Testing with Jest: Comprehensive Guide

Table of Contents

1. Introduction to Jest
2. Installation and Setup
3. Writing Your First Test
4. Test Matchers
5. Asynchronous Testing
6. Testing React Components
7. Snapshot Testing
8. Mock Functions
9. Conclusion

1. Introduction to Jest

Jest is a powerful JavaScript testing framework developed by Facebook. It’s known for its “zero-configuration” philosophy and is designed to work seamlessly with most JavaScript projects and frameworks, including React. With Jest, you can write tests with an approachable, familiar, and feature-rich API that gives you results quickly.

2. Installation and Setup

Before getting started with Jest, you need to install it. We can setup Jest for our javascript applications by running the following command in your terminal as below

npm install --save-dev jest

Next, you will have to set up a test script in your package.json file:

{
  "scripts": {
    "test": "jest"
  }
}