Testing with Jest: Comprehensive Guide
Table of Contents
- Introduction to Jest
- Installation and Setup
- Writing Your First Test
- Test Matchers
- Asynchronous Testing
- Testing React Components
- Snapshot Testing
- Mock Functions
- 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"
}
}