AlbumPanelSpec

Panel

• notifies presentation model when save button is clicked

ContractEnforcementSampleSpec

Domain object

• is cloneable
• has consistent equals and hash code
• has consistent equals and compare to
• is serializable

ObservableSpec

Observable having observer

• calls on action when significant event happens

StackSpec

Empty stack

• is no longer empty after push
• is empty

Full stack

• is full
• complains on push
• contains all items
• does not contain removed item
• contains all but removed item

Stack which is neither empty nor full

• adds to the top when sent push