What is snapshot testing?

Short answer: Snapshot testing is a way of testing a component’s rendered output by saving it to a snapshot file and comparing it with future renders. This helps detect any unintended changes in the UI. How to write snapshot tests: Run Jest with snapshot testing: npm test -- --updateSnapshot

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.