Render the component with React Native Testing Library, find the control by an accessible role or visible text, press it, and assert the user-visible result: render(<Counter />); fireEvent.press(getByRole('button', { name: /increment/i })); expect(getByText('Count: 1')).toBeTruthy(); Prefer getByRole or getByText over testID, and use waitFor or findBy queries for asynchronous updates. Test behavior rather than component implementation details.
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Render the component with React Native Testing Library, find the control by an accessible role or visible text, press it, and assert the user-visible result:
render(<Counter />);
fireEvent.press(getByRole('button', { name: /increment/i }));
expect(getByText('Count: 1')).toBeTruthy();
Prefer getByRole or getByText over testID, and use waitFor or findBy queries for asynchronous updates. Test behavior rather than component implementation details.