在Rhino模拟中未将对象设置为对象的实例

更新：3

我正在尝试模拟一种方法，该方法用于类通过工作单元创建其他类的新实例。当我尝试模拟返回固定数据的方法时，在调用getPage方法时，我得到的是空值而不是列表。

这是我的代码

[TestFixture()]
public class CustomerServiceTests
{
    private ICustomerService service;
    private IUnitOfWork mockUnitOfWork;
    private IGenericRepository<Entities.Customer> repository;

    private int customerId;
    private int ContactId;

    [SetUp()]
    public void Setup()
    {
        customerId = 1;
        ContactId = 1;
    }

  [Test()]
    public void GetCustomers_should_return_three_results()
    {
        mockUnitOfWork = MockRepository.GenerateMock<IUnitOfWork>();
        repository = MockRepository.GenerateMock<IGenericRepository<Entities.Customer>>();

        List<Entities.Customer> customerList = new List<Entities.Customer>
        {
            new Entities.Customer { Id = 1, CompanyName = "test1", ContractorId = 1 },
            new Entities.Customer { Id = 2, CompanyName = "test2", ContractorId = 2 },
            new Entities.Customer { Id = 3, CompanyName = "test3", ContractorId = 1 },
            new Entities.Customer { Id = 4, CompanyName = "test4", ContractorId = 1 },
            new Entities.Customer { Id = 5, CompanyName = "test5", ContractorId = 4 }
        };


        var IQueryableList = customerList.AsEnumerable();            
        mockUnitOfWork.Stub(uow => uow.CustomerRepository).Return(repository);




        repository.Stub(repo => repo.GetPaged()).Return(new ContentList<Entities.Customer> { List = IQueryableList, Total = customerList.Count });

        service = new CustomerService(mockUnitOfWork);

        var resultList = service.GetCustomers(new PageRequest {PageSize = 20, PageIndex = 1 });
        var total = resultList.Data.Total;
        Assert.AreEqual(10, total);
    }

服务代码的一部分返回null而不是提供的列表。

            customers = _service.CustomerRepository.GetPaged(filter, orderBy, pageRequest.PageSize, pageRequest.PageIndex, "CustomersContacts");