Simulation von Button-Klick-Ereignissen in Komponenten-Tests

import { render, fireEvent } from '@testing-library/react';
import React, { useState } from 'react';
 
function Counter() {
  const [val, setVal] = useState(0);
  return <button onClick={() => setVal(val + 1)}>Count: {val}</button>;
}
 
test('increments value on user click', () => {
  const { getByText } = render(<Counter />);
  const button = getByText('Count: 0');
  fireEvent.click(button);
  expect(button.textContent).toBe('Count: 1');
});