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I'm trying to learn how to do Unit testing with C# and Moq, and I've built a little test situation. Given this code: public interface IUser { int CalculateAge(); DateTime DateOfBirth { get; set; } string Name { get; set; } } public class User : IUser { public DateTime DateOfBirth { get; set; } string Name { get; set; } public int CalculateAge() { return DateTime.Now.Year - DateOfBirth.Year; } } I want to test the method CalculateAge() . To do this, I thought I should try giving a default value to the DateOfBirth property by doing this in my test method: var userMock = new Mock<IUser>(); userMock.SetupProperty(u => u.DateOfBirth, new DateTime(1990, 3, 25)); //Is this supposed to give a default value for the property DateOfBirth ? Assert.AreEqual(22, userMock.Object.CalculateAge()); But when It comes to the assertion, the value of CalculateAge() equals 0, although DateOfBirth equals new DateTime(1990, 3, 25) . I know this may look like a silly example, but whatever... I thought I could use mocking to give values to not-yet-developed method/properties in my objects, so the testing of a method wouldn't depend on another component of my class, or even setting up a default context for my object (hence the name of the user here...) Am I approaching this problem the wrong way? Thanks.

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