For testing ClojureScript code I use cljs.test
with figwheel. It’s very cool, tests runs when
every .cljs file changed, but frequently output in DevTools is a mess. And it would be nice to
have highlighted code in expected/actual part.
Then I found a nice lib – cljs-devtools. For using it you need to add it to your project and configure Chrome DevTools.
It’s nice, but it doesn’t work with print/println, only with console.log. And only when clojure
data structures passed to console.log. cljs.test uses print and formatters for printing expected/actual. So
we need to hack cljs.test a bit. Assume your test runner looks like:
(ns ^:figwheel-always rerenderer.test
(:require [cljs.test :refer-macros [run-all-tests]]))
(enable-console-print!)
(run-all-tests #"rerenderer\..*-test")
And we need to redefine cljs/test.print-comparison:
(ns ^:figwheel-always rerenderer.test
(:require [cljs.test :refer-macros [run-all-tests] :as test]
[devtools.core :as devtools]))
(enable-console-print!)
(devtools/install!)
(defn print-comparison
[{:keys [expected actual]}]
(.log js/console "expected:" expected)
(.log js/console " actual:" actual))
(with-redefs [test/print-comparison print-comparison]
(run-all-tests #"rerenderer\..*-test"))
And that’s all, example output:
