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

Creating a User Interface

The components we've built so far have been isolated: they don't fit together, and there's no sequence of events for the user. In this chapter, we'll tie all those components into a functioning system. Here's how we'll do it.

When the user navigates to the app, they will see a list of today's appointments using the AppointmentsDayView component. That appointment data will be loaded from the server. In addition to the list, the user will see a button labeled Add customer and appointment. Clicking that button makes the CustomerForm appear. When the form is filled out and the submit button is clicked, the user is then shown the AppointmentForm and can add a new appointment for that customer, as shown below:

The Appointments system showing the new button in the upper-left corner

Once they've added the appointment they...