[Pharo-project] Advanced mocking or something like that

Hi all! I'm analazing a protocol for a pharo based robot-client, and i need two things: a) to test the protocol and the application (which have a complex conversational state management) b) to mock the application at all for debuggin without a robot conected. (ok, is pretty similar to a complex test) Is there any state-machine-like mock? or anything similar? Any one have a better idea to make this? Thanks! Santiago.