tests/test_audit.py

import csv
import json

from pcmt.audit import corrupted_detector_drift, radius_ablation, replay_audit
from pcmt.pipeline import RunConfig, run_pipeline


def test_replay_audit_reconstructs_certificates(tmp_path):
    output = tmp_path / "run"
    run_pipeline(RunConfig(output=output, fixture_root=tmp_path / "fixtures", clips=3, edits=["none", "audio_shift"], use_gpu="cpu"))

    result = replay_audit(output)

    assert result["certificates_checked"] == 3 * 2 * 5
    assert result["mismatch_count"] == 0


def test_audit_sidecars_have_rows(tmp_path):
    output = tmp_path / "run"
    run_pipeline(RunConfig(output=output, fixture_root=tmp_path / "fixtures", clips=2, edits=["none", "crop"], use_gpu="cpu"))

    radius = radius_ablation(output, output / "radius.csv", radii=[0, 1])
    drift = corrupted_detector_drift(output, output / "drift.csv")

    assert radius["rows"] == 2 * 2 * 2 * 5
    assert drift["rows"] == 2 * 2 * 4 * 5
    with (output / "drift.csv").open("r", encoding="utf-8", newline="") as handle:
        rows = list(csv.DictReader(handle))
    assert any(row["variant"] == "hallucinate_audio" for row in rows)


def test_replay_audit_detects_certificate_hash_tampering(tmp_path):
    output = tmp_path / "run"
    run_pipeline(RunConfig(output=output, fixture_root=tmp_path / "fixtures", clips=2, edits=["none"], use_gpu="cpu"))
    cert_path = sorted((output / "certificates").glob("*.json"))[0]
    cert = json.loads(cert_path.read_text())
    cert["certificate_hash"] = "0" * 64
    cert_path.write_text(json.dumps(cert, indent=2, sort_keys=True))

    result = replay_audit(output)

    assert result["mismatch_count"] == 1
    assert result["mismatches"][0]["field"] == "certificate_hash"