How to use the spotdl.downloader function in spotdl

def test_check_track_exists_after_download():
    expect_check = True
    track_existence = downloader.CheckExists(file_name, meta_tags)
    check = track_existence.already_exists(TRACK_URL)
    os.remove(track_path + ".mp3")
    assert check == expect_check

def test_check_track_exists_after_download(
    metadata_fixture, filename_fixture, trackpath_fixture
):
    expect_check = True
    track_existence = downloader.CheckExists(filename_fixture, metadata_fixture)
    check = track_existence.already_exists(SPOTIFY_TRACK_URL)
    os.remove(trackpath_fixture + ".mp3")
    assert check == expect_check

def test_check_exists(metadata_fixture, filename_fixture, tmpdir):
    expect_check = False
    const.args.folder = str(tmpdir)
    # prerequisites for determining filename
    track_existence = downloader.CheckExists(filename_fixture, metadata_fixture)
    check = track_existence.already_exists(TRACK_SEARCH)
    assert check == expect_check

def test_check_track_exists_before_download(tmpdir):
    expect_check = False
    const.args.folder = str(tmpdir)
    # prerequisites for determining filename
    songname = internals.format_string(const.args.file_format, meta_tags)
    global file_name
    file_name = internals.sanitize_title(songname)
    track_existence = downloader.CheckExists(file_name, meta_tags)
    check = track_existence.already_exists(TRACK_URL)
    assert check == expect_check

def match_args():
    if const.args.song:
        for track in const.args.song:
            track_dl = downloader.Downloader(raw_song=track)
            track_dl.download_single()
    elif const.args.list:
        if const.args.write_m3u:
            youtube_tools.generate_m3u(track_file=const.args.list)
        else:
            list_dl = downloader.ListDownloader(
                tracks_file=const.args.list,
                skip_file=const.args.skip,
                write_successful_file=const.args.write_successful,
            )
            list_dl.download_list()
    elif const.args.playlist:
        spotify_tools.write_playlist(playlist_url=const.args.playlist)
    elif const.args.album:
        spotify_tools.write_album(album_url=const.args.album)
    elif const.args.all_albums:
        spotify_tools.write_all_albums_from_artist(artist_url=const.args.all_albums)
    elif const.args.username:
        spotify_tools.write_user_playlist(username=const.args.username)

def match_args():
    if const.args.song:
        for track in const.args.song:
            track_dl = downloader.Downloader(raw_song=track)
            track_dl.download_single()
    elif const.args.list:
        if const.args.write_m3u:
            youtube_tools.generate_m3u(track_file=const.args.list,
                                       text_file=const.args.write_to)
        else:
            list_dl = downloader.ListDownloader(
                tracks_file=const.args.list,
                skip_file=const.args.skip,
                write_successful_file=const.args.write_successful,
            )
            list_dl.download_list()
    elif const.args.playlist:
        spotify_tools.write_playlist(playlist_url=const.args.playlist,
                                     text_file=const.args.write_to)
    elif const.args.album:
        spotify_tools.write_album(album_url=const.args.album,
                                  text_file=const.args.write_to)
    elif const.args.all_albums:
        spotify_tools.write_all_albums_from_artist(artist_url=const.args.all_albums,
                                                   text_file=const.args.write_to)
    elif const.args.username:
        spotify_tools.write_user_playlist(username=const.args.username,

def match_args():
    if const.args.song:
        for track in const.args.song:
            track_dl = downloader.Downloader(raw_song=track)
            track_dl.download_single()
    elif const.args.list:
        if const.args.write_m3u:
            youtube_tools.generate_m3u(track_file=const.args.list,
                                       text_file=const.args.write_to)
        else:
            list_dl = downloader.ListDownloader(
                tracks_file=const.args.list,
                skip_file=const.args.skip,
                write_successful_file=const.args.write_successful,
            )
            list_dl.download_list()
    elif const.args.playlist:
        spotify_tools.write_playlist(playlist_url=const.args.playlist,
                                     text_file=const.args.write_to)
    elif const.args.album:

def match_args():
    if const.args.song:
        for track in const.args.song:
            track_dl = downloader.Downloader(raw_song=track)
            track_dl.download_single()
    elif const.args.list:
        if const.args.write_m3u:
            youtube_tools.generate_m3u(track_file=const.args.list)
        else:
            list_dl = downloader.ListDownloader(
                tracks_file=const.args.list,
                skip_file=const.args.skip,
                write_successful_file=const.args.write_successful,
            )
            list_dl.download_list()
    elif const.args.playlist:
        spotify_tools.write_playlist(playlist_url=const.args.playlist)
    elif const.args.album:
        spotify_tools.write_album(album_url=const.args.album)
    elif const.args.all_albums: