How to test failing instance files

[toddhickerson]

How do you recommend setting up test fixtures that are designed to fail. For example, if the JSON Schema has the property as "required" but the instance file (test fixture) does not contain that property, the validation should fail. What if you want that failure to actually be a "success" as far as grunt is concerned since you designed that test to ensure that the required property is provided and fails validation when not present? (Think NUnit "Exception Expected".)

Do you have an example of how to do this with grunt-tv4?

And thanks for a really great plug-in!