A way to have failing tests (basically inverting test results)

It'd be great if mysqltest could have failing tests report as ok and working tests as not ok.
Meaning, I want to have a test that makes sure that, for example, the query "SELECT * FROM passwords" fails with a specific error and does not succeed.

Sadly, there's only the issue type Bug. So this is what it's filed under. Please let me know if there's a better place for such suggestions or feature requests.