diff --git a/scrapy/trunk/scrapy/tests/test_http_response.py b/scrapy/trunk/scrapy/tests/test_http_response.py
index 71e87b8b7..2d7d0641f 100644
--- a/scrapy/trunk/scrapy/tests/test_http_response.py
+++ b/scrapy/trunk/scrapy/tests/test_http_response.py
@@ -11,6 +11,8 @@ class ResponseTest(TestCase):
         self.assertTrue(isinstance(Response('example.com', 'http://example.com/', body=None), Response))
         self.assertTrue(isinstance(Response('example.com', 'http://example.com/', body='body'), Response))
         self.assertRaises(AssertionError, Response, 'example.com', 'http://example.com/', body=ResponseBody('body', 'utf-8'))
+        # test presence of all optional parameters
+        self.assertTrue(isinstance(Response('example.com', 'http://example.com/', original_url='http://example.com/None', headers={}, status=200, body=None), Response))
 
 class ResponseBodyTest(TestCase):
     unicode_string = u'\u043a\u0438\u0440\u0438\u043b\u043b\u0438\u0447\u0435\u0441\u043a\u0438\u0439 \u0442\u0435\u043a\u0441\u0442'