Until VB catches up with C# in the lambda support realm, here is how you can accomplish those Moq or Rhino.Mocks style verifications in VB: dim someSub as Action(Of double) = AddressOf mockObject.SomeSub Rhino.Mocks.Expect.Call( someSub) It’s very frustrating going from the full support in C# to VB, but I’m finding sufficient workaround for most items.  [...]