Index: Lib/test/test_zlib.py
===================================================================
--- Lib/test/test_zlib.py	(revisione 79549)
+++ Lib/test/test_zlib.py	(copia locale)
@@ -82,7 +82,7 @@
 
     def test_baddecompressobj(self):
         # verify failure on building decompress object with bad params
-        self.assertRaises(ValueError, zlib.decompressobj, 0)
+        self.assertRaises(ValueError, zlib.decompressobj, -1)
 
     def test_decompressobj_badflush(self):
         # verify failure on calling decompressobj.flush with bad params