Book Image

Simplify Testing with React Testing Library

By : Scottie Crump
Book Image

Simplify Testing with React Testing Library

By: Scottie Crump

Overview of this book

React Testing Library (RTL) is a lightweight and easy-to-use tool for testing the document object model (DOM) output of components. This book will show you how to use this modern, user-friendly tool to test React components, reducing the risk that your application will not work as expected in production. The book demonstrates code snippets that will allow you to implement RTL easily, helping you to understand the guiding principles of the DOM Testing Library to write tests from the perspective of the user. You'll explore the advantages of testing components from the perspective of individuals who will actually use your components, and use test-driven development (TDD) to drive the process of writing tests. As you advance, you'll discover how to add RTL to React projects, test components using the Context API, and also learn how to write user interface (UI) end-to-end tests using the popular Cypress library. Throughout this book, you’ll work with practical examples and useful explanations to be able to confidently create tests that don't break when changes are made. By the end of this React book, you will have learned all you need to be able to test React components confidently.
Table of Contents (10 chapters)

Questions

  1. Install and configure the React-specific version of eslint-plugin-testing-library into a project and add additional rules.
  2. Create examples of jest assertions using matchers that don't use jest-dom best practices. Then, install and configure eslint-plugin-jest-dom inside a project and use it as a guide to correct highlighted issues.
  3. Create a few components with accessibility issues, install and run jest-axe against the components and use the feedback to fix them.
  4. Visit three of your favorite websites and use Testing Playground to see how many elements you can select using DOM Testing Library's preferred byRole* queries.
  5. Install Wallaby.js and log how quickly you can write a test using its in-editor features.