def setUp(self):
        self.old_activation = getattr(settings, 'ACCOUNT_ACTIVATION_DAYS', None)
        if self.old_activation is None:
            settings.ACCOUNT_ACTIVATION_DAYS = 7
Create an instance of the default backend for use in testing,
dataset/ETHPy150Open nathanborror/django-registration/registration/tests/backends.py/DefaultRegistrationBackendTests.setUp