normalize email address

app/core/models.py

@@ -13,7 +13,7 @@ class UserManager(BaseUserManager):
     """Manager for users."""
 
     def create_user(self, email, password=None, **extra_fields):
-        user = self.model(email=email, **extra_fields)
+        user = self.model(email=self.normalize_email(email), **extra_fields)
         user.set_password(password)
         user.save(using=self._db)
 

app/core/tests/test_models.py

@@ -14,3 +14,14 @@ def test_create_user_with_email_successful(self):
 
         self.assertEqual(user.email, email)
         self.assertTrue(user.check_password(password))
+
+    def test_new_user_email_normalized(self):
+        sample_emails = [
+            ['[email protected]', '[email protected]'],
+            ['[email protected]', '[email protected]'],
+            ['[email protected]', '[email protected]'],
+            ['[email protected]', '[email protected]'],
+        ]
+        for email, expected in sample_emails:
+            user = get_user_model().objects.create_user(email, 'sample123')
+            self.assertEqual(user.email, expected)