In my organization, we're trying to implement such a scenario whereby any Business user can add/update/modify any business rule thru Guvnor at any time without the knowledge of technical staff. After that that user should be able to do automated Regression testing to verify if the rule modification fails anywhere in the entire application.

We, at present are not sure how & using which testing tools that can be achieved. Are Fit/FitNesse any help in regression testing? Any suggestions in this regard are more than welcome.