Now returns the current time or the time to which it's been set.

ResumeSleeps causes time.Sleep to resume default behavior.

SetAndFreezeClock will set the value to be returned by Now.

Since returns the time elapsed since t, where the current time may have been frozen.

SkipSleeps causes time.Sleep to sleep for only a small, negligible duration.

Sleep either the specified duration or a small, negligible duration.

UnfreezeClock will revert clock.Now's behavior to delegating to time.Now.