def test_updating_aggregates_clear(s):
        pl = Playlist(s.temp, "playlist")
        pl.extend(NUMERIC_SONGS)
        s.failUnless(pl.get("~#length"))

        pl.clear()
        s.failIf(pl.get("~#length"))
    def test_updating_aggregates_clear(s):
        pl = Playlist(s.temp, "playlist")
        pl.extend(NUMERIC_SONGS)
        s.failUnless(pl.get("~#length"))

        pl.clear()
        s.failIf(pl.get("~#length"))