Fixed web tests

tests/test_web.py

@@ -36,7 +36,7 @@ class TestWeb(TestCase):
         self.assertEqual(response.status_code, 404)
 
     @mock.patch(
-        'slinky.web.ShortURLForm',
+        'slinky.web.AddForm',
         return_value=mock.Mock(
             shortcode=mock.Mock(data=''),
             url=mock.Mock(data='https://example.com'),
@@ -49,5 +49,8 @@ class TestWeb(TestCase):
         """
         Ensure non-unique shortcode generation returns a 500 error
         """
+        request = mock.MagicMock()
+        request.headers = {'X-Forwarded-For': '127.0.0.1'}
+        with mock.patch("slinky.web.request", request):
             response = web.add()
         self.assertEqual(response.status_code, 500)