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

var mockRepo = new Mock<IProductRepository>();

Product { Id = 1, Name = "Laptop" } });
var service = new ProductService(mockRepo.Object);
var products = service.GetAll();