Clojurians Log v2

Hi everyone. I have a question about testing a pub/sub system built on top of core.async (in Clojurescript). I have some code that looks vaguely like

(def my-events (a/chan))

(async/subscribe my-pub :topic-kw my-events)

(def event-happened (go-loop []
                      (when-let [event (async/<! my-events)]
                        (println "Got the event")
                        ... do side effect with event ...)))
                        
-----

(deftest
  (testing "the side effect happened"
    ... click that makes the side effect happen ...
    ... expectation that would be true if the side effect happened ...
    (println "Test over")))

It is complicated in cljs, because there is only a single thread, in order for the go loops to run your tests need to yield control of the thread

I haven't used it but I think the cljs port of clojure test has some kind of macro or something for making threading control around in async tests easier

Yeah.. I was wondering if that’s even possible. I’m pretty new to core.async, I’ve worked with JS quite a bit but always orchestrated stuff like this with promises before, so it’s a bit unfamiliar.

I came across the asynchttps://clojurescript.org/tools/testing#async-testing, but either I’m not using it properly or it doesn’t do what I think it does.