from signalcanvas_graph_based_market_signal_s.backtester import replay_deltas


def test_replay_deltas_basic():
    state = {"AAPL": 100.0, "MSFT": 200.0}
    deltas = [{"AAPL": -1.0}, {"MSFT": 5.0}, {"AAPL": 2.0}]
    new_state = replay_deltas(state, deltas)
    assert new_state["AAPL"] == 101.0
    assert new_state["MSFT"] == 205.0