OK this might be the most misleading error message I’ve seen. I cannot decide on how to describe it… What this means… or what this try to … Actually this happens when one of your mocked objects is mocking a method that returns something and your mocking doesn’t return anything. Eeeh - that was quite tricky.
Got it? Here is an example:
When I mock this method:
Public Class FacadeObject
Function CreateSomeThing(ByVal aName As String) As Long
End Function
End Class
by using the following code to do the mock
Expect.Once.On(m_mockadFacadeObject).Method("CreateSomeThing")
an exception of RemotingException (ByRef value type parameter cannot be null) will be thrown. Here is another description that you might find easier to understand