How to use the inflect.BadChunkingOptionError function in inflect

'twelve, zero')
        self.assertEqual(numwords('120', group=2, zero='oh', one='unity'),
                         'twelve, oh')
        # TODO: ignoring 'one' param with group=2
        self.TODO(numwords('101', group=2, zero='oh', one='unity'),
                  'ten, unity',
                  'ten, one')
        self.assertEqual(numwords('555_1202', group=1, zero='oh'),
                         'five, five, five, one, two, oh, two')
        self.assertEqual(numwords('555_1202', group=1, one='unity'),
                         'five, five, five, unity, two, zero, two')
        self.assertEqual(numwords('123.456', group=1, decimal='mark', one='one'),
                         'one, two, three, mark, four, five, six')

        inflect.STDOUT_ON = False
        self.assertRaises(BadChunkingOptionError,
                          numwords, '1234', group=4)
        inflect.STDOUT_ON = True

)
        self.assertEqual(
            numwords("555_1202", group=1, zero="oh"),
            "five, five, five, one, two, oh, two",
        )
        self.assertEqual(
            numwords("555_1202", group=1, one="unity"),
            "five, five, five, unity, two, zero, two",
        )
        self.assertEqual(
            numwords("123.456", group=1, decimal="mark", one="one"),
            "one, two, three, mark, four, five, six",
        )

        inflect.STDOUT_ON = False
        self.assertRaises(BadChunkingOptionError, numwords, "1234", group=4)
        inflect.STDOUT_ON = True

'twelve, zero')
        self.assertEqual(numwords('120', group=2, zero='oh', one='unity'),
                         'twelve, oh')
        # TODO: ignoring 'one' param with group=2
        self.TODO(numwords('101', group=2, zero='oh', one='unity'),
                         'ten, unity',
                         'ten, one') 
        self.assertEqual(numwords('555_1202', group=1, zero='oh'),
                         'five, five, five, one, two, oh, two')
        self.assertEqual(numwords('555_1202', group=1, one='unity'),
                         'five, five, five, unity, two, zero, two')
        self.assertEqual(numwords('123.456', group=1, decimal='mark', one='one'),
                         'one, two, three, mark, four, five, six')

        inflect.STDOUT_ON = False
        self.assertRaises(BadChunkingOptionError, 
                          numwords, '1234', group=4)
        inflect.STDOUT_ON = True

num = "%s" % num

        # Handle "stylistic" conversions (up to a given threshold)...
        if threshold is not None and float(num) > threshold:
            spnum = num.split(".", 1)
            while comma:
                (spnum[0], n) = re.subn(r"(\d)(\d{3}(?:,|\Z))", r"\1,\2", spnum[0])
                if n == 0:
                    break
            try:
                return "{}.{}".format(spnum[0], spnum[1])
            except IndexError:
                return "%s" % spnum[0]

        if group < 0 or group > 3:
            raise BadChunkingOptionError
        nowhite = num.lstrip()
        if nowhite[0] == "+":
            sign = "plus"
        elif nowhite[0] == "-":
            sign = "minus"
        else:
            sign = ""

        myord = num[-2:] in ("st", "nd", "rd", "th")
        if myord:
            num = num[:-2]
        finalpoint = False
        if decimal:
            if group != 0:
                chunks = num.split(".")
            else: