Question

我在尝试使用RhinoMocks来确定是否在我的类中调用一个方法时遇到了一些问题，还调用了一定数量的其他方法。我的课程要测试：

public class OrderMessageHandler : IHandleMessages<UpdateOrder>
{

    public virtual IRepository Repository { get; set; }

    public void Handle(UpdateOrder message)
    {
        if (!message.Order.Confirmed) return;
        using (var om = new OperationManager())
        {
            try
            {
                om.BeginOperation();
                LVR.Order.Model.OrderHeader order = ConvertToLocalOrderHeader(message.Order);
                Repository.SaveUpdate(order);
                om.CommitOperation();
            }
            catch (Exception ex)
            {
                om.RollbackOperation();
                // other stuff here
            }
        }
    }

    internal virtual LVR.Order.Model.OrderHeader ConvertToLocalOrderHeader(Protocol.DTO.OrderHeader order)
    {
        // do stuff here, and call Repository.GetAll<Country>()
    }
}

这是我的测试方法

[Fact]
public void ConvertToLocalOrderHeader_GivenConfirmedOrderMessage_CallTheConversionMethods()
{
    // create a partial mock 'cause I want some of the implementation to be the true sut class
    var sut = MockRepository.GeneratePartialMock<OrderMessageHandler>();
    // create a stub for the repository, in order to avoid hitting the db
    sut.Repository = MockRepository.GenerateStub<IRepository>();
    sut.Repository.Stub(r => r.GetAll<Country>())
       .Return(
           new List<Country>
               {
                   new Country {CountryID = "IT", Description = "Italy"},
                   new Country {CountryID = "US", Description = "United States"}
               }.AsQueryable()
    );
    sut.Repository.Stub(r => r.SaveUpdate<OrderHeader>(Arg<OrderHeader>.Is.Anything));

    // call the method I want to test
    sut.Handle(new UpdateOrder
        {
            Order = order,
            EventId = new Guid(),
            EventTime = DateTime.Now
        });

    // verify that the method has been called (this is useless in my real test, I put it here just to understand why it doesn't work)
    sut.AssertWasCalled(s => s.Handle(Arg<UpdateOrder>.Is.Anything));
    // verify that an inner method (virtual) has been called during the execution of sut.handle()
    sut.AssertWasCalled(s => s.ConvertToLocalOrderHeader(order));                    
}

在2 sut.AssertWasCalled次调用中，我收到错误的对象引用未设置为对象的实例。。原因是sut.AssertWasCalled调用了方法，即验证......因此

sut.AssertWasCalled(s => s.Handle(Arg<UpdateOrder>.Is.Anything));

呼叫

sut.Handle(null)

如果该参数为null，则该方法抛出异常。太糟糕了，问题是它不应该重新调用该方法，而只是告诉我它是否在测试方法之前从未被调用过。这里有什么问题？

修改

根据评论中收到的建议，我尝试了一种不同的方法（假设我不喜欢期望/验证的味道）。这是测试方法：

[Fact]
public void ConvertToLocalOrderHeader_GivenConfirmedOrderMessage_CallTheConversionMethods2()
{
    var mocks = new MockRepository();
    var sut = mocks.PartialMock<OrderMessageHandler>();
    sut.Repository = mocks.Stub<IRepository>();
    sut.Repository.Stub(r => r.GetAll<Country>())
           .Return(
               new List<Country>
                   {
                       new Country {CountryID = "IT", Description = "Italy"},
                       new Country {CountryID = "US", Description = "United States"}
                   }.AsQueryable()
        );
    sut.Repository.Stub(r => r.SaveUpdate<OrderHeader>(Arg<OrderHeader>.Is.Anything));
    Expect.Call(() => sut.Handle(Arg<UpdateOrder>.Is.Anything));
    sut.Replay();
    sut.Handle(new UpdateOrder
        {
            Order = order,
            EventId = new Guid(),
            EventTime = DateTime.Now
        });
    mocks.VerifyAll();       
}

在这里，我有错误：

System.InvalidOperationException
Previous method 'OrderMessageHandler.get_Repository();' requires a return value or an exception to throw.

代码行引发错误

Expect.Call(() => sut.Handle(Arg<UpdateOrder>.Is.Anything));

所以，即使采用这种方法也没有运气......

还有其他想法吗？

Answer 1

我发现了问题所在：方法ConvertToLocalOrderHeader应至少声明为protected internal，以便让Rhinomocks覆盖它。 Virtual是不够的，作为测试类是一个不同的类。解决我需要花费数小时才能解决的问题的非常简单的解决方案：/

Rhinomocks：我不能正确使用AssertWasCalled

1 个答案: