import userEvent from '@testing-library/user-event' test('form submission', async () => const user = userEvent.setup() render(<LoginForm />)
export default testEnvironment: 'jsdom', setupFilesAfterEnv: ['<rootDir>/src/setupTests.js'], transform: tsx)$': 'babel-jest', ,
// Use userEvent instead of fireEvent await user.click(button) React Testing Library and Jest- The Complete Guide
test('loads and displays user', async () => const mockUser = name: 'John Doe' fetch.mockResolvedValueOnce( json: async () => mockUser, )
act(() => jest.advanceTimersByTime(1000) ) async () =>
expect(await screen.findByText('Valid email required')).toBeInTheDocument() ) ✅ DO // Query by accessible name screen.getByRole('button', name: /submit/i ) // Use findBy for async elements expect(await screen.findByText('Loaded')).toBeInTheDocument()
test('toggles state on click', async () => const user = userEvent.setup() render(<Toggle />) const user = userEvent.setup() render(<
await user.click(button) expect(handleClick).toHaveBeenCalledTimes(1) ) Priority Order (get by accessibility first) | Query | Returns | When to use | |-------|---------|--------------| | getByRole | Element | Most preferred - accessible to screen readers | | getByLabelText | Input/textarea | Form fields with labels | | getByPlaceholderText | Input | Fallback when no label | | getByText | Element | Buttons, paragraphs, headings | | getByDisplayValue | Input | Current value of form field | | getByAltText | Image | Images with alt text | | getByTitle | Element | Title attribute | | getByTestId | Element | Last resort - avoid when possible | Query Variants // Single element (throws error if not found) screen.getByRole('button') // Multiple elements screen.getAllByRole('listitem')
import userEvent from '@testing-library/user-event' test('form submission', async () => const user = userEvent.setup() render(<LoginForm />)
export default testEnvironment: 'jsdom', setupFilesAfterEnv: ['<rootDir>/src/setupTests.js'], transform: tsx)$': 'babel-jest', ,
// Use userEvent instead of fireEvent await user.click(button)
test('loads and displays user', async () => const mockUser = name: 'John Doe' fetch.mockResolvedValueOnce( json: async () => mockUser, )
act(() => jest.advanceTimersByTime(1000) )
expect(await screen.findByText('Valid email required')).toBeInTheDocument() ) ✅ DO // Query by accessible name screen.getByRole('button', name: /submit/i ) // Use findBy for async elements expect(await screen.findByText('Loaded')).toBeInTheDocument()
test('toggles state on click', async () => const user = userEvent.setup() render(<Toggle />)
await user.click(button) expect(handleClick).toHaveBeenCalledTimes(1) ) Priority Order (get by accessibility first) | Query | Returns | When to use | |-------|---------|--------------| | getByRole | Element | Most preferred - accessible to screen readers | | getByLabelText | Input/textarea | Form fields with labels | | getByPlaceholderText | Input | Fallback when no label | | getByText | Element | Buttons, paragraphs, headings | | getByDisplayValue | Input | Current value of form field | | getByAltText | Image | Images with alt text | | getByTitle | Element | Title attribute | | getByTestId | Element | Last resort - avoid when possible | Query Variants // Single element (throws error if not found) screen.getByRole('button') // Multiple elements screen.getAllByRole('listitem')