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ReactIntermediate#accessibility
ReactAdvanced#testing
How do you test React components?
Render with React Testing Library and assert on what the user sees, querying by role or label rather than implementation details, and use userEvent for interactions.
Example
render(<Login />);
await userEvent.type(screen.getByLabelText('Email'), 'a@b.com');
await userEvent.click(screen.getByRole('button', { name: /log in/i }));
expect(screen.getByText(/welcome/i)).toBeInTheDocument();