How to use the urlwatch.storage.CacheMiniDBStorage function in urlwatch

def prepare_retry_test():
    urls = os.path.join(os.path.dirname(os.path.dirname(__file__)), 'test', 'data', 'invalid-url.yaml')
    config = os.path.join(os.path.dirname(__file__), 'data', 'urlwatch.yaml')
    cache = os.path.join(os.path.dirname(__file__), 'data', 'cache.db')
    hooks = ''

    config_storage = YamlConfigStorage(config)
    cache_storage = CacheMiniDBStorage(cache)
    urls_storage = UrlsYaml(urls)

    urlwatch_config = TestConfig(config, urls, cache, hooks, True)
    urlwatcher = Urlwatch(urlwatch_config, config_storage, cache_storage, urls_storage)

    return urlwatcher, cache_storage

def test_run_watcher():
    urls = os.path.join(os.path.dirname(os.path.dirname(__file__)), 'share', 'urlwatch', 'examples', 'urls.yaml.example')
    config = os.path.join(os.path.dirname(__file__), 'data', 'urlwatch.yaml')
    cache = os.path.join(os.path.dirname(__file__), 'data', 'cache.db')
    hooks = ''

    config_storage = YamlConfigStorage(config)
    urls_storage = UrlsYaml(urls)
    cache_storage = CacheMiniDBStorage(cache)
    try:
        urlwatch_config = TestConfig(config, urls, cache, hooks, True)

        urlwatcher = Urlwatch(urlwatch_config, config_storage, cache_storage, urls_storage)
        urlwatcher.run_jobs()
    finally:
        cache_storage.close()