Add test of Object>>become:
Add test of Object>>become:

A swapping become should preserve identity.

jgfoster/Dolphin,dolphinsmalltalk/Dolphin,dolphinsmalltalk/Dolphin,shoshanatech/Dolphin,shoshanatech/Dolphin,jgfoster/Dolphin,jgfoster/Dolphin,objectarts/Dolphin,shoshanatech/Dolphin,objectarts/Dolphin,dolphinsmalltalk/Dolphin,jgfoster/Dolphin,dolphinsmalltalk/Dolphin,shoshanatech/Dolphin