After creating a virtual env and installing the requirements.txt packages:

(virtualenv)$ pytest

The tests located in user/test_user.py will save a UserChangeForm with 'is_superuser' = True and test if the superuser is added to the group Superuser.

The above is achieved by catching a post_save signal of the User model in user.signals.py.

The tests provided show that the necessary conditions for a successfull result are:

• The save call to be in a transaction.atomic()
• The use of transaction.on_commit().

Without either of those, the user will not be added to any groups.