tests/test-dirs.py

py3: fix broken man page generation, it was generating `(default: NUL*)`

`bytes(default)` was producing things like `(default: \x00)` when handed
non-bytes values such as `1`, `10`, or `True`. The man page generation would
apparently ignore these bytes and produce man pages that had the string
`(default: )`.

Test Plan:
- Ran `cd doc; python3 gendoc.py "hg.1.gendoc"` and grepped for bad output
- Ran `make deb`, extracted the deb, manually inspected `hg.1` file.

Differential Revision: https://phab.mercurial-scm.org/D8639

from __future__ import absolute_import

import unittest

import silenttestrunner

from mercurial import pathutil


class dirstests(unittest.TestCase):
    def testdirs(self):
        for case, want in [
            (b'a/a/a', [b'a', b'a/a', b'']),
            (b'alpha/beta/gamma', [b'', b'alpha', b'alpha/beta']),
        ]:
            d = pathutil.dirs({})
            d.addpath(case)
            self.assertEqual(sorted(d), sorted(want))

    def testinvalid(self):
        with self.assertRaises(ValueError):
            d = pathutil.dirs({})
            d.addpath(b'a//b')


if __name__ == '__main__':
    silenttestrunner.main(__name__)