I would call those badly-written tests. The current date/time exists outside the system and ought to be acceptable for mocks, and in python we have things like freezegun that make it easy to control without the usual pitfalls of mocks.
What are those mock pitfalls, which are avoided by freezegun which is a mock according even to them? IoC and Clocks solve the same problem. So what are the pitfalls of using those instead of this other mock?
