from gridresilience_studio.core import PlanDelta
from gridresilience_studio.offline_sync import DeltaSyncEngine, DeltaStore, Object, Morphism
from gridresilience_studio.core import build_sample_world


def test_offline_sync_basic_delta_application():
    # Start with a small in-memory world
    ds = build_sample_world()
    engine = DeltaSyncEngine(ds)

    # Create a simple delta and apply
    delta = PlanDelta(delta_id="DELTA_TEST", islanded=False, actions=[{"type": "noop"}], tags={})
    engine.apply_delta(delta)

    # Validate that the delta was recorded in the local store
    assert any(d.delta_id == "DELTA_TEST" for d in engine.store.deltas)