How to use the watchgod.DefaultWatcher function in watchgod

def test_ignore_dir(tmpdir):
    mktree(tmpdir, tree)

    watcher = DefaultWatcher(str(tmpdir))

    sleep(0.01)
    tmpdir.join('foo/.git/abc').write('xxx')

    assert watcher.check() == set()

def test_ignore_file(tmpdir):
    mktree(tmpdir, tree)

    watcher = DefaultWatcher(str(tmpdir))

    sleep(0.01)
    tmpdir.join('foo/spam.pyc').write('foobar')

    assert watcher.check() == set()

return 1
    else:
        logger.info('%sbuild completed in %0.3fs', log_prefix, time() - start_time)
        return 0


def is_within(location: Path, directory: Path):
    try:
        location.relative_to(directory)
    except ValueError:
        return False
    else:
        return True


class HarrierWatcher(DefaultWatcher):
    def __init__(self, root_path):
        self._used_paths = str(CONFIG.pages_dir), str(CONFIG.theme_dir), str(CONFIG.data_dir)
        super().__init__(root_path)

    def should_watch_dir(self, entry):
        return super().should_watch_dir(entry) and entry.path.startswith(self._used_paths)


async def adev(config: Config, port: int, verbose: bool = False):
    global CONFIG
    CONFIG = config
    stop_event = asyncio.Event()
    loop = asyncio.get_event_loop()
    loop.add_signal_handler(signal.SIGINT, stop_event.set)
    loop.add_signal_handler(signal.SIGTERM, stop_event.set)