Use Claude to Generate React Testing Library Tests

Writing good React Testing Library tests means knowing which queries to use, how to handle async state updates, and how to mock modules without testing implementation details. Claude follows RTL best practices and can generate a full test suite from your component.

Write React Testing Library tests for this component. Cover:
- Initial render with default props
- The form submission flow including loading and success states
- The error state when the API call fails
- Accessibility — ensure all interactive elements are reachable by role

[paste your component here]

Claude will use screen.getByRole over getByTestId, wrap async interactions in userEvent rather than fireEvent, and apply waitFor correctly for async assertions. It'll suggest mocking patterns using vi.mock (Vitest) or jest.mock and show you how to set up msw handlers if your component fetches data.

it('shows an error message when the API call fails', async () => {
  server.use(http.post('/api/contact', () => HttpResponse.error()));
  render(<ContactForm />);
  await userEvent.click(screen.getByRole('button', { name: /submit/i }));
  expect(await screen.findByRole('alert')).toHaveTextContent(/something went wrong/i);
});

Ask it to "add tests for the custom useDebounce hook" or "write a test that verifies keyboard navigation works" to push coverage further.

Claude knows the RTL philosophy — query by role, test behaviour not implementation — and applies it consistently across every test it writes.