Add spec showing in parameter passed to fake interface cannot be mutated
Add spec showing in parameter passed to fake interface cannot be mutated


blairconrad/FakeItEasy,thomaslevesque/FakeItEasy,adamralph/FakeItEasy,FakeItEasy/FakeItEasy,adamralph/FakeItEasy,thomaslevesque/FakeItEasy,blairconrad/FakeItEasy,FakeItEasy/FakeItEasy