Mocking Classes in Rhino.Mocks

[Andyk]

Hi all,
Can anyone help me with this? Im trying to figure out if I can mock a
concrete implementation? Or do I always have to mock against
interfaces.

I have a DataType which contains a Property to do some calculation.
This is based on a value return from a property from the
ParentCollection.
Im trying to unit test the DataType calculation, and wanting to mock
the ParentCollection property.
But it seemingly wont let me, unless I introduce an interface first.
Im trying to unit test legacy code, so breaking everything up and
introducing interfaces for all the datatypes is going to be alot of
work.

If I try to do something like:

ClientCollection mockCollection = mockery.StrictMock<ClientCollection>
();

When I call:
Expect.Call(mockCollection.TotalShares).return(100);

I get the following error:

Test method RhinoTestProject.ClientTest.ShouldTestMarketShares threw
exception: System.InvalidOperationException: Invalid call, the last
call has been used or no call has been made (make sure that you are
calling a virtual (C#) / Overridable (VB) method)..

And when I actually step through the test, its trying to call the
actual implementation rather than just return my mock value.


So is what Im trying to do possible?


Kinds regards


Andy

[Andyk]

I should add to this that I had looked at the Rhino.Mocks wiki, and
followed the examples. However it seems to be out of date as it
recommends CreateMock<T>. But the latest version says that CreateMock
is obselete and to use StrictMock.

[Ayende Rahien]

Is the method that you are trying to mock virtual?