def run_tests(self, ret_value, result, mock_getdefaultlocale): """Run the main test. Args: ret_value (tuple): Return tuple of the locale.getdefaultlocale module result (unicode): Result we want to see mock_getdefaultlocale (MagicMock): Mock object """ mock_getdefaultlocale.return_value = ret_value lang = utils.get_default_lang() mock_getdefaultlocale.assert_called_once() self.assertEqual(lang, result)