"""Runs the plain-node save-image helper test (tests/js/test_save_image.js).

Same thin pytest wrapper pattern as test_vision_overlay_js.py: shells out to
``node`` and asserts the script's own exit code. Skips (does not fail) when
node is not installed.

Covers gitea:Adriano/TieMeasureFlow#119.
"""
import shutil
import subprocess
from pathlib import Path

import pytest

FLASK_APP_DIR = Path(__file__).resolve().parent.parent
JS_TEST = Path(__file__).resolve().parent / "js" / "test_save_image.js"


def test_save_image_js_behaviour():
    node = shutil.which("node")
    if not node:
        pytest.skip("node non installato: test JS del salvataggio immagine saltato")

    result = subprocess.run(
        [node, str(JS_TEST)],
        cwd=str(FLASK_APP_DIR),
        capture_output=True,
        text=True,
        timeout=30,
    )

    assert result.returncode == 0, (
        f"tests/js/test_save_image.js fallito (exit {result.returncode})\n"
        f"stdout:\n{result.stdout}\nstderr:\n{result.stderr}"
    )