Configuring headless unit testing with requirejs

Question

Configuring headless unit testing with requirejs

Seeking a JavaScript unit testing environment, I feel like I'm on a quest for the Holy Grail. The criteria are as follows:

testing Requirejs AMD modules
isolating each module by mocking out dependencies
ability to test in-browser during development
capability to test in a headless environment for continuous integration

Everything seems straightforward except for the aspect of headless mocking.

So far, I have experimented with JS-Test-Driver, Karma, and Phantomjs. For mocking purposes, I have utilized Squire and Isolate, along with an implementation from an answer here. Unfortunately, nothing seems to work quite right. The main issue that keeps cropping up is that the test framework completes before all tests have been run, mainly due to the mocks needing their own require() dependencies.

Any assistance or guidance would be greatly appreciated!

[edit]

I have created a simple, functional Karma project on Github with some example mocked tests, using chai-expect as the assertion library. I will strive to add more comprehensive documentation, but if you are familiar with Karma, extending it should be fairly easy. Simply git clone and then npm install to get started.

javascript unit-testing mocking requirejs

Answer 1

Answer №1

Most test frameworks allow for asynchronous testing and the manual initiation of tests, which is typically what you'll need.

Jasmine

In Jasmine, you can start tests manually by setting the autostart option to false:

Jasmine.config.autostart = false;

require(['test/jasmine/test.js'], function() {
    Jasmine.start();
});

If there are async tasks during testing, simply use Jasmine's stop() and start() functions:

it('something async', function() {
    stop();
    require(['something'], function(sth) {
        expect(sth).toBeTruthy();
        start();
    });
});

Jest

Jest follows a similar approach:

jest.setup('bdd');

require([ 'test/jest/test.js' ], function() {
    jest.run();
});

Asynchronous tests in Jest can be handled with callback parameters in your specs:

describe('an async task', function() {
    it('loads a dependency', function(done) {
        require(['something'], function(sth) {
            expect(sth).toBeTruthy();
            done();
        });
    });
});

This method should generally suffice. However, keep in mind that the order of tests may vary when loading files with RequireJS.

Answer 2

Most test frameworks allow for asynchronous testing and the manual initiation of tests, which is typically what you'll need.

Jasmine

In Jasmine, you can start tests manually by setting the autostart option to false:

Jasmine.config.autostart = false;

require(['test/jasmine/test.js'], function() {
    Jasmine.start();
});

If there are async tasks during testing, simply use Jasmine's stop() and start() functions:

it('something async', function() {
    stop();
    require(['something'], function(sth) {
        expect(sth).toBeTruthy();
        start();
    });
});

Jest

Jest follows a similar approach:

jest.setup('bdd');

require([ 'test/jest/test.js' ], function() {
    jest.run();
});

Asynchronous tests in Jest can be handled with callback parameters in your specs:

describe('an async task', function() {
    it('loads a dependency', function(done) {
        require(['something'], function(sth) {
            expect(sth).toBeTruthy();
            done();
        });
    });
});

This method should generally suffice. However, keep in mind that the order of tests may vary when loading files with RequireJS.

Configuring headless unit testing with requirejs

Answer №1

Jasmine

Jest

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