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That… has nothing to do with pytest?

You’d probably use something like `wraps` or `side_effect` in `unittest.mock` to delegate to the original with some extra behaviours.

And / or use freezegun’s tick features, when you’re specifically dealing with time.

Replace the original function with a wrapper that calls the function then does the side effect.

This could effectively be something like a decorator.

As far as mocking time objects, look into pytest.freezegun. You should be able to control the date and time as you move forward.

I was able to mock out the datetime.now() at some point in the past. It wasn't with freezegun...

There are lots of good mocking fixtures available for pytest. I've used this one for clock stuff in the past: https://github.com/adamchainz/time-machine#pytest-plugin