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TESTING.md

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Testing Support

Lein-cljsbuild has built-in support for running external ClojureScript test processes. Test commands are configured via the :test-commands map. Each key in this map names a test command, and each value is a vector representing a shell command to run for that test:

(defproject lein-cljsbuild-example "1.2.3"
  :plugins [[lein-cljsbuild "0.2.6"]]
  :cljsbuild {
    :test-commands
      {"my-test" ["phantomjs" "phantom/unit-test.js" "..."]})

This example creates one test named "my-test", that will run phantomjs with a couple of arguments. The following command will run this test:

$ lein cljsbuild test my-test

Alternately, this command will run all configured tests:

$ lein cljsbuild test

If hooks are enabled, this will also result in the tests being run:

$ lein test

Testing with PhantomJS

For ClojureScript code that targets web browsers (as opposed to Node.js), it is often useful to run unit tests in the context of a web browser. This allows code that has side-effects (e.g. DOM manipulation) to be tested.

[PhantomJS] (http://www.phantomjs.org) is a headless Webkit-based browser with full JavaScript support. This means that it can do most anything you would expect a desktop browser to do, except it does not have a GUI. PhantomJS can be automated via JavaScript, and thus is convenient to use for running automated tests.

The [advanced example project] (https://github.com/emezeske/lein-cljsbuild/blob/0.2.6/example-projects/advanced) contains an example of how to use PhantomJS for running ClojureScript tests. There are several components that come together to make this work:

  1. A :builds entry dedicated to the test code in the test-cljs directory. This compiles the unit tests into JavaScript (so that it they can be run by PhantomJS).

  2. A [static HTML page] (https://github.com/emezeske/lein-cljsbuild/blob/0.2.6/example-projects/advanced/resources/private/html/unit-test.html) with a <script> tag that will pull in the compiled unit test code when the page is loaded.

  3. A :test-commands entry that runs PhantomJS, passing it [a simple script] (https://github.com/emezeske/lein-cljsbuild/blob/0.2.6/example-projects/advanced/phantom/unit-test.js) . This script directs PhantomJS to load the static HTML page, and once it's loaded, to call the ClojureScript unit test entry point.