Comment by devoutsalsa

Do something that is actually the type of work. If you need legacy code support, refactor some legacy code (it doesn't have to be YOUR code). If you need a vibe code product manager, do some vibe coding & project management for a sufficiently interesting use case. If you need a QA Engineer, give them a bug to solve & ask them to write a bug report.

Testing the skills people will use is less obvious than I realized. I could have communicated "do the work" more effectively as "test the actual skills people will use".