How do I test "Parameters Passed In Final Call" using RhinoMocks? - rhino-mocks

Question

What's the best way in Rhino Mocks to test that a particular parameter is passed on the FINAL call to a method? Eg mockview.SetSomething(myObj) might be called any number of times by mockview.Init, but I want to test that the last time it's called as mockview.SetSomething(inParticular).
Now I know I can use GetArgumentsForCallsMadeOn with this, but my problem is that it doesn't work if I've subsequently changed the parameter holding variable. e.g
public interface IView
{
void SetSomething(ViewData data);
}
public class ViewData
{
public int Age { get; set; }
public string Name { get; set; }
public ViewData Person(int age, string name)
{
Age = age;
Name = name;
return (this);
}
}
public class WorkingPresenter
{
public void Init(IView view)
{
var data = new ViewData {Age = 1, Name = "One"};
view.SetSomething(data);
data = new ViewData {Age = 2, Name = "Two"};
view.SetSomething(data);
data = new ViewData {Age = 3, Name = "Three"};
}
}
public class NotWorkingPresenter
{
private ViewData _data;
public void Init(IView view)
{
_data = new ViewData();
view.SetSomething(_data.Person(1, "One"));
view.SetSomething(_data.Person(2, "Two"));
_data.Person(3, "Three");
}
}
then my tests are ...
[Test]
public void GetDataOfLastCall()
{
ViewData dummydata=null;
var view = MockRepository.GenerateStub<IView>();
//Approach 1 : This works
var workingPresenter = new WorkingPresenter();
workingPresenter.Init(view);
var lastCall = view.GetArgumentsForCallsMadeOn(v => v.SetSomething(dummydata)).Count - 1;
var lastParams = view.GetArgumentsForCallsMadeOn(v => v.SetSomething(dummydata))[lastCall];
var lastData = (ViewData)lastParams[0];
//Approach 2: This doesn't
var notWorkingPresenter = new NotWorkingPresenter();
notWorkingPresenter.Init(view);
lastCall = view.GetArgumentsForCallsMadeOn(v => v.SetSomething(dummydata)).Count - 1;
lastParams = view.GetArgumentsForCallsMadeOn(v => v.SetSomething(dummydata))[lastCall];
lastData = (ViewData)lastParams[0];
What I want is to verify that the last call to SetSomething was with {name="Two", age=2}. Now workingPresenter does this but wouldn't you expect notWorkingPresenter to do so too?

Answer 1

There must be something else going on in your code (outside of the mocking). I just threw together a few items:
public interface IView
{
void SetSomething(ViewData data);
}
public class ViewData
{
public int Age { get; set; }
public string Name { get; set; }
}
And I tested it with:
[TestMethod]
public void GetDataOfLastCall()
{
var view = MockRepository.GenerateStub<IView>();
var data = new ViewData {Age = 1, Name = "One"};
view.SetSomething(data);
data = new ViewData { Age = 2, Name = "Two" };
view.SetSomething(data);
data = new ViewData { Age = 3, Name = "Three" };
var lastCall = view.GetArgumentsForCallsMadeOn(v => v.SetSomething(data)).Count - 1;
var lastParams = view.GetArgumentsForCallsMadeOn(v => v.SetSomething(data))[lastCall];
var lastData = (ViewData) lastParams[0];
}
And I got the values of 2 and "Two" inside the ViewData. It appears Rhino.Mocks supports what you want to do. Could you create a failing test case that shows the issue identified in your original question (where you got a reference to the most recent information)?