Automated Testing with Jest and React Testing Library

Unit Tests

import { render, screen } from '@testing-library/react';
import userEvent from '@testing-library/user-event';
import Button from './Button';

test('button click calls handler', async () => {
  const handleClick = jest.fn();
  render(Click me);
  
  await userEvent.click(screen.getByText('Click me'));
  expect(handleClick).toHaveBeenCalledTimes(1);
});

Integration Tests

Test component interactions and data flow.