Allows the setting of a custom method for cancelling tokens after a timespan, for use in testing. By default this will be a call to CancellationTokenSource.CancelAfter(timespan).

Allows the setting of a custom DateTimeOffset.UtcNow implementation for testing. By default this will be a call to UtcNow.

Allows the setting of a custom Thread.Sleep implementation for testing. By default this will use the CancellationToken's WaitHandle.

Allows the setting of a custom async Sleep implementation for testing. By default this will be a call to Delay taking a CancellationToken.

Allows the setting of a custom DateTime.UtcNow implementation for testing. By default this will be a call to UtcNow.

Resets the custom implementations to their defaults. Should be called during test teardowns.