Testing in React
Introduction to Testing React with Jest

This module looks at testing in React. You’ll learn how to set up a test environment, Jest, and other useful tools to test your React App.   

Learning Objectives 

The objectives of this module are to provide you with an understanding of: 

  • How to set up the test environment  
  • Jest  
  • Snapshot testing  
  • How to test with Props  
  • How to mock components for testing  
  • Mock functions  
  • How to test components asynchronously  
  • How to test components with routing  
  • How to test custom hooks 

Intended Audience  

This learning path is aimed at all who wish to learn how to use the ReactJS framework.  


It is essential you understand the face of contemporary web development to attend this course. We insist upon JavaScript experience, along with good HTML and CSS skills. 


We welcome all feedback and suggestions - please contact us at to let us know what you think. 


- [Instructor] Testing is an important part of any applications development. Understanding the testing tools for react is therefore an important part of the skillset. We'll look at the testing tools that are built into a project set up using create-react-app. Including the Facebook Jest testing library, and some other packages that can be used to help us test. We want to be able to unitise components, gaining an understanding of what to test and how we can test it. Including snapshots, dumb testing, and event testing. To do this, we'll examine how our Jest test file is structured and the building blocks we're using including suites specs, set up and tire down. To be able to make appropriate essention in tests we'll look at the in-built matches. For testing functionality, we'll examine mocking and spying on functions and for unitisation we'll visit mocking components. Test reporting is also known important aspect. So we'll demonstrate how code coverage reports can be generated and viewed. As we're focusing on testing react, we won't be looking into any integration or end to end testing as this really doesn't concern the react code we write. We'll also points out what you should and shouldn't test and why.


How to set up the Test Environment - Jest - The What and How of Testing in React - Snapshot Testing - Testing Components with Props - Mocking Components for Testing - Testing State Events Interactions - Mocking Functions - Testing Components Asynchronously - Testing Components with Routing - Testing Custom Hooks  

About the Author
Learning Paths

Ed is an Outstanding Trainer in Software Development, with a passion for technology and its uses and holding more than 10 years’ experience.

Previous roles have included being a Delivery Manager, Trainer, ICT teacher, and Head of Department. Ed continues to develop existing and new courses, primarily in web design using: PHP, JavaScript, HTML, CSS, SQL, and OOP (Java), Programming Foundations (Python), and DevOps (Git, CI/CD, etc). Ed describes himself as practically minded, a quick learner, and a problem solver who pays great attention to detail. 

Ed’s specialist area is training in Emerging Technologies, within Web Development. Ed mainly delivers courses in JavaScript covering vanilla JS, ES2015+, TypeScript, Angular, and React (the latter is authored by Ed) and has delivered on behalf of Google for PWAs. Ed has also developed a new suite of PHP courses and has extensive experience with HTML/CSS and MySQL. 

Ed is responsible for delivering QA’s Programming Foundations course using the Eclipse IDE. His skillset extends into the DevOps sphere, where he is able to deliver courses based around Agile/Scrum practices, version control, and CI/CD.

Covered Topics