assertTrue(target instanceof MonitorTarget, "Instance should be a MonitorTarget");
        assertTrue(target instanceof TimeoutTarget, "Instance should be a TimeoutTarget");
    }

    @Test
    public void test_expired_method_exists() throws Exception {
        assertNotNull(HotThreadMonitorTarget.class.getMethod("expired"), "expired method should exist");
    }

    @Test
    public void test_expired_method_can_be_called() {
        try {