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Consider this class: public class Content { public virtual bool IsCheckedOut {get; private set;} public virtual void CheckOut() { IsCheckedOut = true; } public virtual void CheckIn() { //Do Nothing for now as demonstrating false positive test. } } The Checkin method is intentionally empty. Now i have a few test methods to verify the status of calling each method. [TestMethod] public void CheckOutSetsCheckedOutStatusToTrue() { Content c = new Content(); c.CheckOut(); Assert.AreEqual(true, c.IsCheckedOut); //Test works as expected } [TestMethod] public void CheckInSetsCheckedOutStatusToFalse() { Content c = new Content(); c.CheckIn(); Assert.AreEqual(false, c.IsCheckedOut); //Test does not work as expected } The 2nd test passes for the wrong reasons. So how can i use mocking (moq) to verify that CheckIn is setting the IsCheckedOut property? Thanks. EDIT To clarify: I have a method called CheckIn() whose job it is to set the IsCheckedOut status to false. You will see in my test code above that the Test will return false even if i do not set the property value to false; This is expected, nothing wrong here. I think my question specifically is How can i verify that the CheckIn() method has set the IsCheckedOut property to false? This is what I would call behavioral verification. I believe some of the comments suggested doing something which amounts to state verification? If so I don't believe there is any value in mocking this part at all when we can simply use: Content c = new Content(); c.CheckIn(); Assert.AreEqual(false, c.IsCheckedOut); //State verification Of course I may be wrong, so please help me clarify these concepts :)

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