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How can I use Rhino Mocks to inspect what values were passed to a method

Asked 2010-07-12T13:36:55.270
18

I'm new to mocking, and I'm having a hard time solving an issue with UnitTesting.

Say I have this code:

public class myClass{

    private IDoStuff _doer;

    public myClass(IDoStuff doer){
        _doer = doer;
    }

    public void Go(SomeClass object){

        //do some crazy stuff to the object

        _doer.DoStuff(object) //this method is  void too
    }
}

Ok, so I want to UNIT test the Go method. I don't care what the _doer object does to the object once is gets it.

HOWEVER, I do want to inspect what the _doer object has received.

in PSEUDO code I want to achieve this:

[Test]
public void MyTest()
{
    IDoStuff doer = Mocker.Mock<IDoStuff>();
    Guid id = Guid.NewGuid();

    //test Go method
    new MyClass(doer).Go(new SomeClass(){id = id});

    Assert.AreEqual(id,MockingFramework.Method(DoStuff).GetReceived<SomeClass>().id);
}

Is this possible using Rhino, and if so, how do I achieve it?

cheers

c# unit-testing mocking rhino-mocks
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2 Answers

27

With the new Arrange/Act/Assert syntax:

[Test]
public void MyTest()
{
    // arrange
    IDoStuff doer = MockRepository.GenerateStub<IDoStuff>();
    MyClass myClass = new Myclass(doer);
    Guid id = Guid.NewGuid();

    // act
    myClass.Go(new SomeClass(){id = id});

    // assert
    doer.AssertWasCalled(x => x.DoStuff(
        Arg<Someclass>.Matches(y => y.id == id)));
}
answered 2010-07-12T14:04:52.723
1

If you just want to test that the MyClass instance passes its parameter to doer.Go then you can just set up an expectation:

SomeClass obj = new SomeClass { id = id };

doer.Expect(d => d.DoStuff(obj));

//test go method
new MyClass(doer).Go(obj);

doer.VerifyAllExpectations();

However if you want to check that it passes some possibly different object with some particular value for a property, then you can use a constraint:

doer.Expect(d => d.DoStuff(null))
    .IgnoreArguments()
    .Constraints(Property.Value("Id", expectedId));
answered 2010-07-12T13:51:32.427

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