added a proper test for whether workspace object is cacheable
added a proper test for whether workspace object is cacheable

kbase/data_api,realmarcin/data_api,mlhenderson/data_api,kkellerlbl/data_api,kbase/data_api,kkellerlbl/data_api,mlhenderson/data_api,kkellerlbl/data_api,kbase/data_api,kbase/data_api,kkellerlbl/data_api,mlhenderson/data_api,mlhenderson/data_api,mlhenderson/data_api,kbase/data_api,kkellerlbl/data_api