What is the purpose of the Assert class in unit testing?

Short answer: The Assert class provides methods to verify conditions in tests, such as equality, truth, exceptions, or null values. It determines whether a test passes or fails based on these validations.

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.