[Ironruby-core] "can't convert Subclass_..." when isolating an interface

[Nieve Gr]

Hello all,
I've been trying to use caricature to stub my services in my controllers
tests, now when I try to test this code:
public TestController(ITestService service)
{
    _service = service;
}

when my interface is:
public interface ITestService
{
    string GetContent();
}

like so:
s = isolate ITestService
s.when_receiving(:get_content).return('some content')
c = TestController.new s

I get the above mentioned error (see attachment)

Any ideas what I'm doing wrong?

Attachments:
http://www.ruby-forum.com/attachment/4902/error.jpg

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