That's a fun question. We don't necessarily have a common test case we run things against, but after big product launches, we do use Highlight to e.g. look at all sessions where a new feature is used.

One other thing that we have is an internal page that lets us simulate specific types of errors for debugging purposes. It looks like this: https://www.dropbox.com/scl/fi/0prnebmiip8huleaf1mub/Screen-...