The Denodo Testing tool is built in a way to do automated testing that can quickly identify if there is a mismatch between views before and after any changes. This way, the development team can be sure that no changes have adversely affected the results.
If you would like to get the mismatch between two views, you may create a view by doing a MINUS operation over both the views. Then execute this view to find the difference between the views.
Hope this helps!