Stub the behavior of a readOnly property

Question

public interface ICell
        {
            int Value{get;}

            void IncrementValue();
        }

I want to create a stub for this interface in RhinoMocks. I have a read only property and i want to increment his value every time i call the IncrementValue() method. Is this possible? I don't want to create a class new for this stub.

score 3 · Accepted Answer · answered Jan 08 '11 at 05:37

I have similar proposal to Jay, just shorter. Not sure if this have some drawbacks so.

   int count = 0;

    var mock = MockRepository.GenerateStub<ICell>();
    mock.Stub(p => p.Value).WhenCalled(a => a.ReturnValue = count).Return(42);
    mock.Stub(p => p.IncrementValue()).WhenCalled(a => {
        count = (int)count+1; 
    });

Return(42) is put there to say "Value returns something, don't throw" and WhenCalled(a => a.ReturnValue = count) overrides that return vale 42 with current value of the count.

SwDevMan81 · Answer 2 · 2011-01-08T02:51:08.963

0

You can give rhino mocks a lambda to run when a function get's called. This lambda can then increment a counter. You can find an example here

edited Jan 08 '11 at 02:51

answered Jan 08 '11 at 02:45

SwDevMan81

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i guess martin's problem is what to increment... the interface only has a get-property, no set – Pauli Østerø Jan 08 '11 at 02:56

score 0 · Answer 3 · answered Jan 08 '11 at 18:24

I came up with this too:

cell.Stub(c => c.Value).WhenCalled(m => m.ReturnValue = cell.GetArgumentsForCallsMadeOn(c => c.IncrementValue()).Count).Return(0);

Before your help i was confused with the behavior of WhenCalled method... but i think your approach is better than this one

Stub the behavior of a readOnly property

3 Answers3