Unit Testing Interfaces with Moq

[joe11]

I'm new to Moq and unit testing. I have been doing a unit test and this is the following code:\[code\]private Mock<IServiceAdapter> repository; [TestInitialize] public void Initialize() { repository= new Mock<IServiceAdapter>(); }[TestMethod()] public void SaveTest() { //Setup string Name = "Name1"; string Type = "1"; string parentID = null; repository.Setup(x => x.Save(Name , Type, parentID)).Returns("Success").Verifiable(); //Do var result = repository.Object.Save(Name , Type, parentID); //Assert repository.Verify(); }\[/code\]My problem is that the test will always return the string that I put in the Returns parameter, in other words, it will always return "success" or whatever I write in its place. I guess thats not right because thats not the real behavior of the service. Anyone knows how I can mirror the real behavior of the "Save" service I'm trying to test? So lets say, if the return string is different from the service method,then the test should fail.