How to Use Moq for Mocking Dependencies?

Short answer: How to Use Moq for Mocking Dependencies? Answer: Moq creates fake implementations of interfaces to control behavior during tests. Example: var mockRepo = new Mock<IProductRepository>(); mockRepo.Setup(x => x.GetAll()).Returns(new List<Product> { new Product { Id = 1, Name = "Laptop" } });

Example code

var service = new ProductService(mockRepo.Object);
var products = service.GetAll(); Assert.Single(products); ✅ Use .Setup(), .Verify(), and .Returns() to simulate behavior.

Real-world example (ShopNest)

ShopNest admin screens use MVC: controller loads data, Razor view renders HTML, Tag Helpers build forms safely.

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.