import os
import unittest
from unittest.mock import patch

from user_engine.runtime import _required


class RequiredRuntimeValueTests(unittest.TestCase):
    def test_normalizes_secret_file_newline(self):
        with patch.dict(os.environ, {"USER_ENGINE_TEST_SECRET": "secret-value\n"}):
            self.assertEqual(_required("USER_ENGINE_TEST_SECRET"), "secret-value")

    def test_rejects_whitespace_only_value(self):
        with patch.dict(os.environ, {"USER_ENGINE_TEST_SECRET": " \n\t"}):
            with self.assertRaisesRegex(RuntimeError, "USER_ENGINE_TEST_SECRET is required"):
                _required("USER_ENGINE_TEST_SECRET")


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