Book Image

React Design Patterns and Best Practices

By : Michele Bertoli
Book Image

React Design Patterns and Best Practices

By: Michele Bertoli

Overview of this book

Taking a complete journey through the most valuable design patterns in React, this book demonstrates how to apply design patterns and best practices in real-life situations, whether that’s for new or already existing projects. It will help you to make your applications more flexible, perform better, and easier to maintain – giving your workflow a huge boost when it comes to speed without reducing quality. We’ll begin by understanding the internals of React before gradually moving on to writing clean and maintainable code. We’ll build components that are reusable across the application, structure applications, and create forms that actually work. Then we’ll style React components and optimize them to make applications faster and more responsive. Finally, we’ll write tests effectively and you’ll learn how to contribute to React and its ecosystem. By the end of the book, you’ll be saved from a lot of trial and error and developmental headaches, and you will be on the road to becoming a React expert.
Table of Contents (19 chapters)
React Design Patterns and Best Practices
About the Author
About the Reviewer
Customer Feedback

Painless JavaScript testing with Jest

The most important way to learn how to test React components in the right way is by writing some code, and that is what we are going to do in this section.

The React documentation says that at Facebook they use Jest to test their components. However, React does not force you to use a particular test framework and you can use your favorite one without any problems.

In the next section, you will learn how  it's possible to test components using Mocha.

To see Jest in action we are going to create a project from scratch, installing all the dependencies and writing a component with some tests. It'll be fun!

The first thing to do is to move into a new folder and run:

npm init

Once the package.json is created we can start installing the dependencies, with the first one being the jest package itself:

npm install --save-dev jest

To tell npm that we want to use the jest command to run the tests, we have to add the following scripts to the package.json:

"scripts": ...