LinkedListUnderflowException := Exception clone

LinkedList := Object clone do(
    add := method()
)

doFile("iospec.io")

context("An empty linked list",
        setup(
                linkedlist := LinkedList clone
        )

        specify("should accept an item when sent add",
                should not raise
                linkedlist add(Object clone)
        )

        specify("should complain when sent pop",
                should raise(LinkedListUnderflowException)
                linkedlist pop
        )
)