Added a test to the AbstractCacheTest which verifies the behavior of the Cache object when no key is set.
Added a test to the AbstractCacheTest which verifies the behavior of the Cache object when no key is set.

bankiru/Stash,localheinz/Stash,graphis/Stash,andrerom/Stash,tedious/Stash,jaredtking/Stash,jaredtking/Stash,theUniC/Stash,alawnchen/Stash,csburton/Stash,localheinz/Stash,graphis/Stash,theUniC/Stash,csburton/Stash,alawnchen/Stash,AndrewCarterUK/Stash,tedious/Stash,bankiru/Stash,AndrewCarterUK/Stash,andrerom/Stash