How do you set up method expectations in Moq?

Short answer: mockService.Setup(s => s.GetData()).Returns("Mocked Data"); This configures the mock to return "Mocked Data" when GetData() is called.

Example code

mockService.Setup(s => s.GetData()).Returns("Mocked Data"); This configures the mock to return "Mocked Data" when GetData() is called.

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.