		deploymentReplicas  int
		maxUnavailable      intstr.IntOrString
		readyPods           int
		oldReplicas         int
		scaleExpected       bool
		expectedOldReplicas int
	}{
		{
			deploymentReplicas:  10,
			maxUnavailable:      intstr.FromInt(0),
			readyPods:           10,
			oldReplicas:         10,
			scaleExpected:       true,
			expectedOldReplicas: 9,
		},
		{
			deploymentReplicas:  10,
			maxUnavailable:      intstr.FromInt(2),
			readyPods:           10,
			oldReplicas:         10,
			scaleExpected:       true,
			expectedOldReplicas: 8,
		},
		{
			deploymentReplicas: 10,
			maxUnavailable:     intstr.FromInt(2),
			readyPods:          8,
			oldReplicas:        10,
			scaleExpected:      false,
		},
		{
			deploymentReplicas: 10,
			maxUnavailable:     intstr.FromInt(2),
			readyPods:          10,
			oldReplicas:        0,
			scaleExpected:      false,
		},
		{
			deploymentReplicas: 10,
			maxUnavailable:     intstr.FromInt(2),
			readyPods:          1,
			oldReplicas:        10,
			scaleExpected:      false,
		},
	}

	for i := range tests {
		test := tests[i]
		t.Logf("executing scenario %d", i)
		oldRS := rs("foo-v2", test.oldReplicas, nil, noTimestamp)
		oldRS.Status.AvailableReplicas = int32(test.readyPods)
		allRSs := []*extensions.ReplicaSet{oldRS}
		oldRSs := []*extensions.ReplicaSet{oldRS}
		maxSurge := intstr.FromInt(0)
		deployment := newDeployment("foo", test.deploymentReplicas, nil, &maxSurge, &test.maxUnavailable, map[string]string{"foo": "bar"})
		fakeClientset := fake.Clientset{}
		controller := &DeploymentController{
			client:        &fakeClientset,
			eventRecorder: &record.FakeRecorder{},
		}
		scaled, err := controller.scaleDownOldReplicaSetsForRollingUpdate(allRSs, oldRSs, deployment)
		if err != nil {
			t.Errorf("unexpected error: %v", err)
			continue
		}
		if !test.scaleExpected {
			if scaled != 0 {
				t.Errorf("unexpected scaling: %v", fakeClientset.Actions())
			}
			continue
		}
		if test.scaleExpected && scaled == 0 {
			t.Errorf("expected scaling to occur; actions: %v", fakeClientset.Actions())
			continue
		}
		// There are both list and update actions logged, so extract the update
		// action for verification.
		var updateAction core.UpdateAction
		for _, action := range fakeClientset.Actions() {
			switch a := action.(type) {
			case core.UpdateAction:
				if updateAction != nil {
					t.Errorf("expected only 1 update action; had %v and found %v", updateAction, a)
				} else {
					updateAction = a
				}
			}
		}
		if updateAction == nil {
			t.Errorf("expected an update action")
			continue
		}
		updated := updateAction.GetObject().(*extensions.ReplicaSet)
		if e, a := test.expectedOldReplicas, int(updated.Spec.Replicas); e != a {
			t.Errorf("expected update to %d replicas, got %d", e, a)
		}
	}
}
func TestDeploymentController_reconcileOldReplicaSets(t *testing.T) {
	tests := []struct {
		deploymentReplicas  int
		maxUnavailable      intstr.IntOrString
		oldReplicas         int
		newReplicas         int
		readyPodsFromOldRS  int
		readyPodsFromNewRS  int
		scaleExpected       bool
		expectedOldReplicas int
	}{
		{
			deploymentReplicas:  10,
			maxUnavailable:      intstr.FromInt(0),
			oldReplicas:         10,
			newReplicas:         0,
			readyPodsFromOldRS:  10,
			readyPodsFromNewRS:  0,
			scaleExpected:       true,
			expectedOldReplicas: 9,
		},
		{
			deploymentReplicas:  10,
			maxUnavailable:      intstr.FromInt(2),
			oldReplicas:         10,
			newReplicas:         0,
			readyPodsFromOldRS:  10,
			readyPodsFromNewRS:  0,
			scaleExpected:       true,
			expectedOldReplicas: 8,
		},
		{ // expect unhealthy replicas from old replica sets been cleaned up
			deploymentReplicas:  10,
			maxUnavailable:      intstr.FromInt(2),
			oldReplicas:         10,
			newReplicas:         0,
			readyPodsFromOldRS:  8,
			readyPodsFromNewRS:  0,
			scaleExpected:       true,
			expectedOldReplicas: 8,
		},
		{ // expect 1 unhealthy replica from old replica sets been cleaned up, and 1 ready pod been scaled down
			deploymentReplicas:  10,
			maxUnavailable:      intstr.FromInt(2),
			oldReplicas:         10,
			newReplicas:         0,
			readyPodsFromOldRS:  9,
			readyPodsFromNewRS:  0,
			scaleExpected:       true,
			expectedOldReplicas: 8,
		},
		{ // the unavailable pods from the newRS would not make us scale down old RSs in a further step
			deploymentReplicas: 10,
			maxUnavailable:     intstr.FromInt(2),
			oldReplicas:        8,
			newReplicas:        2,
			readyPodsFromOldRS: 8,
			readyPodsFromNewRS: 0,
			scaleExpected:      false,
		},
	}
	for i := range tests {
		test := tests[i]
		t.Logf("executing scenario %d", i)

		newSelector := map[string]string{"foo": "new"}
		oldSelector := map[string]string{"foo": "old"}
		newRS := rs("foo-new", test.newReplicas, newSelector, noTimestamp)
		newRS.Status.AvailableReplicas = int32(test.readyPodsFromNewRS)
		oldRS := rs("foo-old", test.oldReplicas, oldSelector, noTimestamp)
		oldRS.Status.AvailableReplicas = int32(test.readyPodsFromOldRS)
		oldRSs := []*extensions.ReplicaSet{oldRS}
		allRSs := []*extensions.ReplicaSet{oldRS, newRS}
		maxSurge := intstr.FromInt(0)
		deployment := newDeployment("foo", test.deploymentReplicas, nil, &maxSurge, &test.maxUnavailable, newSelector)
		fakeClientset := fake.Clientset{}
		controller := &DeploymentController{
			client:        &fakeClientset,
			eventRecorder: &record.FakeRecorder{},
		}

		scaled, err := controller.reconcileOldReplicaSets(allRSs, oldRSs, newRS, deployment)
		if err != nil {
			t.Errorf("unexpected error: %v", err)
			continue
		}
		if !test.scaleExpected && scaled {
			t.Errorf("unexpected scaling: %v", fakeClientset.Actions())
		}
		if test.scaleExpected && !scaled {
			t.Errorf("expected scaling to occur")
			continue
		}
		continue
	}
}
func TestScale(t *testing.T) {
	newTimestamp := unversioned.Date(2016, 5, 20, 2, 0, 0, 0, time.UTC)
	oldTimestamp := unversioned.Date(2016, 5, 20, 1, 0, 0, 0, time.UTC)
	olderTimestamp := unversioned.Date(2016, 5, 20, 0, 0, 0, 0, time.UTC)

	var updatedTemplate = func(replicas int) *extensions.Deployment {
		d := newDeployment("foo", replicas, nil, nil, nil, map[string]string{"foo": "bar"})
		d.Spec.Template.Labels["another"] = "label"
		return d
	}

	tests := []struct {
		name          string
		deployment    *extensions.Deployment
		oldDeployment *extensions.Deployment

		newRS  *extensions.ReplicaSet
		oldRSs []*extensions.ReplicaSet

		expectedNew  *extensions.ReplicaSet
		expectedOld  []*extensions.ReplicaSet
		wasntUpdated map[string]bool

		desiredReplicasAnnotations map[string]int32
	}{
		{
			name:          "normal scaling event: 10 -> 12",
			deployment:    newDeployment("foo", 12, nil, nil, nil, nil),
			oldDeployment: newDeployment("foo", 10, nil, nil, nil, nil),

			newRS:  rs("foo-v1", 10, nil, newTimestamp),
			oldRSs: []*extensions.ReplicaSet{},

			expectedNew: rs("foo-v1", 12, nil, newTimestamp),
			expectedOld: []*extensions.ReplicaSet{},
		},
		{
			name:          "normal scaling event: 10 -> 5",
			deployment:    newDeployment("foo", 5, nil, nil, nil, nil),
			oldDeployment: newDeployment("foo", 10, nil, nil, nil, nil),

			newRS:  rs("foo-v1", 10, nil, newTimestamp),
			oldRSs: []*extensions.ReplicaSet{},

			expectedNew: rs("foo-v1", 5, nil, newTimestamp),
			expectedOld: []*extensions.ReplicaSet{},
		},
		{
			name:          "proportional scaling: 5 -> 10",
			deployment:    newDeployment("foo", 10, nil, nil, nil, nil),
			oldDeployment: newDeployment("foo", 5, nil, nil, nil, nil),

			newRS:  rs("foo-v2", 2, nil, newTimestamp),
			oldRSs: []*extensions.ReplicaSet{rs("foo-v1", 3, nil, oldTimestamp)},

			expectedNew: rs("foo-v2", 4, nil, newTimestamp),
			expectedOld: []*extensions.ReplicaSet{rs("foo-v1", 6, nil, oldTimestamp)},
		},
		{
			name:          "proportional scaling: 5 -> 3",
			deployment:    newDeployment("foo", 3, nil, nil, nil, nil),
			oldDeployment: newDeployment("foo", 5, nil, nil, nil, nil),

			newRS:  rs("foo-v2", 2, nil, newTimestamp),
			oldRSs: []*extensions.ReplicaSet{rs("foo-v1", 3, nil, oldTimestamp)},

			expectedNew: rs("foo-v2", 1, nil, newTimestamp),
			expectedOld: []*extensions.ReplicaSet{rs("foo-v1", 2, nil, oldTimestamp)},
		},
		{
			name:          "proportional scaling: 9 -> 4",
			deployment:    newDeployment("foo", 4, nil, nil, nil, nil),
			oldDeployment: newDeployment("foo", 9, nil, nil, nil, nil),

			newRS:  rs("foo-v2", 8, nil, newTimestamp),
			oldRSs: []*extensions.ReplicaSet{rs("foo-v1", 1, nil, oldTimestamp)},

			expectedNew: rs("foo-v2", 4, nil, newTimestamp),
			expectedOld: []*extensions.ReplicaSet{rs("foo-v1", 0, nil, oldTimestamp)},
		},
		{
			name:          "proportional scaling: 7 -> 10",
			deployment:    newDeployment("foo", 10, nil, nil, nil, nil),
			oldDeployment: newDeployment("foo", 7, nil, nil, nil, nil),

			newRS:  rs("foo-v3", 2, nil, newTimestamp),
			oldRSs: []*extensions.ReplicaSet{rs("foo-v2", 3, nil, oldTimestamp), rs("foo-v1", 2, nil, olderTimestamp)},

			expectedNew: rs("foo-v3", 3, nil, newTimestamp),
			expectedOld: []*extensions.ReplicaSet{rs("foo-v2", 4, nil, oldTimestamp), rs("foo-v1", 3, nil, olderTimestamp)},
		},
		{
			name:          "proportional scaling: 13 -> 8",
			deployment:    newDeployment("foo", 8, nil, nil, nil, nil),
			oldDeployment: newDeployment("foo", 13, nil, nil, nil, nil),

			newRS:  rs("foo-v3", 2, nil, newTimestamp),
			oldRSs: []*extensions.ReplicaSet{rs("foo-v2", 8, nil, oldTimestamp), rs("foo-v1", 3, nil, olderTimestamp)},

			expectedNew: rs("foo-v3", 1, nil, newTimestamp),
			expectedOld: []*extensions.ReplicaSet{rs("foo-v2", 5, nil, oldTimestamp), rs("foo-v1", 2, nil, olderTimestamp)},
		},
		// Scales up the new replica set.
		{
			name:          "leftover distribution: 3 -> 4",
			deployment:    newDeployment("foo", 4, nil, nil, nil, nil),
			oldDeployment: newDeployment("foo", 3, nil, nil, nil, nil),

			newRS:  rs("foo-v3", 1, nil, newTimestamp),
			oldRSs: []*extensions.ReplicaSet{rs("foo-v2", 1, nil, oldTimestamp), rs("foo-v1", 1, nil, olderTimestamp)},

			expectedNew: rs("foo-v3", 2, nil, newTimestamp),
			expectedOld: []*extensions.ReplicaSet{rs("foo-v2", 1, nil, oldTimestamp), rs("foo-v1", 1, nil, olderTimestamp)},
		},
		// Scales down the older replica set.
		{
			name:          "leftover distribution: 3 -> 2",
			deployment:    newDeployment("foo", 2, nil, nil, nil, nil),
			oldDeployment: newDeployment("foo", 3, nil, nil, nil, nil),

			newRS:  rs("foo-v3", 1, nil, newTimestamp),
			oldRSs: []*extensions.ReplicaSet{rs("foo-v2", 1, nil, oldTimestamp), rs("foo-v1", 1, nil, olderTimestamp)},

			expectedNew: rs("foo-v3", 1, nil, newTimestamp),
			expectedOld: []*extensions.ReplicaSet{rs("foo-v2", 1, nil, oldTimestamp), rs("foo-v1", 0, nil, olderTimestamp)},
		},
		// Scales up the latest replica set first.
		{
			name:          "proportional scaling (no new rs): 4 -> 5",
			deployment:    newDeployment("foo", 5, nil, nil, nil, nil),
			oldDeployment: newDeployment("foo", 4, nil, nil, nil, nil),

			newRS:  nil,
			oldRSs: []*extensions.ReplicaSet{rs("foo-v2", 2, nil, oldTimestamp), rs("foo-v1", 2, nil, olderTimestamp)},

			expectedNew: nil,
			expectedOld: []*extensions.ReplicaSet{rs("foo-v2", 3, nil, oldTimestamp), rs("foo-v1", 2, nil, olderTimestamp)},
		},
		// Scales down to zero
		{
			name:          "proportional scaling: 6 -> 0",
			deployment:    newDeployment("foo", 0, nil, nil, nil, nil),
			oldDeployment: newDeployment("foo", 6, nil, nil, nil, nil),

			newRS:  rs("foo-v3", 3, nil, newTimestamp),
			oldRSs: []*extensions.ReplicaSet{rs("foo-v2", 2, nil, oldTimestamp), rs("foo-v1", 1, nil, olderTimestamp)},

			expectedNew: rs("foo-v3", 0, nil, newTimestamp),
			expectedOld: []*extensions.ReplicaSet{rs("foo-v2", 0, nil, oldTimestamp), rs("foo-v1", 0, nil, olderTimestamp)},
		},
		// Scales up from zero
		{
			name:          "proportional scaling: 0 -> 6",
			deployment:    newDeployment("foo", 6, nil, nil, nil, nil),
			oldDeployment: newDeployment("foo", 6, nil, nil, nil, nil),

			newRS:  rs("foo-v3", 0, nil, newTimestamp),
			oldRSs: []*extensions.ReplicaSet{rs("foo-v2", 0, nil, oldTimestamp), rs("foo-v1", 0, nil, olderTimestamp)},

			expectedNew:  rs("foo-v3", 6, nil, newTimestamp),
			expectedOld:  []*extensions.ReplicaSet{rs("foo-v2", 0, nil, oldTimestamp), rs("foo-v1", 0, nil, olderTimestamp)},
			wasntUpdated: map[string]bool{"foo-v2": true, "foo-v1": true},
		},
		// Scenario: deployment.spec.replicas == 3 ( foo-v1.spec.replicas == foo-v2.spec.replicas == foo-v3.spec.replicas == 1 )
		// Deployment is scaled to 5. foo-v3.spec.replicas and foo-v2.spec.replicas should increment by 1 but foo-v2 fails to
		// update.
		{
			name:          "failed rs update",
			deployment:    newDeployment("foo", 5, nil, nil, nil, nil),
			oldDeployment: newDeployment("foo", 5, nil, nil, nil, nil),

			newRS:  rs("foo-v3", 2, nil, newTimestamp),
			oldRSs: []*extensions.ReplicaSet{rs("foo-v2", 1, nil, oldTimestamp), rs("foo-v1", 1, nil, olderTimestamp)},

			expectedNew:  rs("foo-v3", 2, nil, newTimestamp),
			expectedOld:  []*extensions.ReplicaSet{rs("foo-v2", 2, nil, oldTimestamp), rs("foo-v1", 1, nil, olderTimestamp)},
			wasntUpdated: map[string]bool{"foo-v3": true, "foo-v1": true},

			desiredReplicasAnnotations: map[string]int32{"foo-v2": int32(3)},
		},
		{
			name:          "deployment with surge pods",
			deployment:    newDeployment("foo", 20, nil, maxSurge(2), nil, nil),
			oldDeployment: newDeployment("foo", 10, nil, maxSurge(2), nil, nil),

			newRS:  rs("foo-v2", 6, nil, newTimestamp),
			oldRSs: []*extensions.ReplicaSet{rs("foo-v1", 6, nil, oldTimestamp)},

			expectedNew: rs("foo-v2", 11, nil, newTimestamp),
			expectedOld: []*extensions.ReplicaSet{rs("foo-v1", 11, nil, oldTimestamp)},
		},
		{
			name:          "change both surge and size",
			deployment:    newDeployment("foo", 50, nil, maxSurge(6), nil, nil),
			oldDeployment: newDeployment("foo", 10, nil, maxSurge(3), nil, nil),

			newRS:  rs("foo-v2", 5, nil, newTimestamp),
			oldRSs: []*extensions.ReplicaSet{rs("foo-v1", 8, nil, oldTimestamp)},

			expectedNew: rs("foo-v2", 22, nil, newTimestamp),
			expectedOld: []*extensions.ReplicaSet{rs("foo-v1", 34, nil, oldTimestamp)},
		},
		{
			name:          "change both size and template",
			deployment:    updatedTemplate(14),
			oldDeployment: newDeployment("foo", 10, nil, nil, nil, map[string]string{"foo": "bar"}),

			newRS:  nil,
			oldRSs: []*extensions.ReplicaSet{rs("foo-v2", 7, nil, newTimestamp), rs("foo-v1", 3, nil, oldTimestamp)},

			expectedNew: nil,
			expectedOld: []*extensions.ReplicaSet{rs("foo-v2", 10, nil, newTimestamp), rs("foo-v1", 4, nil, oldTimestamp)},
		},
	}

	for _, test := range tests {
		_ = olderTimestamp
		t.Log(test.name)
		fake := fake.Clientset{}
		dc := &DeploymentController{
			client:        &fake,
			eventRecorder: &record.FakeRecorder{},
		}

		if test.newRS != nil {
			desiredReplicas := test.oldDeployment.Spec.Replicas
			if desired, ok := test.desiredReplicasAnnotations[test.newRS.Name]; ok {
				desiredReplicas = desired
			}
			deploymentutil.SetReplicasAnnotations(test.newRS, desiredReplicas, desiredReplicas+deploymentutil.MaxSurge(*test.oldDeployment))
		}
		for i := range test.oldRSs {
			rs := test.oldRSs[i]
			if rs == nil {
				continue
			}
			desiredReplicas := test.oldDeployment.Spec.Replicas
			if desired, ok := test.desiredReplicasAnnotations[rs.Name]; ok {
				desiredReplicas = desired
			}
			deploymentutil.SetReplicasAnnotations(rs, desiredReplicas, desiredReplicas+deploymentutil.MaxSurge(*test.oldDeployment))
		}

		if err := dc.scale(test.deployment, test.newRS, test.oldRSs); err != nil {
			t.Errorf("%s: unexpected error: %v", test.name, err)
			continue
		}

		// Construct the nameToSize map that will hold all the sizes we got our of tests
		// Skip updating the map if the replica set wasn't updated since there will be
		// no update action for it.
		nameToSize := make(map[string]int32)
		if test.newRS != nil {
			nameToSize[test.newRS.Name] = test.newRS.Spec.Replicas
		}
		for i := range test.oldRSs {
			rs := test.oldRSs[i]
			nameToSize[rs.Name] = rs.Spec.Replicas
		}
		// Get all the UPDATE actions and update nameToSize with all the updated sizes.
		for _, action := range fake.Actions() {
			rs := action.(testclient.UpdateAction).GetObject().(*extensions.ReplicaSet)
			if !test.wasntUpdated[rs.Name] {
				nameToSize[rs.Name] = rs.Spec.Replicas
			}
		}

		if test.expectedNew != nil && test.newRS != nil && test.expectedNew.Spec.Replicas != nameToSize[test.newRS.Name] {
			t.Errorf("%s: expected new replicas: %d, got: %d", test.name, test.expectedNew.Spec.Replicas, nameToSize[test.newRS.Name])
			continue
		}
		if len(test.expectedOld) != len(test.oldRSs) {
			t.Errorf("%s: expected %d old replica sets, got %d", test.name, len(test.expectedOld), len(test.oldRSs))
			continue
		}
		for n := range test.oldRSs {
			rs := test.oldRSs[n]
			expected := test.expectedOld[n]
			if expected.Spec.Replicas != nameToSize[rs.Name] {
				t.Errorf("%s: expected old (%s) replicas: %d, got: %d", test.name, rs.Name, expected.Spec.Replicas, nameToSize[rs.Name])
			}
		}
	}
}