JavaScript Unit Testing

ccnmtldjango includes everything necessary to write unit tests for the surrounding Django application. You can run the JavaScript tests like this:

make mocha

That will run each file in /media/js/tests/ that ends in .js, except for the test runner itself (test-runner.js).

Some JavaScript code isn’t essential to the functionality of a Django app. But if you have JavaScript that’s, for example, making an Ajax POST request to update a user attribute, it’s probably essential and should be tested.

This document only describes unit tests in JavaScript: testing the code independent of any surrounding pieces. For more all-encompassing testing, look at Behave, which uses Selenium.

Importing a RequireJS module for testing

Say you have an isEven function in /media/js/src/utils.js that returns true if the input is an even number. This is easily unit tested. Here’s how to test it from Mocha:

// in media/js/tests/utils-test.js

var assert = require('assert');
var requirejs = require('requirejs');

describe('utils', function() {
    // Load the utils module with requirejs
    var utils = requirejs('../src/utils');
    describe('isEven()', function() {
        it('should return true when given even numbers', function() {
            assert.equal(utils.isEven(2), true);
            assert.equal(utils.isEven(10), true);

        it('should return false when given odd numbers', function() {
            assert.equal(utils.isEven(1), false);
            assert.equal(utils.isEven(5), false);

Testing an Ajax interaction

You can test the JavaScript that makes an Ajax request independently of the Django server by using sinon.js.