from pathlib import Path

from simulator import load_params, run_simulation, write_run


def test_demo_run_produces_summary(tmp_path: Path) -> None:
    params = load_params()
    params["rounds"] = 3
    summary = run_simulation(params)
    assert summary.accepted + summary.rejected == 3
    assert 0.0 <= summary.acceptance_rate <= 1.0
    out = write_run(summary, params, tmp_path)
    assert out.exists()
    assert out.stat().st_size > 0