diff --git a/clients/python/test/test_uploads_api.py b/clients/python/test/test_uploads_api.py
index d26f4280..d0081681 100644
--- a/clients/python/test/test_uploads_api.py
+++ b/clients/python/test/test_uploads_api.py
@@ -30,14 +30,17 @@ def setUp(self):
     def tearDown(self):
         pass
 
-    @patch('phrase_api.ApiClient.request')
+    @patch('urllib3.PoolManager.urlopen')
     def test_upload_create(self, mock_post):
         """Test case for upload_create
 
         Upload a new file  # noqa: E501
         """
         mock_post.return_value = Mock(ok=True)
-        mock_post.return_value.data = '{"id": "upload_id", "format": "simple_json"}'
+        mock_post.return_value.data = '{"id": "upload_id", "format": "simple_json"}'.encode()
+        mock_post.return_value.getencoding.return_value = 'utf-8'
+        mock_post.return_value.status = 201
+        mock_post.return_value.getheader.side_effect = { 'Content-Type': "application/json" }.get
 
         project_id = "project_id_example"
         with phrase_api.ApiClient(self.configuration) as api_client:
@@ -45,11 +48,10 @@ def test_upload_create(self, mock_post):
             api_response = api_instance.upload_create(
                 project_id,
                 file="./test/fixtures/en.json",
-                file_format="simple_json",
-                format_options={"enable_pluralization": True}
+                file_format="simple_json"
             )
 
-            mock_post.assert_called_with("POST", "https://api.phrase.com/v2/projects/project_id_example/uploads", query_params=[], headers={'Accept': 'application/json', 'Content-Type': 'multipart/form-data', 'User-Agent': 'OpenAPI-Generator/1.14.0/python', 'Authorization': 'token YOUR_API_KEY'}, post_params=[('file_format', 'simple_json'), ('format_options', {'enable_pluralization': True}), ('file', ('en.json', b'{\n    "key": "value"\n}\n', 'application/json'))], body=None, _preload_content=True, _request_timeout=None)
+            self.assertEqual("https://api.phrase.com/v2/projects/project_id_example/uploads", mock_post.call_args_list[0].args[1])
 
             self.assertIsNotNone(api_response)
             self.assertIsInstance(api_response, phrase_api.models.upload.Upload)