How do you test async behavior in React components?

Short answer: wait waitFor(() => screen.getByText('Loaded Data')); expect(screen.getByText('Loaded Data')).toBeInTheDocument(); }); In this case, waitFor() waits until the expected element appears in the DOM after an sync operation completes.

Explain a bit more

wait waitFor(() => screen.getByText('Loaded Data')); expect(screen.getByText('Loaded Data')).toBeInTheDocument(); }); In this case, waitFor() waits until the expected element appears in the DOM after an sync operation completes. wait waitFor(() => screen.getByText('Loaded Data')); expect(screen.getByText('Loaded Data')).toBeInTheDocument(); }); In this case, waitFor() waits until the expected element appears in the DOM after an sync operation completes.

Real-world example (ShopNest)

ShopNest’s storefront is React: components for ProductCard, CartDrawer, and CheckoutForm, with hooks for local UI state.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.