React testing library

We all know the love of developers for the most popular library If you are a frontend developer working on the React library, you might have some favorite tool or framework for testing your React application. A lot of developers use Jest, Enzyme, or some other popular tools and libraries to test the components of React application. However, every tool or framework is not the same for everyone. There are tons of testing frameworks and tools available in the open-source ecosystem for testing purpose of React application. Whether you’re doing unit testing, integration testing, or end to end testing, choosing the right toolset and framework for testing is the key factor in leveraging TDD in React. In this blog let’s talk about some popular React testing frameworks and libraries which a lot of people use in their day to day job. 1. Jest is the most popular testing framework with more than 16M downloads a week. It is created and maintained by Facebook. The team uses it to test all the JavaScript codes including React applications. It is also adopted by Airbnb, Uber, Intuit, and other teams as well. Jest comes with its test runner and assertion functions. This framework is also good for beginners who want to try incredibly fast JavaScript codes. • Very fast performance. Airbnb saw a decrease in the total test runtime from 12 minutes to only 4.5 minutes when they switched from Mocha to Jest. • It conduct snapshot, parallelization, and async method tests. • Mock your functions, inc...

Table of Contents • • • • • • • • • • • • • 🐛 Bugs • 💡 Feature Requests • ❓ Questions • • The problem You want to write maintainable tests for your React components. As a part of this goal, you want your tests to avoid including implementation details of your components and rather focus on making your tests give you the confidence for which they are intended. As part of this, you want your testbase to be maintainable in the long run so refactors of your components (changes to implementation but not functionality) don't break your tests and slow you and your team down. The solution The React Testing Library is a very lightweight solution for testing React components. It provides light utility functions on top of react-dom and react-dom/test-utils, in a way that encourages better testing practices. Its primary guiding principle is: Installation This module is distributed via devDependencies: npm install --save-dev @testing-library/react or for installation via yarn add --dev @testing-library/react This library has peerDependencies listings for react and react-dom. React Testing Library versions 13+ require React v18. If your project uses an older version of React, be sure to install version 12: npm install --save-dev @testing-library/react@12 yarn add --dev @testing-library/react@12 You may also be interested in installing @testing-library/jest-dom so you can use Docs Suppressing unnecessary warnings on React DOM 16.8 There is a known compatibility issue with React DOM 16.8 ...

1 How to create a React app without using create-react-app | a step by step guide 2 Set up ESLint, Prettier and Husky in a React project | a step by step guide 3 Setup Jest and React Testing Library in a React project | a step-by-step guide 4 Setup Tailwind CSS in a React project configured from scratch with Webpack | a step-by-step guide Not long ago that I came across with the concept of testing specifically "writing tests". I used to test everything by opening browsers and doing everything manually but you can't know what can go wrong when you change something in your code, and usually it does. The point is that real apps need testing to ensure that our features will not break unexpectedly, instead of testing the app yourself you write tests that you can run anytime to ensure that everything still works as expected. In this tutorial I will walk you through the process of setting up Jest and React testing library (RTL) for testing React applications Note: this is a third article in the series of setting up a React environment from scratch without create-react-app as Jest and React Testing Library are already included in CRA. in the first article, we created a brand new React project from scratch without using create-react-app, the second article we configured ESLint, Prettier and Husky and we will base on this progress to setup a Jest and RTL and write our first test. You can find code from last article Prerequisites • I will assume that you have a react app running and ...

Learn from Dr. Gleb Bahmutov, Senior Director of Engineering, Mercari, USA, on how to supercharge your end-to-end, component, and API Cypress tests using plugins. He will also showcase his favorite Cypress plugins, explain how they work, and how easy it is to write simple, elegant testing code, Save your Spot! Attend Live Q&A on 21 June. React is one of the most popular JavaScript libraries in use today. With its declarative style and emphasis on composition, React has transformed how we build modern web applications. However, as your application grows in size and complexity, you will want to write tests to avoid any future bugs. Moreover, building large-scale applications with React requires careful planning and organization to avoid some common pitfalls. Although testing React applications is not as straightforward as other libraries or frameworks, it’s possible. In this article on Let’s get started! TABLE OF CONTENTS • • • • • • • An Introduction to React React is an open-source declarative and flexible JavaScript library, developed and released by Meta (formerly known as Facebook). React is otherwise called React.js or ReactJS among the tech community. It is mainly used for building applications’ user interfaces. React is currently maintained by developers/engineers at Meta and contributors from other companies and the open-source community. The React library can be utilized as a base for creating Single page applications and mobile apps. The React library was original...

The author selected Obtaining solid test coverage is imperative for building confidence in your web application. In this tutorial, you will test asynchronous code and interactions in a sample project containing various UI elements. You will use Jest to write and run unit tests, and you will implement React Testing Library as a helper DOM ( To complete this tutorial, you will need: • Installing Using a PPA section of • npm version 5.2 or greater on your local machine, which you will need to use npx in the sample project. If you did not install npm alongside Node.js, do that now. For Linux, use the command sudo apt install npm. • For npm packages to work in this tutorial, install the build-essential package. For Linux, use the command sudo apt install build-essential. • Git installed on your local machine. You can check if Git is installed on your computer or go through the installation process for your operating system with • Familiarity with React, which you can develop with the • Some familiarity with In this step, you will clone a sample project and launch the test suite. The sample project utilizes three main tools: Create React App, Jest, and React Testing Library. Create React App is used to bootstrap a single-page React application. Jest is used as the test runner, and React Testing Library provides test helpers for structuring tests around user interactions. To begin, you will clone a pre-built React App from GitHub. You will work with the To clone the project from ...

Follow JavaScript developer. Wannabe designer and Chief Procrastinator at Selar.co and React end-to-end testing with Jest and Puppeteer September 20, 2022 10 min read 3026 Editor’s note: This tutorial was last updated and validated for accuracy on 20 September 2022. Testing is a crucial factor in ensuring that your application works as expected. In React applications, there are three common approaches to testing: • Unit testing : Checks that • Integration testing: Individual units or features of the app are combined and tested as a group • End-to-end testing (E2E) : Confirms that the entire range of features works from the user’s perspective End-to-end tests simulate actual user actions and are designed to test how a real user would likely use the application. In React, E2E testing helps to ensure that the code you wrote is functional and your app works as intended, allowing you to catch bugs in your code before your app is live. While there are • • • • • • • • • • page.emulate • What is Jest? Jest is a Designed with simplicity in mind, Jest offers a powerful and elegant API for building isolated tests, snapshot comparison, mocking, test coverage, and much more. What is Puppeteer? Puppeteer is a Node.js library that provides a high-level API to control With Puppeteer, you can scrape websites, generate screenshots and PDFs of pages, automate your form submissions, test your UI, access webpages and additional information using the DOM API, automate performance analysis, act ...