Fixed #20541 -- don't raise db signals twice when creating superuser

django/contrib/auth/tests/test_models.py

@@ -5,6 +5,7 @@ from django.contrib.auth import get_user_model
 from django.contrib.auth.models import (Group, User, SiteProfileNotAvailable,
     UserManager)
 from django.contrib.auth.tests.utils import skipIfCustomUser
+from django.db.models.signals import post_save
 from django.test import TestCase
 from django.test.utils import override_settings
 from django.utils import six
@@ -140,3 +141,27 @@ class IsActiveTestCase(TestCase):
         user_fetched = UserModel._default_manager.get(pk=user.pk)
         # the attribute is always true for newly retrieved instance
         self.assertEqual(user_fetched.is_active, True)
+
+
+@skipIfCustomUser
+class TestCreateSuperUserSignals(TestCase):
+    """
+    Simple test case for ticket #20541
+    """
+    def post_save_listener(self, *args, **kwargs):
+        self.signals_count += 1
+
+    def setUp(self):
+        self.signals_count = 0
+        post_save.connect(self.post_save_listener, sender=User)
+
+    def tearDown(self):
+        post_save.disconnect(self.post_save_listener, sender=User)
+
+    def test_create_user(self):
+        User.objects.create_user("JohnDoe")
+        self.assertEqual(self.signals_count, 1)
+
+    def test_create_superuser(self):
+        User.objects.create_superuser("JohnDoe", "mail@example.com", "1")
+        self.assertEqual(self.signals_count, 1)