Using @testing-library/react-native in react-native

First, lets get the necessary packages installed:

npm i @testing-library/react-native

or

yarn add @testing-library/react-native

This library can be viewed on npmjs.com at @testing-library/react-native

Here's a simple example of unit testing a React Native component using jest and react-native-testing-library:

import React from 'react';
import { render, fireEvent } from '@testing-library/react-native';
import MyComponent from './MyComponent';

describe('MyComponent', () => {
  it('renders correctly', () => {
    const { getByText } = render(<MyComponent />);
    expect(getByText('Hello World')).toBeTruthy();
  });

  it('handles button press', () => {
    const { getByText } = render(<MyComponent />);
    const button = getByText('Press Me');
    fireEvent.press(button);
    expect(getByText('Button Pressed')).toBeTruthy();
  });
});

In this example, MyComponent is being tested for correct rendering and button press handling. The render function from react-native-testing-library is used to render the component, and fireEvent.press is used to simulate a press event on the button. The getByText method is used to query elements in the component by their text content. The expect function is used to make assertions about the component's state.