from __future__ import annotations

import json, tempfile, unittest
from concurrent.futures import ThreadPoolExecutor
from pathlib import Path
from cadfs_to_cdsl.reports import write_json


class ReportTests(unittest.TestCase):
    def test_parallel_json_writes_use_unique_temporary_paths(self):
        with tempfile.TemporaryDirectory() as temporary:
            path = Path(temporary) / "summary.json"
            with ThreadPoolExecutor(max_workers=8) as executor:
                list(executor.map(lambda index: write_json(path, {"index": index}), range(64)))

            payload = json.loads(path.read_text(encoding="utf-8"))
            self.assertIn(payload["index"], range(64))
            self.assertEqual(list(path.parent.glob(".summary.json.*.tmp")), [])


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