Developer-friendly and complete React Native testing utilities that encourage good testing practices.
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## The problem
You want to write maintainable tests for your React Native components. Your tests should avoid implementation details and focus on giving you confidence. They should remain maintainable so refactors (changes to implementation but not functionality) don't break your tests and slow you and your team down.
## This solution
The React Native Testing Library (RNTL) tests React Native components. It simulates the React Native runtime on top of `react-test-renderer` and 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](https://github.com/testing-library/react-testing-library). Tested to work with Jest, but it should work with other test runners as well.
## Installation
Open a Terminal in your project's folder and run:
```sh
# Yarn install:
yarn add --dev @testing-library/react-native
# NPM install
npm install --save-dev @testing-library/react-native
```
This library has a `peerDependencies` listing for `react-test-renderer`. Make sure that your `react-test-renderer` version matches exactly the `react` version, avoid using `^` in version number.
### Additional Jest matchers
You can use the built-in Jest matchers automatically by having any import from `@testing-library/react-native` in your test.
## Example
```jsx
import { render, screen, userEvent } from '@testing-library/react-native';
import { QuestionsBoard } from '../QuestionsBoard';
// Use userEvent with fake timers
// Some events involve duration, so tests may take a long time to run.
jest.useFakeTimers();
test('form submits two answers', async () => {
const questions = ['q1', 'q2'];
const onSubmit = jest.fn();
const user = userEvent.setup();
render(