def METHOD_NAME(self):
    assert Profile.objects.get_username_by_contact_email('a@a.com') is None
    user1 = self.user.username
    Profile.objects.add_or_update(user1, contact_email='a@a.com')
    assert Profile.objects.get_username_by_contact_email('a@a.com') == user1
    # user2 = self.admin.username
    # Profile.objects.add_or_update(user2, contact_email='a@a.com')
    # assert Profile.objects.get_username_by_contact_email('a@a.com') is None