@Override
    public void deregisterInstance(String serviceName, String ip, int port) throws NacosException {
        deregisterInstance(serviceName, ip, port, Constants.DEFAULT_CLUSTER_NAME);
    }
@Test
    void testDeregisterInstance6() throws NacosException {
        //given
        String serviceName = "service1";
        String groupName = "group1";
        Instance instance = new Instance();
        //when
        client.deregisterInstance(serviceName, groupName, instance);
        //then
        verify(proxy, times(1)).deregisterService(serviceName, groupName, instance);
    }