Add untagged stack test case.
Add untagged stack test case.

wackerly/faucet,shivarammysore/faucet,Bairdo/faucet,REANNZ/faucet,faucetsdn/faucet,wackerly/faucet,trungdtbk/faucet,isomer/faucet,trentindav/faucet,Bairdo/faucet,anarkiwi/faucet,faucetsdn/faucet,gizmoguy/faucet,byllyfish/faucet,mwutzke/faucet,gizmoguy/faucet,byllyfish/faucet,shivarammysore/faucet,trentindav/faucet,mwutzke/faucet,isomer/faucet,anarkiwi/faucet,trungdtbk/faucet,REANNZ/faucet