def METHOD_NAME(self):
    data01 = os.path.abspath(os.path.join(__file__, '..', 'data01'))
    contents = {
        path.name for path in MultiplexedPath(self.folder, data01).iterdir()
    }
    for remove in ('__pycache__', '__init__.pyc'):
        try:
            contents.remove(remove)
        except (KeyError, ValueError):
            pass
    self.assertEqual(
        contents,
        {'__init__.py', 'binary.file', 'subdirectory', 'utf-16.file', 'utf-8.file'},
    )