Use the “Invalid Constraint” feature to prevent certain combinations of Values from appearing together in the same test case
In this example, Internet Explorer (IE) is not supported on Apple computers so it would be impossible for a tester to execute a test case that instructed her to launch IE from a Mac running on its native operating system. Accordingly, we do not want any tests generated to include combinations such as “OS X” and “IE8” in the same test case.
On the “Constraints” screen, you will need to click on two red X’s. Hover over the first Value of the Invalid Constraint and click on the red X that appears
Find the second Value that can never appear together with the first one, hover over it, and click on the red X to create your “Invalid Constraint”
Once you have entered your Invalid Constraints, you will see them listed to the left
After you enter these two Invalid Constraints, clicking on the “Scenarios” button will create a completely new set of test cases that excludes those two pairs of Values (and only those two pairs of Values). Each test with ‘OS X’ as the operating system will have a browser other than IE.
As you use the Invalid Constraint feature and the related Bound Constraint Feature keep in mind these usage tips:
Do you need to add a lot of Invalid Constraints?
Watch out for “Not Applicable” Values.