from meshviz.crdt import DeltaCRDT


def test_merge_two_sources_merges_both_deltas():
    a = DeltaCRDT()
    b = DeltaCRDT()
    id_a = a.add_local_delta("dev1", 1.0, 10.0)
    id_b = b.add_local_delta("dev1", 2.0, 20.0)
    remote = b.export_state()
    a.merge(remote)
    state = a.export_state()
    assert "dev1" in state
    assert len(state["dev1"]) >= 2
    assert id_a in (d[2] for d in state["dev1"])  # ensure original delta_id present