Can you describe a practical example where you used TDD?

Short answer: (Example) I wrote a simple calculator class using TDD: First, I wrote a test for addition, saw it fail, implemented Add() method, passed the test, then refactored. Repeated for subtraction, multiplication, etc., ensuring robust code with full test coverage.

Real-world example (ShopNest)

Arrange a cart with 2 items → Act Checkout() → Assert total and that payment was called once.

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.