@Test
  public void shouldReadResourceSet() throws Exception {

    // Given
    ServerContext context = mock(ServerContext.class);
    ReadRequest request = mock(ReadRequest.class);
    given(request.getFields()).willReturn(Arrays.asList(new JsonPointer("/fred")));
    ResultHandler<Resource> handler = mock(ResultHandler.class);
    ResourceSetDescription resourceSet = new ResourceSetDescription();
    resourceSet.setDescription(json(object()));
    Promise<ResourceSetDescription, ResourceException> resourceSetPromise =
        Promises.newSuccessfulPromise(resourceSet);

    given(contextHelper.getRealm(context)).willReturn("REALM");
    given(contextHelper.getUserId(context)).willReturn("RESOURCE_OWNER_ID");
    given(
            resourceSetService.getResourceSet(
                context, "REALM", "RESOURCE_SET_ID", "RESOURCE_OWNER_ID", false))
        .willReturn(resourceSetPromise);

    // When
    resource.readInstance(context, "RESOURCE_SET_ID", request, handler);

    // Then
    verify(handler).handleResult(Matchers.<Resource>anyObject());
  }