Part VIII. Testing a decision service using test scenarios

Having defined business rules is not a technical prerequisite for test scenarios, because the scenarios can test the defined data that constitutes the business rules. However, creating the rules first is helpful so that you can also test entire rules in test scenarios and so that the scenarios more closely match the intended decision service. For DMN-based test scenarios ensure that the DMN decision logic and its associated custom data types are defined for the decision service.