[py3] Ported django.utils.baseconv.

from unittest import TestCase

from django.utils.baseconv import base2, base16, base36, base56, base62, base64, BaseConverter

from django.utils.six.moves import xrange

class TestBaseConv(TestCase):

    def test_baseconv(self):

        nums = [-10 ** 10, 10 ** 10] + range(-100, 100)

        nums = [-10 ** 10, 10 ** 10] + list(xrange(-100, 100))

        for converter in [base2, base16, base36, base56, base62, base64]:

            for i in nums:

                self.assertEqual(i, converter.decode(converter.encode(i)))