def test_empty_constructor():
    p = Part()
    assert (p.n_measures == 1)
    assert (p.n_beats == 1)
    assert (p.n_note_on == 0)
def test_empty_constructor():
    p = Part()
    assert (p.n_measures == 1)
    assert (p.n_beats == 1)
    assert (p.n_note_on == 0)