def test_delete_next_when_none_playing():
playlist = Playlist()
playlist.add('123')
playlist.add('456')
assert playlist.current_path is None
playlist.delete(0)
playlist.jump_next()
assert playlist.current_path == '456'
playlist.jump_next()
assert playlist.current_path == '456'
def test_next():
playlist = Playlist()
playlist.add('123')
playlist.add('456')
assert playlist.current_path is None
playlist.jump_next()
assert playlist.current_path == '123'
playlist.jump_next()
assert playlist.current_path == '456'
playlist.jump_next()
assert playlist.current_path == '123'
def test_delete_next_when_playing_earlier():
playlist = Playlist()
playlist.add('123')
playlist.add('456')
playlist.add('789')
playlist.jump_next()
playlist.jump_next()
assert playlist.current_path == '456'
playlist.delete(0)
assert playlist.current_path == '456'
playlist.jump_next()
assert playlist.current_path == '789'
playlist.jump_next()
assert playlist.current_path == '456'
def test_delete_prev_when_playing_deleted():
playlist = Playlist()
playlist.add('123')
playlist.add('456')
playlist.add('789')
playlist.jump_next()
playlist.jump_next()
assert playlist.current_path == '456'
playlist.delete(1)
assert playlist.current_path == '456'
playlist.jump_prev()
assert playlist.current_path == '123'
playlist.jump_prev()
assert playlist.current_path == '789'