I do like the Midge-like DSL, but it's so unpredictable that I prefer not to use it. In fact, http://gitlab.com/mauricioszabo/check (my testing library) implements a DSL-like approach, but with a single macro that expects 3 args: actual, matcher, and expected. It also implements, with the same macro, a clojure-test based approach, so I can use it as (check (+ 1 2) => 3) or (check (=> 3 (+ 1 2))). Some people prefer the first, some prefer the second. I built this library for some reasons. First, because I wanted to use a midje-like library but most did not support ClojureScript that well at the time; second, because I wanted better errors (so there's even a defmatcher if none of the current matchers work); and third, because I needed async testing in ClojureScript, and most libraries get this wrong in some way or other...

I don't think Dragan uses Slack, but this seems like a worthy use of Midge: https://github.com/uncomplicate/clojure-sound/blob/master/test/clojure/uncomplicate/clojure_sound/sampled_test.clj