Index: Lib/test/test_zlib.py
===================================================================
--- Lib/test/test_zlib.py	(revisione 79541)
+++ Lib/test/test_zlib.py	(copia locale)
@@ -2,6 +2,7 @@
 from test import test_support
 import binascii
 import random
+from distutils import version
 
 zlib = test_support.import_module('zlib')
 
@@ -82,7 +83,10 @@
 
     def test_baddecompressobj(self):
         # verify failure on building decompress object with bad params
-        self.assertRaises(ValueError, zlib.decompressobj, 0)
+        if version.StrictVersion(zlib.ZLIB_VERSION) <= version.StrictVersion('1.2.4'):
+            self.assertRaises(ValueError, zlib.decompressobj, 0)
+        else:
+            self.assertRaises(ValueError, zlib.decompressobj, -1)
 
     def test_decompressobj_badflush(self):
         # verify failure on calling decompressobj.flush with bad params