Book Image

Mastering React Test-Driven Development - Second Edition

By : Daniel Irvine
Book Image

Mastering React Test-Driven Development - Second Edition

By: Daniel Irvine

Overview of this book

Test-driven development (TDD) is a programming workflow that helps you build your apps by specifying behavior as automated tests. The TDD workflow future-proofs apps so that they can be modified without fear of breaking existing functionality. Another benefit of TDD is that it helps software development teams communicate their intentions more clearly, by way of test specifications. This book teaches you how to apply TDD when building React apps. You’ll create a sample app using the same React libraries and tools that professional React developers use, such as Jest, React Router, Redux, Relay (GraphQL), Cucumber, and Puppeteer. The TDD workflow is supported by various testing techniques and patterns, which are useful even if you’re not following the TDD process. This book covers these techniques by walking you through the creation of a component test framework. You’ll learn automated testing theory which will help you work with any of the test libraries that are in standard usage today, such as React Testing Library. This second edition has been revised with a stronger focus on concise code examples and has been fully updated for React 18. By the end of this TDD book, you’ll be able to use React, Redux, and GraphQL to develop robust web apps.
Table of Contents (26 chapters)
Part 1 – Exploring the TDD Workflow
Part 2 – Building Application Features
Part 3 – Interactivity
Part 4 – Behavior-Driven Development with Cucumber

Sketching a mock-up

Let’s start with a little more up-front design. We’ve got an Appointment component that takes an appointment and displays it. We will build an AppointmentsDayView component around it that takes an array of appointment objects and displays them as a list. It will also display a single Appointment: the appointment that is currently selected. To select an appointment, the user simply clicks on the time of day that they’re interested in.

Figure 2.1 – A mock-up of our appointment system UI

Up-front design

When you’re using TDD to build new features, it’s important to do a little up-front design so that you have a general idea of the direction your implementation needs to take.

That’s all the design we need for now; let’s jump right in and build the new AppointmentsDayView component.