- Jest is a test library for JavaScript developed by Facebook.
- Create a test file using the .test.js extension. Implement your test cases inside the file. You can run the tests using the npm test command.
- For snapshot testing, you have to install the react-test-render package and import renderer to your test file. Implement your snapshot test cases inside the file and run the tests using the npm test command.
- Enzyme is a JavaScript library for testing the React component's output.
- Using the following npm command, npm install enzyme enzyme-adapter-react-16 --save-dev, we can install Enzyme.
- You have to import the Enzyme and Adapter components to your test file. Then, you can create your test cases to render a component. With Enzyme, you can use Jest for assertions. Enzyme provides the simulate method that can be used to test events.

Hands-On Full Stack Development with Spring Boot 2 and React
By :

Hands-On Full Stack Development with Spring Boot 2 and React
By:
Overview of this book
React Hooks have changed the way React components are coded. They enable you to write components in a more intuitive way without using classes, which makes your code easier to read and maintain. Building on from the previous edition, this book is updated with React Hooks and the latest changes introduced in create-react-app and Spring Boot 2.1.
This book starts with a brief introduction to Spring Boot. You’ll understand how to use dependency injection and work with the data access layer of Spring using Hibernate as the ORM tool. You’ll then learn how to build your own RESTful API endpoints for web applications. As you advance, the book introduces you to other Spring components, such as Spring Security to help you secure the backend. Moving on, you’ll explore React and its app development environment and components for building your frontend. Finally, you’ll create a Docker container for your application by implementing the best practices that underpin professional full stack web development.
By the end of this book, you’ll be equipped with all the knowledge you need to build modern full stack applications with Spring Boot for the backend and React for the frontend.
Table of Contents (22 chapters)
Preface
Section 1: Backend Programming with Spring Boot
Setting Up the Environment and Tools - Backend
Dependency Injection
Using JPA to Create and Access a Database
Creating a RESTful Web Service with Spring Boot
Securing and Testing Your Backend
Section 2: Frontend Programming with React
Setting Up the Environment and Tools - Frontend
Getting Started with React
Consuming the REST API with React
Useful Third-Party Components for React
Section 3: Full Stack Development
Setting Up the Frontend for Our Spring Boot RESTful Web Service
Adding CRUD Functionalities
Styling the Frontend with React Material-UI
Testing Your Frontend
Securing Your Application
Deploying Your Application
Best Practices
Assessments
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