def test_controlcharacters(self):
        for i in range(128):
            c = chr(i)
            testString = "string containing %s" % c
            if i >= 32 or c in "\r\n\t":
                # \r, \n and \t are the only legal control chars in XML
                plistlib.dumps(testString, fmt=plistlib.FMT_XML)
            else:
                self.assertRaises(ValueError,
                                  plistlib.dumps,
                                  testString)