Remove e assertIs definitions and use correct assert* methods.
diff --git a/Lib/test/test_genericpath.py b/Lib/test/test_genericpath.py
index c8f359d..bfd38d9 100644
--- a/Lib/test/test_genericpath.py
+++ b/Lib/test/test_genericpath.py
@@ -5,9 +5,6 @@
 
 class AllCommonTest(unittest.TestCase):
 
-    def assertIs(self, a, b):
-        self.assertTrue(a is b)
-
     def test_commonprefix(self):
         self.assertEqual(
             genericpath.commonprefix([]),
@@ -50,8 +47,8 @@
             f.close()
             self.assertEqual(d, "foobar")
 
-            self.assertTrue(
-                genericpath.getctime(test_support.TESTFN) <=
+            self.assertLessEqual(
+                genericpath.getctime(test_support.TESTFN),
                 genericpath.getmtime(test_support.TESTFN)
             )
         finally: