How does continuous integration benefit from automated testing?

Short answer: Automated tests run on every code change, catching regressions early, ensuring consistent quality, enabling faster feedback, and supporting safer, more frequent releases.

Real-world example (ShopNest)

ShopNest unit tests cover pricing and discount rules so a bad coupon change fails in CI before customers see it.

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.