Jitter returns a time.Duration between duration and duration + maxFactor * duration, to allow clients to avoid converging on periodic behavior.

Poll tries a condition func until it returns true, an error, or the timeout is reached.

WaitFor gets a channel from wait(), and then invokes c once for every value placed on the channel and once more when the channel is closed.

ErrWaitTimeout is returned when the condition exited without success.

ConditionFunc returns true if the condition is satisfied, or an error if the loop should be aborted.

WaitFunc creates a channel that receives an item every time a test should be executed and is closed when the last test should be invoked.