if len(newFailedPods) == 0 {
			return *backoff
		}

		backoff.failuresAfterLastSuccess = backoff.failuresAfterLastSuccess + int32(len(newFailedPods))
		lastFailureTime := getFinishedTime(newFailedPods[len(newFailedPods)-1])
		backoff.lastFailureTime = &lastFailureTime
		return *backoff

	} else {
		if len(newFailedPods) == 0 {
			backoff.failuresAfterLastSuccess = 0
			backoff.lastFailureTime = nil
			return *backoff

				failuresAfterLastSuccess: 0,
			},
		},
		"Empty backoff store with no success/failure": {
			storeInitializer: emptyStoreInitializer,
			newSucceededPods: []metav1.Time{},
			newFailedPods:    []metav1.Time{},
			wantBackoffRecord: backoffRecord{
				key:                      "key",
				failuresAfterLastSuccess: 0,
			},
		},
		"Empty backoff store with one success": {
			storeInitializer: emptyStoreInitializer,

                            if (fileLockContentionHandler.maybePingOwner(lockInfo.port, lockInfo.lockId, displayName, backoff.getTimer().getElapsedMillis() - lastPingTime, backoff.getSignal())) {
                                lastPingTime = backoff.getTimer().getElapsedMillis();

                    LOGGER.debug("Error while accessing remote repository {}. Waiting {}ms before next retry. {} retries left", repositoryName, backoff, maxTentativesCount - retries, failure);
                    try {
                        Thread.sleep(backoff);
                        backoff *= 2;
                    } catch (InterruptedException e) {
                        throw UncheckedException.throwAsUncheckedException(e);

				t.Errorf("pod %v is not in the backoff queue", podID)
			}

			// Check backoff duration.
			deadline := q.getBackoffTime(podInfo)
			backoff := deadline.Sub(timestamp)
			if backoff != step.wantBackoff {
				t.Errorf("got backoff %s, want %s", backoff, step.wantBackoff)
			}

			// Simulate routine that continuously flushes the backoff queue.
			cl.Step(time.Millisecond)

	StartedContainer        = "Started"
	FailedToCreateContainer = "Failed"
	FailedToStartContainer  = "Failed"
	KillingContainer        = "Killing"
	PreemptContainer        = "Preempting"
	BackOffStartContainer   = "BackOff"
	ExceededGracePeriod     = "ExceededGracePeriod"
)

// Pod event reason list
const (
	FailedToKillPod                = "FailedKillPod"
	FailedToCreatePodContainer     = "FailedCreatePodContainer"

	}
}

func retryWithExponentialBackOff(initialDuration time.Duration, fn wait.ConditionFunc) error {
	backoff := wait.Backoff{
		Duration: initialDuration,
		Factor:   3,
		Jitter:   0,
		Steps:    6,
	}
	return wait.ExponentialBackoff(backoff, fn)
}

func TestPluginRegistration(t *testing.T) {
	defer cleanup(t)

	pluginManager := newTestPluginManager(socketDir)

//     activeQ when their backoff periods complete.
//   - unschedulablePods holds pods that were already attempted for scheduling and
//     are currently determined to be unschedulable.
type PriorityQueue struct {
	*nominator

	stop  chan struct{}
	clock clock.Clock

	// pod initial backoff duration.
	podInitialBackoffDuration time.Duration
	// pod maximum backoff duration.

		pod            *v1.Pod
		oldObj, newObj interface{}
		expectedHint   framework.QueueingHint
		expectedErr    bool
	}{
		"backoff-wrong-old-object": {
			pod:          &v1.Pod{},
			oldObj:       "not-a-pod",
			expectedHint: framework.Queue,
			expectedErr:  true,
		},
		"backoff-wrong-new-object": {
			pod:          &v1.Pod{},
			newObj:       "not-a-pod",
			expectedHint: framework.Queue,
			expectedErr:  true,

	// server in these cases.
	go func() {
		// TODO: do we need max timeout for retry, seems meaningless to retry forever if it never succeed
		b := backoff.NewExponentialBackOff(backoff.DefaultOption())
		// context for both timeout and channel, whichever stops first, the context will be done
		ctx, cancel := context.WithCancel(context.Background())
		go func() {
			select {