test_datetime.py 文件源码

def test_backdoor_resistance(self):
        # For fast unpickling, the constructor accepts a pickle string.
        # This is a low-overhead backdoor.  A user can (by intent or
        # mistake) pass a string directly, which (if it's the right length)
        # will get treated like a pickle, and bypass the normal sanity
        # checks in the constructor.  This can create insane objects.
        # The constructor doesn't want to burn the time to validate all
        # fields, but does check the month field.  This stops, e.g.,
        # datetime.datetime('1995-03-25') from yielding an insane object.
        base = '1995-03-25'
        if not issubclass(self.theclass, datetime):
            base = base[:4]
        for month_byte in '9', chr(0), chr(13), '\xff':
            self.assertRaises(TypeError, self.theclass,
                                         base[:2] + month_byte + base[3:])
        for ord_byte in range(1, 13):
            # This shouldn't blow up because of the month byte alone.  If
            # the implementation changes to do more-careful checking, it may
            # blow up because other fields are insane.
            self.theclass(base[:2] + chr(ord_byte) + base[3:])

#############################################################################
# datetime tests