bpo-37685: Use singletons ALWAYS_EQ and NEVER_EQ in more tests. (GH-15167)

diff --git a/Lib/test/test_urllib2.py b/Lib/test/test_urllib2.py
index debb3c2..7b576db 100644
--- a/Lib/test/test_urllib2.py
+++ b/Lib/test/test_urllib2.py
@@ -634,17 +634,12 @@
             [("http_error_302")],
             ]
         handlers = add_ordered_mock_handlers(o, meth_spec)
-
-        class Unknown:
-            def __eq__(self, other):
-                return True
-
         req = Request("http://example.com/")
         o.open(req)
         assert len(o.calls) == 2
         calls = [(handlers[0], "http_open", (req,)),
                  (handlers[2], "http_error_302",
-                  (req, Unknown(), 302, "", {}))]
+                  (req, support.ALWAYS_EQ, 302, "", {}))]
         for expected, got in zip(calls, o.calls):
             handler, method_name, args = expected
             self.assertEqual((handler, method_name), got[:2])