React Testing Library And Jest- The Complete Guide Page

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

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() React Testing Library and Jest- The Complete Guide

// Test const customRender = (ui, providerProps, ...renderOptions ) => return render( <ThemeProvider ...providerProps>ui</ThemeProvider>, renderOptions ) test('toggles state on click', async () =&gt; const

// Query (returns null if not found - no error) screen.queryByText('Missing text') test('toggles state on click'

await user.click(button) expect(button).toHaveTextContent('OFF') ) test('shows error for invalid email', async () => const user = userEvent.setup() render(<SignupForm />) await user.type(screen.getByLabelText(/email/i), 'invalid') await user.click(screen.getByRole('button', name: /submit/i ))

// Wait for the user name to appear expect(await screen.findByText('John Doe')).toBeInTheDocument()

act(() => jest.advanceTimersByTime(1000) )