Testing in Django: Testing signals and logging

Using Django
1

Hello!

Does anyone have a clue of how I can test the logging that is saved when a user_login_failed signal is sent?

  • Is the user_login_failed signal sent when the form validation fails?
  • Or is the signal sent when the authenticate() function fails?

This is the test case:

class TestLogUserLoggedInFailedSignal(TestCase):
    def setUp(self):
        self.factory = RequestFactory()
        self.signin_page_url = reverse("auth_app:signin")
        
        self.password = "TheWorldIsFlat123"
        self.user = baker.make(Member, username="test_user", password=self.password, is_active=False)
        self.account_settings = baker.make(AccountSettings, member=self.user)
        self.sign_in_history = baker.make(SignInHistory, user=self.user)
        self.user.set_password(self.password)
        self.user.save()
    
    @patch("auth_app.signals.user_login_failed")
    def test_user_login_failed_signal(self, mock_info_logger):
        with self.settings(DJANGO_ENV="Production"):
            request = self.factory.post(self.signin_page_url, {'username': self.user.username, 'password': 'WrongPassword'})
            user = authenticate(username=self.user.username, password="ThisIsAWrongPassword")
            request.user = AnonymousUser()
            
            form = AllowInactiveUsersToSignInForm(data={"username": self.user.username, "password": "WrongPassword"})
            self.assertFalse(form.is_valid())
            self.assertIsNone(user)
            
            mock_info_logger.assert_called()
            
            self.assertEqual(mock_info_logger.call_count, 1)

And this is what I want to test:

signin_failed_logger = logging.getLogger("failed_signin")
prod_or_dev = os.environ.get('DJANGO_ENV', 'development')

@receiver(user_login_failed)
def log_user_login_failed(credentials, request, **kwargs):
    if prod_or_dev == "production":
        signin_failed_logger.info(f'User login failed: {credentials.get("username")} from IP: {request.META.get("REMOTE_ADDR")}')
2

are you sure set failed_signin logger in settings.py?