from gridverse.delta_sync import DeltaSyncEngine


def test_delta_sync_write_and_replay():
    dse = DeltaSyncEngine()
    dse.write_delta("node-1", {"delta": 1})
    dse.write_delta("node-1", {"delta": 2})
    deltas = dse.replay("node-1")
    assert deltas[0]["delta"] == 1
    assert deltas[1]["delta"] == 2