ioloop_test.py 文件源码

def test_exception_logging_future(self):
        """The IOLoop examines exceptions from Futures and logs them."""
        with NullContext():
            @gen.coroutine
            def callback():
                self.io_loop.add_callback(self.stop)
                1 / 0
            self.io_loop.add_callback(callback)
            with ExpectLog(app_log, "Exception in callback"):
                self.wait()