@Test
public void testNoFilter() throws Exception {

  GetCompInstancesRequestProto req = GetCompInstancesRequestProto.newBuilder()
      .build();
  List<ComponentContainers> compContainers = FilterUtils.filterInstances(
      new MockRunningServiceContext(rule,
          TestServiceManager.createBaseDef("service")), req);
  Assert.assertEquals("num comps", 2, compContainers.size());
  compContainers.forEach(item -> {
    Assert.assertEquals("num containers", 2, item.getContainers().size());
  });
}