Issue #11277: finally fix Snow Leopard crash following r88460.

pitrou · pitrou · commit 543b7f3ee90b · 2011-02-22T21:42:56.000Z
(probably an OS-related issue with mmap)
diff --git a/Lib/test/test_zlib.py b/Lib/test/test_zlib.py
@@ -70,7 +70,7 @@ def setUp(self):
         with open(support.TESTFN, "wb+") as f:
             f.seek(_4G)
             f.write(b"asdf")
-            f.flush()
+        with open(support.TESTFN, "rb") as f:
             self.mapping = mmap.mmap(f.fileno(), 0, access=mmap.ACCESS_READ)
 
     def tearDown(self):
