from idea81_audioledger_studio_verifiable.delta import DeltaStore


def test_delta_and_apply():
    ds = DeltaStore()
    prev = {"A": 1, "B": 2}
    curr = {"A": 1, "B": 3}
    delta = ds.compute_delta(curr, prev)
    assert delta == {"B": 3}
    applied = ds.apply_delta(prev, delta)
    assert applied == curr