Jest For Selenium JavaScript Testing (With Examples)

As a developer, I know for a fact that I have to constantly brush up myself with new updates. This means that not only I have to keep learning more about the frameworks and language I work with but also to look for new frameworks that gives me an edge over others. One such survey that I am always looking forward to as a developer is the ‘StateofJS’. It is revered by all the JavaScript developers as a key source of information. ‘StateofJS’ provides key insights on the major trends in front-end, back-end, testing, etc. As per StateofJS 2019, Jest has been the most interesting and satisfying framework for JavaScript testing.

Being a fan of Selenium test automation, I was curious to get my hands on Jest for Selenium JavaScript testing. I wanted to quickly validate my recent code changes and Jest was a big help in reducing my unit testing efforts.

In this Jest testing tutorial, I am going to help you execute Selenium JavaScript testing through the Jest framework. We will start off with basics to Jest, its advantages, and then we will hop over to the practical demonstration where we will execute our first Selenium test automation script for Jest and get our hands dirty on this framework.

What Is Jest?

Developed by Facebook, Jest is an open-source testing framework built on JavaScript, designed majorly for React and React Native based web applications.

We generally observe that unit tests for the frontend layer are not much suitable as it requires a lot more configuration to be done which can be complex at times. This complexity can be reduced to a great extent with the Jest framework.

Moreover, Jest can be used to validate almost everything around JavaScript, especially the browser rendering of your web-applications. Jest is a preferred framework for automated browser testing too and this makes it one of the most popular and renowned JavaScript testing libraries framework.

Jest also provides an excellent blended package of an assertion library along with a test runner and a built-in mocking library. The feature that makes it stand out is its simplicity and that is what makes it compatible to test any JavaScript Library Projects such as AngularJS, Vue JS, Node JS, Babel, and TypeScript.

Another great feature that it offers is snapshot testing, which basically helps us to get a test of the delta changes of the web-applications that are transformed after a particular time. Additionally, Jest also has built-in support for code coverage which can generate reports to figure out the areas or the part of the code that is not covered as a part of the test execution. Now that we’ve covered what is Jest in this Jest tutorial, let’s explore why you should use Jest for Selenium test automation.

Why Use Jest For Selenium JavaScript Testing?

In the world of Selenium JavaScript testing, there are many automated frameworks that are used for cross browser testing. So why Jest? Well, here are a few killer points that make Jest better than other test frameworks. Some of them are:

  • Speed and Performance — Jest framework is fast when it comes to executing the test cases. Not only it boosts up the entire test suite, but it also offers great efficiency in the watch mode that can be enabled in this framework.
  • Pre-commit hooks — Jest framework offers pre-commits hooks which are basically the ability to execute only those sets of test cases that are significant in the current run or the ones that are changed after the previous commit. That way, we don’t have to wait for the execution of all other test cases. These tests are popularly known as Snapshot testing & are useful in reducing the regressions testing efforts.
  • Complete Package — The framework comes with more or less all the required features. These built-in modules provide good support for plugins and there is no need to download any other third party executable like mocha or cucumber etc. to perform certain activities. In case, if we require to add any other library with the Jest framework, they are easily configurable, and we can choose which module to include so that there are no issues with compatibility.
  • Easy to Migrate — Any current test project can easily be migrated and switched to use the Jest framework programmatically without any issue or code interaction with the use of code mods module.
  • Added Features and Configurations — The framework is not just an ordinary and basic test runner but on the other hand it also offers some of the advanced features such as ability to auto mock modules, setup coverage thresholds, module mappers. This includes the support from multiple projects in the same runner and customer resolvers such as babel and webpack.

#testing #tutorial #javascript #framework #jest #programming

What is GEEK

Buddha Community

Jest For Selenium JavaScript Testing (With Examples)

Building A Test Runner in Jest - A How-To Guide

I use Jest nearly every day when working, and it’s a fantastic tool. It lets me ship my code with confidence, knowing that I have produced something which works as intended.

More often than not, when I write tests for my code, I end up catching something I hadn’t considered and go back to take that into account. It saves me from getting called in the evening to fix something in production. For me, that’s a big deal.

With that said, I didn’t really know how jest worked. I used it all the time, but had no real clue what was going on under the hood.

Recently, I bought Kent C Dodd’s excellent Testing JavaScript course which has been incredible for increasing my knowledge.

As part of that, he digs into how jest works under the hood, and this encouraged me to try building my own tiny version. So I want to pass on that knowledge to you!

This will be a small series of posts on each part, but you can skip ahead and see the full repo here.

Building our test runner

Today’s focus will be building the actual test runner. This simply accepts a test with a title, and a callback. We run the callback and if there are no errors, the test passes!

If an error is thrown, then we deem the test to have failed.

Take a look:

const test = async (title: string, callback: Function) => {
  try {
    await callback();
    console.log(`\u2713 ${title}`));
  } catch (error) {
    console.error(`✕ ${title}`));

So as you can see, we have our test function which accepts a title which is a string, and a callback which is the function which we want to test.

We then run our callback function in a try/catch block, and assuming that nothing is caught, we say the test has passed.

This allows us to run something like this:

test('sum adds numbers', () => {
  const sum = (a, b) => a + b
  const result = sum(3, 7)
  const expected = 10

So as you can see, we pass a title, and a function where we sum two numbers: 3 and 7. But on our final line, we see something new: expect and toBe. These are our assertions and we have nothing to handle them yet.

#jest #javascript #tdd #unit-testing #javascript-top-story #how-to-build-a-jest-clone #building-test-runner-in-jest #hackernoon-top-story

Skyla  Feeney

Skyla Feeney


Asynchronous JavaScript Testing with Selenium and Jest

Undoubtedly, selenium is the most used web application testing framework in the field of QA and especially in test automation projects. Since this framework supports many programming languages, quite a few test frameworks have entered our lives in automation projects and it is possible to meet new frameworks in the coming years either. However, I will not tell you about the newest framework. The Jest that I’m going to explain today is a testing framework that is maintained by Facebook that loves to use and known as well by many software developers who can write JavaScript. The survey for 2019 of confirms my definition.

Image for post

In this article, I will explain how to write test automation with selenium using the jest framework as asynchronously. So, what advantages can jest give us for writing test automation scripts?

  • Pretty fast,
  • Great documentation,
  • Asynchronous code testing support,
  • Setup and teardown,
  • Matchers

Let’s start if we are ready!


I assume you know how you started setting up your project with node.js. The dependencies we need are jest, selenium-webdriver, and chromedriver. You are able to add these dependencies to your project by the using below commands:

npm install --save-dev jest

npm install chromedriver
npm install selenium-webdriver

Except for these dependencies that are installed, we need to configure the jest either. First of all, in order to can be compiled the ES6 codes, you need to add the dependency below to your project using yarn

yarn add — dev babel-jest @babel/core @babel/preset-env

and add the related code by creating the babel.config.js file in your project.

// babel.config.js
module.exports = {
  presets: [['@babel/preset-env', {targets: {node: 'current'}}]],

For example, you are able to set the default timeout interval for tests and before/after hooks in milliseconds at jest.setup.js which you will add to your project.

import { jest } from "@jest/globals";
jest.setTimeout(10000); // 10 seconds

In order for the settings made in the jest.setup.js file to be configured, you should add the following code to the jest.config.js file which you created in your project.

module.exports = {
    setupFilesAfterEnv: ['./jest.setup.js'],

In order for jest to detect your test files, you should add the following regular expressions in jest.config.json .

  "testRegex": "(/__tests__/.*|(\\.|/)(test|spec))\\.jsx?$"

Edit the scripts block in the package.json file as follows to apply the settings in the jest.config.json file.

"scripts": {

"test": "jest --config ./jest.config.json"

#javascript #jest #selenium #testing #developer

Anthony  Dach

Anthony Dach


What's New in Selenium 4?

The newly released Selenium 4 is creating a lot of buzz and the complete testing community is looking forward to exploring its updated features.

Selenium has gone through a tremendous evolution since its introduction and that’s the reason today it is the most popular and powerful automation testing tool. The newly released Selenium 4 is creating a lot of buzz and the complete testing community is looking forward to exploring its updated features.

Before we dive into Selenium 4, let’s have a brief introduction to its previous versions. Selenium 1 was declared as the free open source automation testing framework in the year 2004 consisting of selenium IDE, RC, and web driver. Whereas, the Selenium 2 released in 2011 consisted of the IDE, Web driver, and Grid. The RC server was merged with the web driver, as the web driver facilitated easy automation scripting for the browsers. Selenium 3 was officially released in 2016. One of the most noticeable changes in selenium 3 was the replacement of the selenium core with the web driver-backed option, the introduction of the gecko driver, and W3C web driver integration.

With the aim of executing much seamless, accurate and faster test automation, Selenium 4 was released on 24th April 2019. So let’s unleash all the major features of selenium 4 which sets it apart from the earlier versions delivering better test automation. There are a lot of exciting features in Selenium 4 across the complete suite i.e. Selenium IDE, Webdriver and Grid. In Selenium 4 though the Webdriver captures the spotlight, we will cover the updated features of selenium IDE and selenium grid. So first of all let’s define the different user groups for the Selenium suite.

Selenium is a suite of tools that caters to the various requirements of the project such as:

  • Selenium IDE (Integrated Development Environment) Supports Rapid test development. This record/run tool helps in preparing test cases. Selenium IDE is an easy-to-use tool from the Selenium Test Suite which is used for developing automated test cases for web applications.
  • Selenium Webdriver provides flexible and seamless automation through a friendly and flexible API. It can perform automation in almost all programming languages.
  • The grid helps in providing automation testing by distributing and running the test cases in multiple machines simultaneously.

Let us explore the features of Selenium 4 across the different Selenium Tools.

#selenium #automation testing #selenium automation #selenium automated testing #selenium test automation #selenium 4

Anthony  Dach

Anthony Dach


6 Popular Challenges In Automation Testing using Selenium

Selenium is one of the most popular automated testing frameworks, with a market share of about 26.4% in the software testing tools category. This open-source testing framework enables you to automate user actions on your software application under test.

Using this free testing framework, you can also verify & validate your software products across multiple browsers. Additionally, you can create Selenium test scripts using various programming languages such as C#, Java, Python, etc.

The Selenium automation software consists of a host of software tools to cater to an organization’s different quality engineering needs. These are:

  1. Selenium IDE (Integrated Development Environment)
  2. Selenium RC (Remote Control)
  3. Selenium WebDriver
  4. Selenium Grid

Even though Selenium is among the most preferable web-app testing frameworks, it is not completely flawless. This automation framework has its fair share of challenges that developers face while working with it. Let us discuss some of the most common challenges and how you can tackle each of them.

#selenium #selenium-webdriver #selenium-automation-testing #test-automation #software-testing-tools #deployment-challenges #software-quality-assurance #software-testing

Aurelie  Block

Aurelie Block


Top 10 Automation Testing Tools: 2020 Edition

The demand for delivering quality software faster — or “Quality at Speed” — requires organizations to search for solutions in Agile, continuous integration (CI), and DevOps methodologies. Test automation is an essential part of these aspects. The latest World Quality Report 2018–2019 suggests that test automation is the biggest bottleneck to deliver “Quality at Speed,” as it is an enabler of successful Agile and DevOps adoption.

Test automation cannot be realized without good tools; as they determine how automation is performed and whether the benefits of automation can be delivered. Test automation tools is a crucial component in the DevOps toolchain. The current test automation trends have increased in applying artificial intelligence and machine learning (AI/ML) to offer advanced capabilities for test optimization, intelligent test generation, execution, and reporting. It will be worthwhile to understand which tools are best poised to take advantage of these trends.****

#automation-testing #automation-testing-tools #testing #testing-tools #selenium #open-source #test-automation #automated-testing