Book Image

Getting Started with React

By : Doel Sengupta, Manu Singhal, Danillo Corvalan
Book Image

Getting Started with React

By: Doel Sengupta, Manu Singhal, Danillo Corvalan

Overview of this book

ReactJS, popularly known as the V (view) of the MVC architecture, was developed by the Facebook and Instagram developers. It follows a unidirectional data flow, virtual DOM, and DOM difference that are generously leveraged in order to increase the performance of the UI. Getting Started with React will help you implement the Reactive paradigm to build stateless and asynchronous apps with React. We will begin with an overview of ReactJS and its evolution over the years, followed by building a simple React component. We will then build the same react component with JSX syntax to demystify its usage. You will see how to configure the Facebook Graph API, get your likes list, and render it using React. Following this, we will break the UI into components and you’ll learn how to establish communication between them and respond to users input/events in order to have the UI reflect their state. You’ll also get to grips with the ES6 syntaxes. Moving ahead, we will delve into the FLUX and its architecture, which is used to build client-side web applications and complements React’s composable view components by utilizing a unidirectional data flow. Towards the end, you’ll find out how to make your components reusable, and test and deploy them into a production environment. Finally, we’ll briefly touch on other topics such as React on the server side, Redux and some advanced concepts.
Table of Contents (18 chapters)
Getting Started with React
About the Authors
About the Reviewers

Chapter 8. Testing React Components

Until now, we have explored React's components lifecycle, properties, state, validations, and ECMAScript with respect to React 0.1.13 and future versions. In this chapter, we will explore the testing of JavaScript and ReactJS-related stuffs. First, we will be going through the testing as a whole using different JavaScript test frameworks and how we can run the tests, followed by testing views build with the ReactJS library.

The following are the things we will be covering in this chapter:

  • Testing in JavaScript using Chai and Mocha

  • ReactTestUtils to test React components

  • Exploring Jest

  • Testing React-based app using Expect, Mocha, and Shallow rendering

There are various ways that you can mix and match while testing JavaScript. Let's have a brief overview of the various things such as frameworks, assertion libraries, and testing tools. The list given here is not an exhaustive one, and covering all of them in detail is beyond the scope of this book.

Mocha and Jasmine...