from benchmark.statistics import run_mcnemar_test

def test_mcnemar_equal_outcomes():
    plain = [True, True, False, False]
    rif = [True, True, False, False]
    stats = run_mcnemar_test(plain, rif)
    assert stats["p_value"] == 1.0
    assert stats["statistic"] == 0.0
    assert stats["accuracy_difference"] == 0.0

def test_mcnemar_significant_diff():
    # RIF significantly outperforming Plain
    plain = [True] * 5 + [False] * 20
    rif = [True] * 20 + [False] * 5
    stats = run_mcnemar_test(plain, rif)
    assert stats["sample_size"] == 25
    assert stats["accuracy_difference"] == 0.6
    assert stats["ci_lower"] <= stats["accuracy_difference"] <= stats["ci_upper"]