Làm thế nào để test custom hooks?

Dùng @testing-library/react với renderHook utility: const { result } = renderHook(() => useMyHook()); expect(result.current.value).toBe(expected).

• Để test interactions: act(() => { result.current.setValue('new') }).
• Với async hooks dùng waitFor. renderHook tạo component test wrapper để hooks có React context đầy đủ.

Use @testing-library/react with the renderHook utility: const { result } = renderHook(() => useMyHook()); expect(result.current.value).toBe(expected).

• To test interactions: act(() => { result.current.setValue('new') }).
• For async hooks use waitFor. renderHook creates a test component wrapper so hooks have full React context.