"""Unit tests for the pure helpers in harness.screenshot (Phase 3 U1).

The Playwright capture itself needs a live app (exercised in the U1 live demo); here we cover the
pure bits: the artifact path and the SCREENSHOT-hook resolution. Run cold:
  cc-ci-run -m pytest tests/unit/test_screenshot.py -q
"""

from __future__ import annotations

import os
import sys

sys.path.insert(0, os.path.join(os.path.dirname(__file__), "..", "..", "runner"))
from harness import screenshot as S  # noqa: E402


def test_screenshot_path():
    assert S.screenshot_path("/var/lib/cc-ci-runs/42") == "/var/lib/cc-ci-runs/42/screenshot.png"


def test_hook_none_when_absent():
    assert S._load_screenshot_hook(None) is None
    assert S._load_screenshot_hook({}) is None
    assert S._load_screenshot_hook({"SCREENSHOT": "not-callable"}) is None


def test_hook_returned_when_callable():
    def hook(page, domain, meta):
        pass

    assert S._load_screenshot_hook({"SCREENSHOT": hook}) is hook