Resource.Type type = Resource.Type.Stack;
AmbariManagementController managementController = createMock(AmbariManagementController.class);
Set<StackResponse> allResponse = new HashSet<StackResponse>();
allResponse.add(new StackResponse("Stack1"));
allResponse.add(new StackResponse("Stack2"));
// set expectations
expect(managementController.getStacks(EasyMock.<Set<StackRequest>>anyObject())).andReturn(allResponse).once();
// replay