--- a/Lib/test/support.py	Sat Jul 28 22:16:39 2012 -0500
+++ b/Lib/test/support.py	Sun Jul 29 16:33:05 2012 +0200
@@ -23,6 +23,9 @@
 import sysconfig
 import fnmatch
 import logging.handlers
+import struct
+import tempfile
+import _testcapi
 
 try:
     import _thread, threading
@@ -984,6 +987,31 @@
     return final_opt and final_opt != '-O0'
 
 
+_header = '2P'
+if hasattr(sys, "gettotalrefcount"):
+    _header = '2P' + _header
+_vheader = _header + 'P'
+
+def calcobjsize(fmt):
+    return struct.calcsize(_header + fmt + '0P')
+
+def calcvobjsize(fmt):
+    return struct.calcsize(_vheader + fmt + '0P')
+
+
+_TPFLAGS_HAVE_GC = 1<<14
+_TPFLAGS_HEAPTYPE = 1<<9
+
+def check_sizeof(test, o, size):
+    result = sys.getsizeof(o)
+    # add GC header size
+    if ((type(o) == type) and (o.__flags__ & _TPFLAGS_HEAPTYPE) or\
+        ((type(o) != type) and (type(o).__flags__ & _TPFLAGS_HAVE_GC))):
+        size += _testcapi.SIZEOF_PYGC_HEAD
+    msg = 'wrong size for %s: got %d, expected %d' \
+            % (type(o), result, size)
+    test.assertEqual(result, size, msg)
+
 #=======================================================================
 # Decorator for running a function in a different locale, correctly resetting
 # it afterwards.