Yes, as OpenRules decisioning facilities are oriented to business people, they may create test cases along with decision tables without help from developers.See the description in the User Manual
http://openrules.com/pdf/OpenRulesUserManual.pdf pp.29-31 and a sample project “DecisionPatientTherapyTest”. You do not need to know or write Java code - you simply create test data in the Excel tables of the type "Data" and put them together in the table "DecisionTableTest" with expected results. When you execute OpenRules-based decision in the test mode, it produces a report with all possible mismatches.