@Override
	public List<ServiceInstance> getInstances(String service) {
		return polarisServiceDiscovery.getInstances(service);
	}
@Test
	public void testGetInstances() {

		when(polarisServiceDiscovery.getInstances(anyString()))
				.thenReturn(singletonList(mock(PolarisServiceInstance.class)));

		List<ServiceInstance> serviceInstances = client.getInstances(SERVICE_PROVIDER);

		assertThat(serviceInstances).isNotEmpty();
	}