Method test_subclass_logger_cache

Lib/test/test_logging.py:5224–5253

(self)

        self.assertEqual(logging.getLoggerClass(), logging.Logger)

    def test_subclass_logger_cache(self):
        # bpo-37258
        message = []

        class MyLogger(logging.getLoggerClass()):
            def __init__(self, name='MyLogger', level=logging.NOTSET):
                super().__init__(name, level)
                message.append('initialized')

        logging.setLoggerClass(MyLogger)
        logger = logging.getLogger('just_some_logger')
        self.assertEqual(message, ['initialized'])
        stream = io.StringIO()
        h = logging.StreamHandler(stream)
        logger.addHandler(h)
        try:
            logger.setLevel(logging.DEBUG)
            logger.debug("hello")
            self.assertEqual(stream.getvalue().strip(), "hello")

            stream.truncate(0)
            stream.seek(0)

            logger.setLevel(logging.INFO)
            logger.debug("hello")
            self.assertEqual(stream.getvalue(), "")
        finally:
            logger.removeHandler(h)
            h.close()
            logging.setLoggerClass(logging.Logger)

    def test_logging_at_shutdown(self):
        # bpo-20037: Doing text I/O late at interpreter shutdown must not crash