clock

type Clock interface {

	// Now returns the current local time.
	Now() time.Time

	// Sleep pauses the current goroutine for at least the duration d.
	// A negative or zero duration causes Sleep to return immediately.
	Sleep(d time.Duration)

	// After waits for the duration to elapse and then sends the current time
	// on the returned channel. It is equivalent to NewTimer(d).C.
	After(d time.Duration) <-chan time.Time

	// Tick is a convenience wrapper for NewTicker providing access to the
	// ticking channel only.
	Tick(d time.Duration) <-chan time.Time

	// Ticker returns a new Ticker containing a channel that will send the
	// time with a period specified by the duration argument. It adjusts
	// the intervals or drops ticks to make up for slow receivers.
	// The duration d must be greater than zero; if not, Ticker will panic.
	Ticker(d time.Duration) *time.Ticker
}

type Mock interface {
	Clock

	// Set applies the passed-in time to the Clock's time.
	Set(t time.Time) Mock

	// Add changes the Clock's time by the passed-in duration.
	Add(d time.Duration) Mock

	// Freeze stops the clock's time.
	Freeze() Mock

	// IsFrozen is whether the clock's time is stopped.
	IsFrozen() bool

	// Unfreeze starts the clock's time again.
	Unfreeze() Mock

	Close()
}