diff --git a/test/objcache.py b/test/objcache.py
index 7342439..996ba47 100755
--- a/test/objcache.py
+++ b/test/objcache.py
@@ -2,9 +2,23 @@
 
 from llvm.core import *
 
-import logging, unittest
+import logging, sys, unittest
 
 class TestObjCache(unittest.TestCase):
+
+    if sys.version_info[:2] < (2, 7):
+        def assertIs(self, expr1, expr2, msg=None):
+            if expr1 is not expr2:
+                standardMsg = '%s is not %s' % (safe_repr(expr1),
+                                                safe_repr(expr2))
+                self.fail(self._formatMessage(msg, standardMsg))
+
+        def assertIsNot(self, expr1, expr2, msg=None):
+            if expr1 is expr2:
+                standardMsg = 'unexpectedly identical: %s' % (safe_repr(
+                                                                 expr1),)
+                self.fail(self._formatMessage(msg, standardMsg))
+
     def test_objcache(self):
         logging.debug("Testing module aliasing ..")
         m1 = Module.new('a')