A set of helpers to sipmlify acceptance (e2e) testing using Chai, Mocha and Pupeteer. Can also be used for Unit testing. ;-)
Last updated a year ago by thomas_ochman .
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$ cnpm install e2e_training_wheels 
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For educational/training purposes only

End-To-End Testing Training Wheels

The E2E Testing Training Wheels serves 2 purposes. It provides a minimal test environment setup and a set of convenient helpers to be used in acceptance (end-2-end) tests. Can also be used for Unit testing.

It's highly opinionated meaning that most of the setup is done for you to allow you to focus on the development process, rather than the configuration of the test environment. This package has been created to be used in computer training sessions but can serve you well if you want an easy and hassle-free configuration.

The idea is to simplify the process of setting up a test environment with Mocha, Chai and Puppeteer. The package uses Superstatic as a local server. Note: Tested on OSX but will probably work on Linux

If you are starting out with testing your applications and would like to see a short introduction on how to set up End-To-End Testing Training Wheels in a project, take a look at this video.


In your npm project folder, run:

$ npm i e2e_training_wheels --save-dev



You can use a script to configure the environment or you can set it up manually.

Automatic setup

Once the package is installed, run the following script in your terminal:

$ node ./node_modules/e2e_training_wheels/dist/install.js

And run the following command in the terminal:

$ npm link

Manual setup

You need to add a file in the root folder that will load the necessary dependencies. Create a spec.helper.js file and add the following configuration:

const chai = require('chai');
const BrowserHelpers = require('e2e_training_wheels')
global.browser = new BrowserHelpers()
global.expect = chai.expect;

This setup requires your code to reside in a forder called src and your tests in two separate folders. We will have our acceptance tests in the features folder, and our unit tests in the spec folder. Note: you are free to change these folder names if you like, but you will have to modify the scripts.

Add the following scripts to package.json:

"scripts": {
    "test": "npm run features && npm run specs",
    "features": "superstatic src -p 8080 & mocha --timeout 100000 --recursive  --reporter=spec features ; PORT=8080 npm run stop-test-server ",
    "specs": "mocha --recursive  --reporter=spec spec",
    "server": "superstatic src -p 3000",
    "stop-test-server": "lsof -ti tcp:$PORT | xargs kill"
"bin": {
    "training-wheels:generate": "node ./node_modules/e2e_training_wheels/dist/generators.js",
    "training-wheels:install": "node ./node_modules/e2e_training_wheels/dist/install.js"

And run the following command in the terminal:

$ npm link

That will enable package specific commands you can use to scaffold various tests. Run training-wheels:generate --help to display all options.

Adding Unit specs

Create a spec folder in you project.

$ mkdir spec

Create a test file: $ touch sample.spec.js and use the following setup:


describe('Your test case description', () => {
    // Setup
    let array

    beforeEach(() => {
        // assign values to your variables
        array = new Array(2, 3)

    it('add a descriptive test title', () => {
        // Execute code if needed
        const sum = array[0] + array[1]
        // add an assertion using the `expect` keyword

    describe('nested describe block', () => {

      it('expect true to eq true', () => {


Adding Acceptance tests

Create a features folder in you project.

$ mkdir features

Create a test file: $ touch index.feature.js and use the following setup:


context('Your Description of the test scenario', () => {
  // Initialize a browser and visit the server's root path
  before(async () => {
    await browser.init()
    await browser.visitPage('http://localhost:8080/')

  // Reload before each test 
  beforeEach(async () => {
    await browser.page.reload();

  // Make sure the browser closes after the test is finished
  after(() => {

  it('/* description inserted here */', async () => {
    //  Write tour scenario  

  // Example test
  it('renders the correct page title', async () => {
    expect(await browser.page.title()).to.eql('Puppeteer Mocha Scaffold');

Running Tests

The command npm run features will start a local webserver, launch Chrome and run your acceptance tests.

The command npm run specs will run your unit tests.

If you execute npm test in your terminal, both your acceptance tests and unit tests will be run.

Available helpers

  • browser.getContent(element)
  • browser.fillIn(element, {with: string})
  • browser.clickOnButton(element)
  • browser.getElement(element)
  • browser.selectOption(element, {option: string})
  • browser.selectCheckBox(element)
  • browser.selectRadioButton(element)
  • browser.debugTheCode()


browser.fillIn(element, {with: string})

Allows you to fill in an input field with a value. Takes 2 arguments to identify the element and pass in the value to set.

Identifing an input field by id:

await browser.fillIn("input[id='the-id']", {with: "Whatever value"})

Identifing an input field by name:

await browser.fillIn("input[name='the-name']", {with: "Whatever value"})


Allows you to get the text value of an element.

Usage example:

let content = await browser.getContent("div[id='subscription-message']")
expect(content).to.contain('Thank you, your subscription has been confirmed!');


Allows you to click on a button or link.

Usage example:

await browser.clickOnButton("input[value='Subscribe']")

browser.selectOption(element, {option: string})

Allows you to select an option from a select tag

Usage example:

await browser.selectOption("select[name='subscription-type']", {option: 'yearly' })


Allows you to check a checkbox

Usage example:

await browser.selectCheckBox("input[id='subscribe']")


Allows you to select a radiobutton

Usage example:

await browser.selectRadioButton("input[id='radio-button']")


Set breakpoint in tests:

await browser.debugTheCode();

Set breakpoint in code:



We are using Chai matchers. The API reference is a great resource for more information.

Unit testing

This section is WIP

If you are planning on testing your Vanilla Javascript code (unit tests), there are a few gothchas to consider. Consider this example


function myFunction() {
  console.log('Hello World')

You have modify your code so it can be included in both the browser and Node.


function myFunction() {
  console.log('Hello World')

if (typeof module !== 'undefined' && module.exports) {
    module.exports = myFunction;

Then, in order to make it available in the E2E Testing Training Wheel configuration, you need to require this module in your spec.helper.js:


global.myFunction = require('./path/to/my_js_code')

This is the current setup. Please report any issues should you have problems with it.

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