Example of mocking fetch in a test:?

Short answer: import { render, screen, waitFor } from '@testing-library/react'; import MyComponent from './MyComponent'; test('fetches and displays data', async () => { global.fetch = jest.fn(() => Promise.resolve({ json: () => Promise.resolve({ message: 'Data loaded' }), }) ); render(<MyComponent />); await waitFor(() => screen.getByText('Data loaded')); expect(screen.getByText('Data loaded')).toBeInTheDocument(); }); Here, we…

Explain a bit more

mock the fetch function to return mock data, then test whether it appears in the component.

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.