def METHOD_NAME(default_settings):
    file_index = create_fileindex_radar(
        parameter=DwdRadarParameter.RADOLAN_CDC,
        resolution=Resolution.HOURLY,
        period=Period.HISTORICAL,
        settings=default_settings,
    )
    assert not file_index.is_empty()
    urls = file_index.get_column("filename").to_list()
    assert all(
        PurePath(url).match("*/climate_environment/CDC/grids_germany/hourly/radolan/historical/bin/*/RW*.tar.gz")
        for url in urls
        if not url.endswith(".pdf")
    )