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How's this for the test (I added an explanatory comment, since it may look like it isn't testing anything to someone who isn't familiar with the issue):
 def test_strftime_format_check(self):
 # Test that strftime does not crash on invalid format strings
 # that may trigger a buffer overread. When not triggered,
 # strftime may succeed or raise ValueError depending on
 # the platform.
 for x in [ '', 'A', '%A', '%AA' ]:
 for y in range(0x0, 0x10):
 for z in [ '%', 'A%', 'AA%', '%A%', 'A%A%', '%#' ]:
 try:
 time.strftime(x * y + z)
 except ValueError:
 pass