from pathlib import Path
import subprocess
import sys
import unittest


ROOT = Path(__file__).resolve().parents[1]
sys.path.insert(0, str(ROOT / 'app'))

import process_identity


@unittest.skipUnless(sys.platform.startswith('linux'), 'requires Linux pidfds')
class LinuxProcessIdentityTests(unittest.TestCase):
    def test_pidfd_is_bound_before_exact_identity_and_drives_termination(self):
        process = subprocess.Popen([
            sys.executable, '-I', '-S', '-B', '-c', 'import time; time.sleep(60)',
        ])
        try:
            retained = process_identity.open_process(process.pid, terminate=True)
            self.assertIsNotNone(retained._pidfd)
            self.assertEqual(retained.identity.pid, process.pid)
            retained.terminate()
            self.assertTrue(retained.wait(5))
            retained.close()
            process.wait(timeout=5)
            self.assertIsNotNone(process.returncode)
        finally:
            if process.poll() is None:
                process.kill()
                process.wait(timeout=5)


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