Added assertion for admin change form's "save and continue editing" message.

tests/admin_views/tests.py

@@ -4755,9 +4755,18 @@ class UserAdminTest(TestCase):
             '_continue': '1',
         })
         new_user = User.objects.get(username='newuser')
-        self.assertRedirects(response, reverse('admin:auth_user_change', args=(new_user.pk,)))
+        new_user_url = reverse('admin:auth_user_change', args=(new_user.pk,))
+        self.assertRedirects(response, new_user_url, fetch_redirect_response=False)
         self.assertEqual(User.objects.count(), user_count + 1)
         self.assertTrue(new_user.has_usable_password())
+        response = self.client.get(new_user_url)
+        self.assertContains(
+            response,
+            '<li class="success">The user "<a href="%s">'
+            '%s</a>" was added successfully. You may edit it again below.</li>'
+            % (new_user_url, new_user),
+            html=True,
+        )
 
     def test_password_mismatch(self):
         response = self.client.post(reverse('admin:auth_user_add'), {