Fair enough. If you want to mock time differentials like that, I see that one could use something to mock that. However, what you probably ideally would want to

Fair enough. If you want to mock time differentials like that, I see that one could use something to mock that. However, what you probably ideally would want to mock are the order of events, and not certain language-specific stdlib-calls. Though would depend how explicit you want to define your domain.