if now.Add(3 * time.Second).Before(time.Now()) {
		t.Errorf("JitterUntil did not returned after predefined period with negative jitter factor when the stop chan was closed inside the func")
	}
}

func TestExponentialBackoff(t *testing.T) {
	// exits immediately
	i := 0
	err := ExponentialBackoff(Backoff{Factor: 1.0}, func() (bool, error) {
		i++
		return false, nil
	})
	if err != ErrWaitTimeout || i != 0 {