@Override
    public boolean isSubscribed(String serviceName, String groupName, String clusters) throws NacosException {
        return redoService.isSubscriberRegistered(serviceName, groupName, clusters);
    }
@Test
    void testIsSubscribed() throws NacosException {
        SubscribeServiceResponse res = new SubscribeServiceResponse();
        ServiceInfo info = new ServiceInfo(GROUP_NAME + "@@" + SERVICE_NAME + "@@" + CLUSTERS);
        res.setServiceInfo(info);
        when(this.rpcClient.request(any())).thenReturn(res);
        assertFalse(client.isSubscribed(SERVICE_NAME, GROUP_NAME, CLUSTERS));
        client.subscribe(SERVICE_NAME, GROUP_NAME, CLUSTERS);
        assertTrue(client.isSubscribed(SERVICE_NAME, GROUP_NAME, CLUSTERS));
    }