React Advanced

React Advanced 2022

This workshop on React Native Testing Library covers various topics including testing components, user interaction events, mocking, and testing API calls. The speaker emphasizes the importance of testing the contract of a component and provides practical examples and exercises. Just module mocking is recommended as a portable solution for mocking modules. The workshop encourages exploring different testing strategies and provides additional resources for further learning.

Are you satisfied with your test suites? If you said no, you’re not alone—most developers aren’t. And testing in React Native is harder than on most platforms. How can you write JavaScript tests when the JS and native code are so intertwined? And what in the world are you supposed to do about that persistent act() warning? Faced with these challenges, some teams are never able to make any progress testing their React Native app, and others end up with tests that don’t seem to help and only take extra time to maintain. But it doesn’t have to be this way. React Native Testing Library (RNTL) is a great library for component testing, and with the right mental model you can use it to implement tests that are low-cost and high-value. In this three-hour workshop you’ll learn the tools, techniques, and principles you need to implement tests that will help you ship your React Native app with confidence. You’ll walk away with a clear vision for the goal of your component tests and with techniques that will help you address any obstacle that gets in the way of that goal.you will know:- The different kinds React Native tests, and where component tests fit in- A mental model for thinking about the inputs and outputs of the components you test- Options for selecting text, image, and native code elements to verify and interact with them- The value of mocks and why they shouldn’t be avoided- The challenges with asynchrony in RNTL tests and how to handle them- Options for handling native functions and components in your JavaScript tests Prerequisites:- Familiarity with building applications with React Native- Basic experience writing automated tests with Jest or another unit testing framework- You do not need any experience with React Native Testing Library- Machine setup: Node 16.x or 18.x, Yarn, be able to successfully create and run a new Expo app following the instructions on <a href="https://docs.expo.dev/get-started/create-a-new-app/">https://docs.expo.dev/get-started/create-a-new-app/</a>

Introduction to React Native Testing Library

Josh Justice

React Summit

React Summit 2022

Detox is a cross-platform framework for writing stable, end-to-end tests for React Native applications. It synchronizes with your application, waits for it to go idle, and prevents tests from failing due to ongoing processes or animations. Detox allows you to write unified tests that work for both iOS and Android, while still supporting platform-specific code. The workshop covers the installation and configuration of Detox, writing tests with Detox using measures, actions, and expectations, and debugging test failures. Test isolation and best practices are also emphasized.

Compared to unit testing, end-to-end testing aims to interact with your application just like a real user. And as we all know it can be pretty challenging. Especially when we talk about Mobile applications. Tests rely on many conditions and are considered to be slow and flaky. On the other hand - end-to-end tests can give the greatest confidence that your app is working. And if done right - can become an amazing tool for boosting developer velocity. Detox is a gray-box end-to-end testing framework for mobile apps. Developed by Wix to solve the problem of slowness and flakiness and <a href="https://github.com/facebook/react-native/blob/9a532edaaf6b80b10ce73eb8815e7f75a8c94bec/package.json#L155">used by React Native itself</a> as its E2E testing tool. Join me on this workshop to learn how to make your mobile end-to-end tests with Detox rock. Prerequisites- iOS/Android: MacOS Catalina or newer- Android only: Linux- <a href="https://github.com/evgeniyaglovatskaya/detox-workshop/blob/master/Workshop_Cheatsheets/0-START-PROJECT.md">Install before the workshop</a>

#react native test automation