如何使用 LINQ 表达式 return 来自模拟存储库的新对象?

How do I return a new object from a mocked repository using a LINQ Expression?

我正在使用 Rhino Mocks 并创建了一个 Mock Repository。

var salesForcePolicies = MockRepository.GenerateMock<IRepository<SalesForcePolicy>>();

我有一个私有方法 return 来自存储库的 policy 项。

private SalesForcePolicy GetSalesForcePolicyByClientId(decimal clientId)
{
    var policy = salesForcePolicies.FindByExp(x => x.IdNumber == clientId).FirstOrDefault();
    if (policy == null) throw new AccountUpdaterException("Policy Not Found in Sales Force Lookup Table.");
    return policy;
}

我正在尝试将存储库获取到 return 一个新对象,当在 private 方法中调用查询时设置了一个 属性。我不想破坏封装并设置为 public virtual.

当我写这个的时候编译器在尖叫...

var clientId = decimal.Parse("123456");
salesForcePolicies.Stub(x => x.FindByExp(y => y.IdNumber == clientId)).Return(new SalesForcePolicy { PolicyNumber = "123456" });

如何在查询时将这个模拟存储库获取到 return 一个新对象?

Error: The best overloaded method match for 'Rhino.Mocks.Interfaces.IMethodOptions<System.Linq.IQueryable<Data.Models.Ussi.SalesForcePolicy>>.Return(System.Linq.IQueryable<Data.Models.Ussi.SalesForcePolicy>)' has some invalid arguments.

这个技巧是为表达式参数传入 null,然后使用 .IgnoreArguments()。对于 return 创建一个 new List<T>() 并调用 .AsQueryable().

[TestMethod]
public void Can_Mock_Sales_Force_Repo()
{
    // arrange
    var salesForcePolicyRepo = MockRepository.GenerateMock<IRepository<SalesForcePolicy>>();

    // act
    var clientId = decimal.Parse("123456");
    var salesForcePolicy = new SalesForcePolicy { PolicyNumber = "123456" };
    IEnumerable<SalesForcePolicy> salesForcePolicies = new List<SalesForcePolicy> { salesForcePolicy };
    salesForcePolicyRepo.Stub(x => x.FindByExp(null)).IgnoreArguments().Return(salesForcePolicies.AsQueryable());
    var policy = salesForcePolicyRepo.FindByExp(x => x.IdNumber == clientId).FirstOrDefault();

    // assert
    Assert.IsTrue(policy == salesForcePolicy);
}