func TestJitterUntil(t *testing.T) {
	ch := make(chan struct{})
	// if a channel is closed JitterUntil never calls function f
	// and returns immediately
	close(ch)
	JitterUntil(func() {
		t.Fatal("should not have been invoked")
	}, 0, 1.0, true, ch)

	ch = make(chan struct{})
	called := make(chan struct{})
	go func() {
		JitterUntil(func() {
			called <- struct{}{}
		}, 0, 1.0, true, ch)
		close(called)
	}()

	ctx, cancel := context.WithCancel(ctx)
	defer cancel()
	succeeded := false
	desc := le.config.Lock.Describe()
	klog.Infof("attempting to acquire leader lease %v...", desc)
	wait.JitterUntil(func() {
		succeeded = le.tryAcquireOrRenew(ctx)
		le.maybeReportTransition()
		if !succeeded {
			klog.V(4).Infof("failed to acquire lease %v", desc)
			return
		}

	resourceName := e.DefaultQualifiedResource.String()
	klog.V(2).InfoS("Monitoring resource count at path", "resource", resourceName, "path", "<storage-prefix>/"+prefix)
	stopCh := make(chan struct{})
	go wait.JitterUntil(func() {
		count, err := e.Storage.Count(prefix)
		if err != nil {
			klog.V(5).InfoS("Failed to update storage count metric", "err", err)
			count = -1
		}

		//
		// Introduce some small jittering to ensure that over time the requests won't start
		// accumulating at approximately the same time from the set of nodes due to priority and
		// fairness effect.
		go wait.JitterUntil(kl.syncNodeStatus, kl.nodeStatusUpdateFrequency, 0.04, true, wait.NeverStop)
		go kl.fastStatusUpdateOnce()

		// start syncing lease
		go kl.nodeLeaseController.Run(context.Background())
	}