Book Image

Full Stack Development with Spring Boot 3 and React - Fourth Edition

By : Juha Hinkula
5 (1)
Book Image

Full Stack Development with Spring Boot 3 and React - Fourth Edition

5 (1)
By: Juha Hinkula

Overview of this book

If you’re an existing Java developer who wants to go full stack or pick up another frontend framework, this book is your concise introduction to React. In this three-part build-along, you’ll create a robust Spring Boot backend, a React frontend, and then deploy them together. This new edition is updated to Spring Boot 3 and includes expanded content on security and testing. For the first time ever, it also covers React development with the in-demand TypeScript. You’ll explore the elements that go into creating a REST API and testing, securing, and deploying your applications. You’ll learn about custom Hooks, third-party components, and MUI. By the end of this book, you'll be able to build a full stack application using the latest tools and modern best practices.
Table of Contents (23 chapters)
1
Part I: Backend Programming with Spring Boot
8
Part II: Frontend Programming with React
14
Part III: Full Stack Development
21
Other Books You May Enjoy
22
Index

Using Jest

Jest is a testing framework for JavaScript, developed by Meta Inc. (https://jestjs.io/). It is widely used with React and provides lots of useful features for testing. For example, you can create a snapshot test, whereby you can take snapshots from React trees and investigate how states are changing. Jest has mocking functionalities that you can use to test, for example, your asynchronous REST API calls. It also provides functions that are required for assertions in your test cases.

To demonstrate the syntax, we will see how to create a test case for a basic TypeScript function that performs some simple calculations. The following function takes two numbers as arguments and returns the product of the numbers:

// multi.ts
export const calcMulti = (x: number, y: number): number => {
  return x * y;
}

The following code snippet shows a Jest test for the preceding function:

// multi.test.ts
import { calcMulti } from './multi';
test("2 * 3...