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 [Test Renderer](https://github.com/mdjastrzebski/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
npm install --save-dev @testing-library/react-native
```
This library has a `peerDependencies` listing for [Test Renderer](https://github.com/mdjastrzebski/test-renderer). Make sure to install it as a dev dependency:
```sh
npm install --save-dev test-renderer
```
### 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';
test('form submits two answers', async () => {
const questions = ['q1', 'q2'];
const onSubmit = jest.fn();
const user = userEvent.setup();
await render(