> We renamed the `react-native-testing-library` npm package to `@testing-library/react-native`, officially joining the "Testing Library" family 🎉. Read the [migration guide](https://callstack.github.io/react-native-testing-library/docs/migration-v7).
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:
This project is inspired by [React Testing Library](https://github.com/testing-library/react-testing-library). Tested to work with Jest, but it should work with other test runners as well.
> In order to properly use helpers for async tests (`findBy` queries and `waitFor`) you need at least React >=16.9.0 (featuring async `act`) or React Native >=0.60 (which comes with React >=16.9.0).
In order to use additional React Native-specific jest matchers from [@testing-library/jest-native](https://github.com/testing-library/jest-native) package add it to your project:
Then automatically add it to your jest tests by using `setupFilesAfterEnv` option in your Jest configuration (it's usually located either in `package.json` under `"jest"` key or in a `jest.config.js` file):
You can find the source of `QuestionsBoard` component and this example [here](https://github.com/callstack/react-native-testing-library/blob/master/src/__tests__/questionsBoard.test.js).
The [public API](https://callstack.github.io/react-native-testing-library/docs/api) of `@testing-library/react-native` is focused around these essential methods:
- [`render`](https://callstack.github.io/react-native-testing-library/docs/api#render) – deeply renders given React element and returns helpers to query the output components.
- [`fireEvent`](https://callstack.github.io/react-native-testing-library/docs/api#fireevent) - invokes named event handler on the element.
- [`waitFor`](https://callstack.github.io/react-native-testing-library/docs/api#waitfor) - waits for non-deterministic periods of time until queried element is added or times out.
- [`waitForElementToBeRemoved`](https://callstack.github.io/react-native-testing-library/docs/api#waitforelementtoberemoved) - waits for non-deterministic periods of time until queried element is removed or times out.
- [Real world extensive examples repo](https://github.com/vanGalilea/react-native-testing)
- [Where and how to start testing 🧪 your react-native app ⚛️ and how to keep on testin’](https://blog.usejournal.com/where-and-how-to-start-testing-your-react-native-app-%EF%B8%8F-and-how-to-keep-on-testin-ec3464fb9b41)
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](https://callstack.com) is a group of React and React Native geeks, contact us at [hello@callstack.com](mailto:hello@callstack.com) if you need any help with these or just want to say hi!
