c# - Rhino Mocks - 将 Expect.Call 用于具有两个签名的方法

Question

如何模拟具有两个签名的方法？

须藤代码:

public Class ClassA{
  //... do stuff
}

public Class ClassB{
  //... do stuff
}

public Class BigClass
{
  public BigClass(){}

  public ClassB MapMe(ClassA a)
  {
     //... do stuff
     return new ClassB();
  }

  public ClassA MapMe(ClassB a)  
  {
     //... do stuff    
     return new ClassA();
  }
}

public Class ClassToTest
{
  public void DoSomething()
  {
     var ResultA = BigClass.MapMe(new ClassA());

     //... do some more stuff

     ResultA = BigClass.MapMe(new ClassB());
  }
}

对于糟糕的代码示例，在 iPad 上执行此操作表示歉意，但希望能给您带来灵感。

Answer 1

只需使用 Argument Constraints

Argument constraints also define the method's signature by specifying the arguments types. That's why they can't be omitted.

mock.Expect(x => x.MapMe(Arg<ClassB>.Is.Anything).Return(resultB);
mock.Expect(x => x.MapMe(Arg<ClassA>.Is.Anything).Return(resultA);

编辑:

我相信您遇到了另一个问题 - 您在没有支持接口(interface)的情况下模拟了 BigClass，因此显然 RhinoMocks 不允许在这样的模拟上设置期望。所以只需通过接口(interface)抽象一个 BigClass 并基于它进行模拟:

public interface IMapper
{
    ClassB MapMe(ClassA entity);
    ClassA MapMe(ClassB entity);
}

public class BigClass : IMapper


[Test]
public void MapperTest()
{
    // !!! Below I've used WhenCalled() to show you that correct  
    // expectation is called based on argument type, just see in debugger
    IMapper mapperMock = MockRepository.GenerateMock<IMapper>();
    mapperMock.Expect(x => x.MapMe(Arg<ClassA>.Is.Anything))
              .WhenCalled((mi) =>
                        {
                            Debug.WriteLine("MapMe - ClassA parameter");
                        })
              .Return(null /*TODO: return correct instance*/);
    mapperMock.Expect(x => x.MapMe(Arg<ClassB>.Is.Anything))
              .WhenCalled((mi) =>
                        {
                            Debug.WriteLine("MapMe - ClassB parameter");
                        })
              .Return(null /*TODO: return correct instance*/);

    var resultB = mapperMock.MapMe(new ClassA());
    var resultA = mapperMock.MapMe(new ClassB());

   // TODO: Asserts
}