Hi Miljenko,
>> I've posted a few questions here that were not answered at all, but I'll give a try with this one, hoping to get answer <<
Sorry this happened. Can you post the links of your other posts please? We also have a jbpm-users mailing list and als IRC which you may want to try in case you questions here are not getting traction for some reason.
You are right, the current Guvnor test scenario support is fairly limited. It for example does not support testing of CEP features and neither for jBPM5 processes. AFAIK there is noone currently involved in extending the Guvnor test scenarios to include fulle process testing support, and you can now write jUnit tests (which you seem to be doing) that pull the package pkg file from guvnor via KnowledgeAgent+changeset.xml and run them in your dev environment.
To try to get this included in future Guvnor versions, best thing would be to raise a Guvnor Jira and have people vote for it.
Hope this helps.