import unittest
from unittest.mock import patch

from modules import app_obd


class CarConnectedFlagTest(unittest.TestCase):
    def setUp(self):
        app_obd._car_ever_connected = False

    def tearDown(self):
        app_obd._car_ever_connected = False

    def test_was_ever_connected_reads_persisted_flag(self):
        with patch("modules.app_sql.get_setting", return_value="1"):
            self.assertTrue(app_obd.was_car_ever_connected())
            self.assertTrue(app_obd._car_ever_connected)

    def test_was_ever_connected_defaults_false(self):
        with patch("modules.app_sql.get_setting", return_value="0"):
            self.assertFalse(app_obd.was_car_ever_connected())

    def test_persist_car_connected_writes_setting(self):
        with patch("modules.app_sql.set_setting") as mock_set:
            app_obd._persist_car_connected()
            mock_set.assert_called_once_with("car_ever_connected", "1")


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