Cool, looking forward to reading it! Well, the post is already finished: http://ics.p.lodz.pl/~stolarek/blog/2012/10/code-testing-in-haskell/ I was just going to publish it and then your email came up on the list.
I hope you won't forget to cover SmallCheck in your article as well. Being also the maintainer of SmallCheck, I want it to steal some fame from QuickCheck :) Sorry to disappoint you, but I did not mention SmallCheck. So far I'm relying on QuickCheck and didn't feel like I need to look for other testing library. I might be wrong of course.
In theory I totally agree, but:
1. It's hard to guess at the moment how a good interface to the "pure golden" part should look like. 2. I'd rather avoid doing work when there's no demand. I guess these are valid points.
Jan