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    This makes an interesting contrast with the recently-posted http://michaelxavier.net/posts/2014-04-27-Cool-Idea-Free-Monads-for-Testing-Redis-Calls.html . Free Monads are superficially intimidating but they give you what’s ultimately a very general, very simple tool for testing anything (among other things). The mention of “arcane knowledge” also made me think of https://github.com/OlegIlyenko/hacking-scala-blog/blob/master/posts/scala-complexity-vs-book-of-magic-spells.md