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import userEvent from '@testing-library/user-event' test('form submission', async () => const user = userEvent.setup() render(<LoginForm />)

import '@testing-library/jest-dom/vitest' // or 'jest-dom' Component to test ( Button.jsx ) export const Button = ( onClick, children, disabled = false ) => ( <button onClick=onClick disabled=disabled> children </button> ) Test file ( Button.test.jsx ) import render, screen from '@testing-library/react' import userEvent from '@testing-library/user-event' import Button from './Button' test('renders button with children and handles click', async () => const handleClick = jest.fn() const user = userEvent.setup()

// Async (for elements that appear later) await screen.findByText('Loaded')

test('toggles state on click', async () => const user = userEvent.setup() render(<Toggle />)

test('loads and displays user', async () => const mockUser = name: 'John Doe' fetch.mockResolvedValueOnce( json: async () => mockUser, )

// Test const customRender = (ui, providerProps, ...renderOptions ) => return render( <ThemeProvider ...providerProps>ui</ThemeProvider>, renderOptions )