Book Image

Modern JavaScript Web Development Cookbook

By : Federico Kereki
Book Image

Modern JavaScript Web Development Cookbook

By: Federico Kereki

Overview of this book

JavaScript has evolved into a language that you can use on any platform. Modern JavaScript Web Development Cookbook is a perfect blend of solutions for traditional JavaScript development and modern areas that developers have lately been exploring with JavaScript. This comprehensive guide teaches you how to work with JavaScript on servers, browsers, mobile phones and desktops. You will start by exploring the new features of ES8. You will then move on to learning the use of ES8 on servers (with Node.js), with the objective of producing services and microservices and dealing with authentication and CORS. Once you get accustomed to ES8, you will learn to apply it to browsers using frameworks, such as React and Redux, which interact through Ajax with services. You will then understand the use of a modern framework to develop the UI. In addition to this, development for mobile devices with React Native will walk you through the benefits of creating native apps, both for Android and iOS. Finally, you’ll be able to apply your new-found knowledge of server-side and client-side tools to develop applications with Electron.
Table of Contents (15 chapters)

Writing unit tests with Jest

Doing unit testing for RN won't be too much of a surprise, because it happens that we'll be able to reuse most of what we learned before (for example, using Jest also with snapshots, or how to test Redux), except for some small details that must be taken care of, as we'll see.

In this recipe, we'll look at how to set up unit tests for RN, along the lines of what we already did for Node and React.

Getting ready

Whether you create the mobile app with CRAN (as we did) or with react-native init, support for Jest is baked in; otherwise, you'd have to install it on your own, as we saw in the Unit testing your code section of Chapter 5, Testing and Debugging Your Server. Depending...