Mariana Bedran Lesche
pytest-django's docs explain
that you can use the same behavior from Django's TransactionTestCase with @pytest.mark.django_db(transaction=True).
It will make test much slower, but can avoid errors in some cases.
Testing a post_delete signal that was supposed to delete a file from storage after a model instance was deleted, the
storage's delete method was never called. Looking at the signal's implemetation, it turns out the deletion happened
on commit. The code worked live, but not on tests because the tests never committed the transactions.