Yeah, sure, I do evaluative work just fine, but I don't think "build [non-trivial thing] with [fairly complex software or tools you've never used] while we watch you, you have 50 minutes" resembles that very much. The closest I've seen is situations along the lines of "meeting's in 50 minutes, could you find out about [thing similar enough to other things you've done or worked with that you are qualified to evaluate it on short notice]? I just learned we'll be talking about it in there and your take on [a couple specific aspects of it] would be useful." Not "you've never used this, I want a demo of [more than hello-world] in 50 minutes, or it's your ass", ever.