.tox/py3/lib/python3.7/site-packages/swh/auth/tests/app/apptest/models.py:11: in <module> class AppUser(OIDCUser): .tox/py3/lib/python3.7/site-packages/django/db/models/base.py:111: in __new__ "INSTALLED_APPS." % (module, name) E RuntimeError: Model class apptest.models.AppUser doesn't declare an explicit app_label and isn't in an application in INSTALLED_APPS.