Updates test reports

util.clj

(ns test-diff.util
  (:require [clojure.test]
            [clojure.data]))

(defmethod clojure.test/assert-expr '= [msg form]
  (let [args (rest form)
        report (clojure.test/assert-predicate msg form)]
    (concat (butlast report)
            (list
             `(let [[f# s#] (clojure.data/diff ~@args)]
                (println "    diff:")
                (prn f#)
                (prn s#))
             (last report)))))