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Clojars Project

cljs-test-display is a library that produces a visual display of an in-browser ClojureScript test run.


cljs-test-display is a ClojureScript library that you can use along with your web-based test runner to provide visual and system feedback for your test runs.

If you have tests written with cljs.test and you can run them in the browser you can use cljs-test-display.


  • Fully compatible with cljs.test

  • Small understandable codebase

  • Only a ClojureScript library, no server-side component

  • No dependencies

  • Red/green favicon feedback

  • Numbered stacktraces for test exceptions in the dev console

  • Hide/show passing tests with a key-press

  • System notifications for passing and failing test runs

  • Straightforward integration
;; where "app" is the HTML node where you want to mount the tests
  (cljs-test-display.core/init! "app") ;;<-- initialize cljs-test-display here


You will need to be familiar with how to create a ClojureScript application and run it in a browser.


You will need to add [com.bhauman/cljs-test-display "0.1.1"] to your project's dependencies along with a recent version of ClojureScript. It has been tested with [org.clojure/cojurescript 1.10.238] and above, but it should work with almost any version of ClojureScript that includes cljs.test.

Test runner integration

First, you will need to require cljs-test-display.core in your test runner, then call the cljs-test-display.core/init! function. init! returns a cljs.test environment much like cljs.test/empty-env initialized so that cljs-test-display is engaged.

Example: test/example/test_runner.cljs

(ns example.test-runner
(defn test-run []
  ;; where "app" is the HTML node where you want to mount the tests
    (cljs-test-display.core/init! "app") ;;<-- initialize cljs-test-display here

Providing init! the element id is optional: app is the default.

It is important to note that the cljs-test-display.core/init! function is designed to be called repeatedly in the same environment, to facilitate hot reloading and test re-runs.

For the best development experience, invoke your test runner after every hot reload.

HTML host file

The HTML that hosts the tests can be very simple.

Example resources/public/tests.html file:

  <!-- the head element is required as this is where we add CSS and favicon elements -->
    <div id="app"></div>
    <script src="[path to your compiled cljs]" type="text/javascript"></script>


You can configure cljs-test-display by adding keys to the :closure-defines key in your ClojureScript compiler options.

{:main example.core
 :output-to "main.js"
 :closure-defines {
    ;; set the element id of where the tests will mount
    cljs-test-display.core/root-node-id "test-app" ;; default "app"
    ;; disable the favicon changing behavior
    cljs-test-display.core/change-favicon false    ;; default true
    ;; disable the system notifications
    cljs-test-display.core/notifications  false    ;; default true
    ;; enable the printing of test results
    cljs-test-display.core/printing       true     ;; default false

Providing your own style

You can override the injected CSS by supplying your own CSS via an HTML tag with an id cljs-test-display-style.

For Example:

    <!-- override injected css -->
    <link id="cljs-test-display-style" type="text/css" href="css/my-css.css">
    ;; you can also place CSS here if you only wish to ammend the CSS
    <div id="app"></div>
    <script src="[path to your compiled cljs]" type="text/javascript"></script>


You should be able to work on cljs-test-display by forking/cloning this repo and then cding into the cljs-test-display directory and running.

clojure -A:build

This will auto-compile and send all changes to the browser without the need to reload. After the compilation process is complete, you will get a Browser Connected REPL. An easy way to try it is:

(js/alert "Am I connected?")

This should cause an alert to pop up in the browser window.

You will now be able to live edit the code in src/cljs-test-display/core.cljs and live edit the CSS in resources/public/com/bhauman/cljs-test-display/css/style.css.

To clean all compiled files:

rm -rf target/public


Copyright © 2018 Bruce Hauman

Distributed under the Eclipse Public License either version 1.0 or (at your option) any later version.