Rhino Mocks receive argument, modify it and return?

Question

I'm trying to write something like this:

myStub.Stub(_ => _.Create(Arg<Invoice>.It.Anything)).Callback(i => { i.Id = 100; return i; }); 

I want to get actual object that passed to mock, modify it and return back.

Is this scenario possible with Rhino Mocks?

Answer 1

You could use the WhenCalled method like this:

myStub     .Stub(_ => _.Create(Arg<Invoice>.Is.Anything))     .Return(null) // will be ignored but still the API requires it     .WhenCalled(_ =>      {         var invoice = (Invoice)_.Arguments[0];         invoice.Id = 100;         _.ReturnValue = invoice;     }); 

and then you can create your stub as such:

Invoice invoice = new Invoice { Id = 5 }; Invoice result = myStub.Create(invoice); // at this stage result = invoice and invoice.Id = 100