Added test case for object subscripting
Added test case for object subscripting

gauravds/UICKeyChainStore,v2dev/UICKeyChainStore,hanhailong/UICKeyChainStore,TomoakiNagahara/UICKeyChainStore,kishikawakatsumi/UICKeyChainStore,Kingside/UICKeyChainStore,dezinezync/UICKeyChainStore,imjerrybao/UICKeyChainStore,Ninikitos/UICKeyChainStore,HSFGitHub/UICKeyChainStore,bigrpg/UICKeyChainStore,dleehr/UICKeyChainStore,kishikawakatsumi/UICKeyChainStore,hulu001/UICKeyChainStore,royalwang/UICKeyChainStore