Book Image

Mastering React Test-Driven Development

By : Daniel Irvine
Book Image

Mastering React Test-Driven Development

By: Daniel Irvine

Overview of this book

Many programmers are aware of TDD but struggle to apply it beyond basic examples. This book teaches how to build complex, real-world applications using Test-Driven Development (TDD). It takes a first principles approach to the TDD process using plain Jest and includes test-driving the integration of libraries including React Router, Redux, and Relay (GraphQL). Readers will practice systematic refactoring while building out their own test framework, gaining a deep understanding of TDD tools and techniques. They will learn how to test-drive features such as client- and server-side form validation, data filtering and searching, navigation and user workflow, undo/redo, animation, LocalStorage access, WebSocket communication, and querying GraphQL endpoints. The book covers refactoring codebases to use the React Router and Redux libraries. via TDD. Redux is explored in depth, with reducers, middleware, sagas, and connected React components. The book also covers acceptance testing using Cucumber and Puppeteer. The book is fully up to date with React 16.9 and has in-depth coverage of hooks and the ‘act’ test helper.
Table of Contents (21 chapters)
Free Chapter
1
Section 1: First Principles of TDD
6
Section 2: Building a Single-Page Application
12
Section 3: Interactivity
16
Section 4: Acceptance Testing with BDD

Installing Relay

The Git tag for this section is relay-environment. It contains solutions to the exercises from the previous chapter, so if you haven't completed the Exercises section yourself, then you should move to this tag now so that you're up to date.

For more detailed instructions, see the To get the most out of this book section in the Preface.

There are three parts to Relay that we'll need to install. Type the following at the command line:

npm install --save react-relay
npm install --save-dev babel-plugin-relay relay-compiler

You'll also need to update your .babelrc file to include the Babel plugin:

{
"presets": ["@babel/env", "@babel/react"],
"plugins": ["@babel/transform-runtime", "relay"]
}

Once you've done that, you're good to go.

The server you've been using already has...