Patch by Christian Heimes to change self.assert_(x == y) into
self.assertEqual(x, y).  (Christian used self.failUnlessEqual(),
but the double negative makes it hard to grok, so I changed it.)
diff --git a/Lib/test/test_sys.py b/Lib/test/test_sys.py
index e72b7f8..7d7a09b 100644
--- a/Lib/test/test_sys.py
+++ b/Lib/test/test_sys.py
@@ -301,7 +301,7 @@
     def test_43581(self):
         # Can't use sys.stdout, as this is a cStringIO object when
         # the test runs under regrtest.
-        self.assert_(sys.__stdout__.encoding == sys.__stderr__.encoding)
+        self.assertEqual(sys.__stdout__.encoding, sys.__stderr__.encoding)
 
     def test_intern(self):
         self.assertRaises(TypeError, sys.intern)