Add directory which contains known ref leaks. Some of these are likely to be system dependent (like test_gestalt).

Author: nnorwitz

Lib/test/leakers/README

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+This directory contains test cases that are known to leak references.
+The idea is that you can import these modules while in the interpreter
+and call the leak function repeatedly.  This will only be helpful if
+the interpreter was built in debug mode.  If the total ref count
+doesn't increase, the bug has been fixed.
+
+Here's an example interpreter session for test_gestalt which still leaks:
+
+>>> from test.leakers.test_gestalt import leak
+[24275 refs]
+>>> leak()
+[28936 refs]
+>>> leak()
+[28938 refs]
+>>> leak()
+[28940 refs]
+>>> 
+

Lib/test/leakers/__init__.py

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+
+import sys
+
+if sys.platform != 'darwin':
+    raise ValueError, "This test only leaks on Mac OS X'
+
+def leak():
+    # taken from platform._mac_ver_lookup()
+    from gestalt import gestalt
+    import MacOS
+
+    try:
+        gestalt('sysu')
+    except MacOS.Error:
+        pass

Lib/test/leakers/test_gestalt.py

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+
+# Test case taken from test_itertools
+# See http://mail.python.org/pipermail/python-dev/2005-November/058339.html
+
+from itertools import tee
+
+def leak():
+    def fib():
+        def yield_identity_forever(g):
+            while 1:
+                yield g
+        def _fib():
+            for i in yield_identity_forever(head):
+                yield i
+        head, tail, result = tee(_fib(), 3)
+        return result
+
+    x = fib()
+    x.next()