def test_write_section(self):

       tempdir = temppath.ensure('dirwriter', dir=True)

       dw = self.get_filled_writer(DirWriter, tempdir)

->     fpaths = tempdir.listdir('*.txt')

       assert len(fpaths) == 2

       assert sorted([f.basename for f in fpaths]) == ['bar.txt', 'foo.txt']

       assert _nl(tempdir.join('foo.txt').read()) == 'foo data\n'

       assert _nl(tempdir.join('bar.txt').read()) == 'bar data\n'

   def listdir(self, fil=None, sort=None):

       """ list directory contents, possibly filter by the given fil func

               and possibly sorted.

           """

       if isinstance(fil, str):

           fil = common.fnmatch(fil)

       res = []

       for name in self._callex(os.listdir, self.strpath):

->         childurl = self.join(name)

           if fil is None or fil(childurl):

               res.append(childurl)

       if callable(sort):

           res.sort(sort)

       elif sort:

           res.sort()

       return res