testing.py 文件源码

def run(self, result=None):
        logger = logging.getLogger()
        if not logger.handlers:
            logging.basicConfig()
        handler = logger.handlers[0]
        if (len(logger.handlers) > 1 or
                not isinstance(handler, logging.StreamHandler)):
            # Logging has been configured in a way we don't recognize,
            # so just leave it alone.
            super(LogTrapTestCase, self).run(result)
            return
        old_stream = handler.stream
        try:
            handler.stream = StringIO()
            gen_log.info("RUNNING TEST: " + str(self))
            old_error_count = len(result.failures) + len(result.errors)
            super(LogTrapTestCase, self).run(result)
            new_error_count = len(result.failures) + len(result.errors)
            if new_error_count != old_error_count:
                old_stream.write(handler.stream.getvalue())
        finally:
            handler.stream = old_stream