// backoff at least 1ms, 2ms, 4ms, 8ms, 10ms, 10ms, 10ms
	durationFactors := []time.Duration{1, 2, 4, 8, 10, 10, 10}
	backoffMgr := NewExponentialBackoffManager(1*time.Millisecond, 10*time.Millisecond, 1*time.Hour, 2.0, 0.0, &clock.RealClock{})

	for i := range durationFactors {
		start := time.Now()
		<-backoffMgr.Backoff().C()
		passed := time.Since(start)
		if passed < durationFactors[i]*time.Millisecond {