Dim custMock As New Mock(Of Customer) custMock.Setup(Function(c) c.CheckCredit(1000)).Returns(True) For this code to work, though, the CheckCredit method in the real Customer object has to be marked ...

Ensure Consistent Testing with Mock Objects and Moq. If you run an automated test and your test fails then you want to know that it's your fault -- not a problem in someone else's code or the result ...