import importlib
import os
import unittest


class TestConfigEnvOverrides(unittest.TestCase):
    def setUp(self):
        self._old_env = dict(os.environ)

    def tearDown(self):
        os.environ.clear()
        os.environ.update(self._old_env)

    def test_council_models_override_from_env_csv(self):
        os.environ["COUNCIL_MODELS"] = "a,b, c"
        import backend.config as config

        importlib.reload(config)
        self.assertEqual(config.COUNCIL_MODELS, ["a", "b", "c"])

    def test_chairman_model_override(self):
        os.environ["CHAIRMAN_MODEL"] = "chair"
        import backend.config as config

        importlib.reload(config)
        self.assertEqual(config.CHAIRMAN_MODEL, "chair")

    def test_max_tokens_override(self):
        os.environ["MAX_TOKENS"] = "1234"
        import backend.config as config

        importlib.reload(config)
        self.assertEqual(config.MAX_TOKENS, 1234)