How do you test code with static methods?

Short answer: Refactor static methods into instance methods where possible for easier testing. Alternatively, wrap static calls in interfaces or use tools like Microsoft Fakes or JustMock that support static mocking.

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.