I highly doubt this would be worth the manpower or the electricity bill.
It can take years to train an AI to play a specific game, in a specific way, in very controlled situations. I don’t think any of us wants Blizzard taking years to train an AI just to automate testing of a single boss encounter using a single class and spec and talent build and version of the game.
And they’d have to repeat the training for each spec of each class. We’re talking probably a decade or more just to train up an AI that could do any kind of effective testing on a single raid instance, and by then there’s probably going to be much better AI available that would replace it anyway.
Not to mention the fact that, you know, a decade is a very long time to wait for a single raid release. Talk about stalling development!
What a terrible thing that would be for them to try. Colossal waste of time, money, and development resources.