Nice concept but does it work with real-world application.
I failed to understand how will it work with methods like `authenticate_user(user)` or `load_permissions_from_db(user, db)`.
For cases like that it would be best combined with a mock:
@auto_pytest()
def test_add(test_case, mocker):
mocker.patch('db.call')
test_case()
However, I would also note, that just because you have some methods that have potentially dangerous side effects, in most large code-bases, not all functions do. Which is why it operates at a function by function basis. You can use this for new pure functions, while continuing to write other tests in the same fashion by hand.