Disconnect the post_save signal handler to avoid test leakage

tests/test_authentication.py

@@ -348,6 +348,7 @@ def create_profile(sender, instance, created, **kwargs):
             self.assertEqual(user.last_name, "Doe")
             self.assertEqual(user.email, "john.doe@example.com")
             self.assertEqual(user.profile.employee_id, 182)
+        post_save.disconnect(create_profile, sender=User)
 
     @mock_adfs("2016")
     def test_authentication(self):