@Override
    public List<ServiceInstance> getInstances(String serviceId) {
        final List<MicroServiceInstance> serverList = getRegisterCenterService().getServerList(serviceId);
        return serverList.stream().map(ServiceCombServiceInstance::new).collect(Collectors.toList());
    }
@Test
    public void getInstances() {
        final String serviceName = "test";
        final List<ServiceInstance> instances = client.getInstances(serviceName);
        Assert.assertNotNull(instances);
        Assert.assertEquals(instances.size(), this.instances.size());
        Assert.assertEquals(instances.get(0).getServiceId(), serviceName);
    }