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

Making a choice from radio buttons

The Git tag for this section is time-slot-table.

It's time to apply what we've learn to a more complicated HTML setup. In this section, we'll test-drive a whole bunch of interconnected elements. To make things harder, we'll also be manipulating times and dates using the standard JavaScript Date object. As you'll soon see, our tests give us a structure to our work that makes even complicated scenarios straightforward.

We'd like to display available time slots over the next seven days as a grid, with columns representing days and rows representing 30-minute time slots, just like a standard calendar view. The user will be able to quickly find a time slot that works for them and then select the right radio button before submitting the form:

Here's an example of the HTML structure that we're aiming to build...