React Native Testing Library
Simple and complete React Native testing utilities that encourage good testing practices.
We renamed the
react-native-testing-librarynpm package to
@testing-library/react-native, officially joining the "Testing Library" family 🎉. Read the migration guide.
You want to write maintainable tests for your React Native 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 React Native Testing Library (RNTL) is a lightweight solution for testing React Native components. It provides light utility functions on top of
react-test-renderer, in a way that encourages better testing practices. Its primary guiding principle is:
The more your tests resemble the way your software is used, the more confidence they can give you.
This project is inspired by React Testing Library. Tested to work with Jest, but it should work with other test runners as well.
Open a Terminal in your project's folder and run:
yarn add --dev @testing-library/react-native
npm install --save-dev @testing-library/react-native
This library has a peerDependencies listing for
react-test-renderer and, of course,
react. Make sure to install them too!
In order to properly use helpers for async tests (
waitFor) you need at least React >=16.9.0 (featuring async
act) or React Native >=0.60 (which comes with React >=16.9.0).
Additional Jest matchers
In order to use additional React Native-specific jest matchers from @testing-library/jest-native package add it to your project:
yarn add --dev @testing-library/jest-native
npm install --save-dev @testing-library/jest-native
Then automatically add it to your jest tests by using
setupFilesAfterEnv option in your Jest configuration (it's usually located either in
"jest" key or in a
Note for Flow users – you'll also need to install typings for
flow-typed install react-test-renderer
import render fireEvent from '@testing-library/react-native';import QuestionsBoard from '../QuestionsBoard';;
You can find the source of
QuestionsBoard component and this example here.
API / Usage
The public API of
@testing-library/react-native is focused around these essential methods:
render– deeply renders given React element and returns helpers to query the output components.
fireEvent- invokes named event handler on the element.
waitFor- waits for non-deterministic periods of time until queried element is added or times out.
waitForElementToBeRemoved- waits for non-deterministic periods of time until queried element is removed or times out.
within- creates a queries object scoped for given element.
Related External Resources
- Real world extensive examples repo
- Where and how to start testing 🧪 your react-native app ⚛️ and how to keep on testin’
- Intro to React Native Testing Library & Jest Native
Made with ❤️ at Callstack
React Native Testing Library is an open source project and will always remain free to use. If you think it's cool, please star it 🌟. Callstack is a group of React and React Native geeks, contact us at firstname.lastname@example.org if you need any help with these or just want to say hi!
Supported and used by Rally Health.