convert old fail* assertions to assert*
diff --git a/Lib/test/test_slice.py b/Lib/test/test_slice.py
index 640c8c0..2ecb59a 100644
--- a/Lib/test/test_slice.py
+++ b/Lib/test/test_slice.py
@@ -73,7 +73,7 @@
 
         obj = AnyClass()
         s = slice(obj)
-        self.assert_(s.stop is obj)
+        self.assertTrue(s.stop is obj)
 
     def test_indices(self):
         self.assertEqual(slice(None           ).indices(10), (0, 10,  1))