import json
import shutil
import subprocess
import unittest
from pathlib import Path


class FrontendBuildIsolationTests(unittest.TestCase):
    def test_development_and_production_assets_do_not_collide(self):
        root = Path(__file__).resolve().parents[1]
        script = "import config from './next.config.mjs'; import c from 'next/constants.js'; console.log(JSON.stringify([config(c.PHASE_DEVELOPMENT_SERVER),config(c.PHASE_PRODUCTION_BUILD),config(c.PHASE_PRODUCTION_SERVER)]));"
        result = subprocess.run([shutil.which("node") or "node", "--input-type=module", "-e", script], cwd=root, capture_output=True, text=True, check=True)
        dev, build, start = json.loads(result.stdout)
        self.assertNotEqual(dev["distDir"], build["distDir"])
        self.assertEqual(build["distDir"], start["distDir"])


if __name__ == "__main__":
    unittest.main()