What are some popular testing frameworks for Node.js?

Short answer: Mocha: Flexible test runner, widely used. Jest: Full-featured, zero-config, includes mocks and coverage. Jasmine: Behavior-driven development framework. AVA: Minimalistic and fast. Tape: Simple and small footprint.

Real-world example (ShopNest)

A ShopNest BFF in Node.js aggregates catalog and price APIs for the React storefront.

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.