I've just read this post (http://blog.thimbleweedpark.com/tester3000) on Thimbleweed Park's blog and found it very interesting.
TL;DR - Just like the old LucasFilm times, Ron Gilbert is implementing an "autoplay mode" where the game plays itself. At the time he and Aric Wilmunder made that to help themselves while showcasing, but turned out to be also a valuable testing tool.
I genuinely never thought about such thing for showcasing (which probably may even look odd if not scripted properly) and sure enough I also never imagined it applied to adventure games testing.
Did any of you ever try such thing with AGS, especially those of you who worked on large projects?
With the recent addition of Mouse.Click() and related script commands this should become even more interesting:
http://www.adventuregamestudio.co.uk/forums/index.php?topic=51050.msg636504472#msg636504472
(Shamelessly advertising new WIP build of AGS)