Jest For Selenium JavaScript Testing (With Examples)

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.

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

Bootstrap 5 Complete Course with Examples

Bootstrap 5 Tutorial - Bootstrap 5 Crash Course for Beginners

Nest.JS Tutorial for Beginners

Hello Vue 3: A First Look at Vue 3 and the Composition API

Building a simple Applications with Vue 3

Deno Crash Course: Explore Deno and Create a full REST API with Deno

How to Build a Real-time Chat App with Deno and WebSockets

Convert HTML to Markdown Online

HTML entity encoder decoder Online

Jest Tutorial for Beginners - JavaScript Testing with Jest Framework

In this Jest tutorial for beginners, you'll learn how to getting started with JavaScript unit testing with Jest framework. What means testing? How to test JavaScript code with Jest? Learn the basics of testing JavaScript with this Jest tutorial for beginners!

Where To Learn Test Programming — July 2020 Edition

What do you do when you have lots of free time on your hands? Why not learn test programming strategies and approaches?

Top 15 Free JavaScript Frameworks for Web Applications

List of some useful JavaScript Frameworks and libraries for website, web apps, and mobile apps development, that developers should know about to make selection easier.

Getting started with JavaScript unit testing with Jest Framework

How to Test Asynchronous Code with Jest. Welcome to this video on Jest Tutorial for Beginners. we will see how to Get Started With JavaScript unit testing with Jest framework.

How to Do API Testing?

API endpoint when you send the get request to that URL it returns the JSON response. In this article, I am going to use postman assertions for all the examples since it is the most popular tool. But this article is not intended only for the postman tool.