Locating the Test Cases Node 
In the Project Explorer view, expand the rules composer DC node, the Rules Modeling node to view the Test Cases node.
In the Project Explorer view, expand the process composer DC node and the Rulesets node to view the Test Cases node.
Note
Make sure you are in the Process Development perspective.
To open the Process Development perspective:
In SAP NetWeaver Developer Studio, choose
In the dialog box that appears, choose Process Development and choose OK.
You should see the Test Cases node only when you create a ruleset in the process composer DC.