React Testing Library And Jest- The Complete Guide -

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

const button = screen.getByRole('button') expect(button).toHaveTextContent('OFF') React Testing Library and Jest- The Complete Guide

expect(screen.getByText('Done')).toBeInTheDocument() ) // Wait for the user name to appear expect(await screen

act(() => jest.advanceTimersByTime(1000) ) 'secret123') await user.click(screen.getByRole('button'

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')

await user.type(screen.getByLabelText(/email/i), 'user@example.com') await user.type(screen.getByLabelText(/password/i), 'secret123') await user.click(screen.getByRole('button', name: /submit/i ))

// Don't test props passed to children expect(ChildComponent).toHaveBeenCalledWith( prop: 'value' )