def test_equality(self, album, track, artist_event):
a = AlbumEvent(album, track)
b = AlbumEvent(None, track)
c = AlbumEvent(album, track)
assert a != b != artist_event
assert hash(a) != hash(b) != hash(artist_event)
assert a is not b is not artist_event
assert a == c
def album_event(album, track):
return AlbumEvent(album, [track])