var (
	// RandShuffle pseudo-randomizes the order of addresses.
	RandShuffle = rand.Shuffle
	// TimeAfterFunc allows mocking the timer for testing connection delay
	// related functionality.
	TimeAfterFunc = func(d time.Duration, f func()) func() {
		timer := time.AfterFunc(d, f)
		return func() { timer.Stop() }
	}
)