React Testing Library — a practical guide to React Testing Library with clear examples you can reuse in real projects.
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Short description
Avoid testing internal state; assert what users see and do.
RTL idea
render(<Login />);
await userEvent.type(screen.getByLabelText(/email/i), 'a@b.com');
await userEvent.click(screen.getByRole('button', { name: /sign in/i }));