ioloop_test.py 文件源码

def test_spawn_callback(self):
        # An added callback runs in the test's stack_context, so will be
        # re-arised in wait().
        self.io_loop.add_callback(lambda: 1 / 0)
        with self.assertRaises(ZeroDivisionError):
            self.wait()
        # A spawned callback is run directly on the IOLoop, so it will be
        # logged without stopping the test.
        self.io_loop.spawn_callback(lambda: 1 / 0)
        self.io_loop.add_callback(self.stop)
        with ExpectLog(app_log, "Exception in callback"):
            self.wait()