diff --git a/tests/test_downloadermiddleware_uriuserinfo.py b/tests/test_downloadermiddleware_uriuserinfo.py
index 4b430aeb8..5a0c12506 100644
--- a/tests/test_downloadermiddleware_uriuserinfo.py
+++ b/tests/test_downloadermiddleware_uriuserinfo.py
@@ -18,25 +18,33 @@ class BaseTestCase:
 
         def test_username_and_password(self):
             req = Request('{}://foo:bar@scrapytest.org/'.format(self.protocol))
-            assert self.mw.process_request(req, self.spider) is None
+            userinfoless_url = '{}://scrapytest.org/'.format(self.protocol)
+            processed_request = self.mw.process_request(req, self.spider)
+            assert processed_request.url == userinfoless_url
             self.assertEqual(req.meta[self.username_field], 'foo')
             self.assertEqual(req.meta[self.password_field], 'bar')
 
         def test_username_and_empty_password(self):
             req = Request('{}://foo:@scrapytest.org/'.format(self.protocol))
-            assert self.mw.process_request(req, self.spider) is None
+            userinfoless_url = '{}://scrapytest.org/'.format(self.protocol)
+            processed_request = self.mw.process_request(req, self.spider)
+            assert processed_request.url == userinfoless_url
             self.assertEqual(req.meta[self.username_field], 'foo')
             self.assertEqual(req.meta[self.password_field], '')
 
         def test_username_and_no_password(self):
             req = Request('{}://foo@scrapytest.org/'.format(self.protocol))
-            assert self.mw.process_request(req, self.spider) is None
+            userinfoless_url = '{}://scrapytest.org/'.format(self.protocol)
+            processed_request = self.mw.process_request(req, self.spider)
+            assert processed_request.url == userinfoless_url
             self.assertEqual(req.meta[self.username_field], 'foo')
             self.assertNotIn(self.password_field, req.meta)
 
         def test_empty_username_and_nonempty_password(self):
             req = Request('{}://:bar@scrapytest.org/'.format(self.protocol))
-            assert self.mw.process_request(req, self.spider) is None
+            userinfoless_url = '{}://scrapytest.org/'.format(self.protocol)
+            processed_request = self.mw.process_request(req, self.spider)
+            assert processed_request.url == userinfoless_url
             self.assertEqual(req.meta[self.username_field], '')
             self.assertEqual(req.meta[self.password_field], 'bar')
 
@@ -50,7 +58,9 @@ class BaseTestCase:
             req = Request(
                 '{}://foo%3A:b%40r@scrapytest.org/'.format(self.protocol)
             )
-            assert self.mw.process_request(req, self.spider) is None
+            userinfoless_url = '{}://scrapytest.org/'.format(self.protocol)
+            processed_request = self.mw.process_request(req, self.spider)
+            assert processed_request.url == userinfoless_url
             self.assertEqual(req.meta[self.username_field], 'foo:')
             self.assertEqual(req.meta[self.password_field], 'b@r')