Eric,
There's a couple of things going on here:
- Without explicit use of cljs.test/async, go blocks don't appear to be
executed within cljs.test/deftest bodies with the version of Clojurescript
you're using (1.7.48). I don't know anything about this, or whether I'm
mischaracterizing the problem - only that I re-ran your code with 1.7.145,
and it behaves differently.
- Regardless, cljs.test/async will need to be used to hold up test
completion until you're done inside the go block. This won't matter much
when looking for print statements in a repl, but eventually you're going to
want to asynchronously fail the test and have it be reported correctly.
Something like this:
(deftest call-convert-with-exec
(testing "trying to exec a simple cmd command"
(let [ch (exec "ls -al")]
(print "so far so good")
(cljs.test/async
done
(go
(<! ch)
(print "end of go block")
(done))))))
(Will work without bumping the Clojurescript version, but upgrading and
using cljs.test/async seems like the right move).
Take care,
Moe
On Sun, Oct 18, 2015 at 9:33 PM, Eric Chaves <[email protected]> wrote:
> Hi folks,
>
> I'm learning cljs targeting nodejs and for that I'm trying to write a
> simple captcha generator code that makes use of imagemagick. This is
> something that I had done before in "pure" nodejs so I figured that would
> be a good starting point.
> My sample code is using doo as test runner
>
> I'd like call node's "child_process" function and wait for it to finish,
> so I wrote the function below after some github surfing:
>
> ;; src/simple-aws-captcha/core.cljs
> (ns simple-aws-captcha.core
> (:require [cljs-lambda.util :refer [async-lambda-fn]]
> [cljs.nodejs :as node]
> [cljs.core.async :as async])
> (:require-macros [cljs.core.async.macros :refer [go]]))
>
> (defn exec [cmd]
> (let [ch (async/chan)
> ps (node/require "child_process")]
> (.exec ps cmd (fn [err stdout]
> (if (nil? err)
> (async/put! ch stdout)
> (async/put! ch "error")
> )))
> ch))
>
>
> And to test it I wrote the following TDD code:
>
> ;; test/simple-aws-captcha/core_test.cljs
>
> (ns simple-aws-captcha.core-test
> (:require-macros [cljs.core.async.macros :refer [go alt!]])
> (:require [cljs.test :refer-macros [deftest is testing async run-tests]]
> [cljs.core.async :refer [>! <! chan put! take! timeout close!]]
> [simple-aws-captcha.core :refer [get-code get-image exec]]))
>
> (enable-console-print!)
>
> (deftest call-convert-with-exec
> (testing "trying to exec a simple cmd command"
> (let [ch (exec "ls -al")]
> (print "so far so good")
> (go
> (<! ch)
> (print "end of go block")))))
>
> When I ran the tests the "so far so good" string is printed, but I never
> got the command result not the "end of go block".
>
> What am I doing wrong here?
>
> Thanks in advance,
>
> Eric
>
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