@Override
    public void shutDown() throws NacosException {
        serviceInfoHolder.shutdown();
        clientProxy.shutdown();
        NotifyCenter.deregisterSubscriber(changeNotifier);
    }
@Test
    void testConstructorWithServerList() throws NacosException, NoSuchFieldException, IllegalAccessException {
        NacosNamingService namingService = new NacosNamingService("localhost");
        try {
            Field namespaceField = NacosNamingService.class.getDeclaredField("namespace");
            namespaceField.setAccessible(true);
            String namespace = (String) namespaceField.get(namingService);
            assertEquals(UtilAndComs.DEFAULT_NAMESPACE_ID, namespace);
        } finally {
            namingService.shutDown();
        }
    }