Added tests for ContentType/Group/Permission.__str__().

tests/auth_tests/test_models.py

@@ -368,3 +368,15 @@ class AnonymousUserTests(SimpleTestCase):
     def test_check_password(self):
         with self.assertRaisesMessage(NotImplementedError, self.no_repr_msg):
             self.user.check_password('password')
+
+
+class GroupTests(SimpleTestCase):
+    def test_str(self):
+        g = Group(name='Users')
+        self.assertEqual(str(g), 'Users')
+
+
+class PermissionTests(TestCase):
+    def test_str(self):
+        p = Permission.objects.get(codename='view_customemailfield')
+        self.assertEqual(str(p), 'auth_tests | custom email field | Can view custom email field')

tests/contenttypes_tests/test_models.py

@@ -199,6 +199,10 @@ class ContentTypesTests(TestCase):
         ct_fetched = ContentType.objects.get_for_id(ct.pk)
         self.assertIsNone(ct_fetched.model_class())
 
+    def test_str(self):
+        ct = ContentType.objects.get(app_label='contenttypes_tests', model='site')
+        self.assertEqual(str(ct), 'site')
+
 
 class TestRouter:
     def db_for_read(self, model, **hints):