typing: fix a syntax error in mercurial/cext/bdiff.pyi
I noticed because `merge-pyi` on the non-cext implementations with this file as
input skipped the return type for this. `pytype-single --parse-pyi` confirmed
it was a problem.
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__)