Add test to show that pop_push(x) does not necessarily yield the same heap
Add test to show that pop_push(x) does not necessarily yield the same heap

ORNL-CEES/DataTransferKit,ORNL-CEES/DataTransferKit,ORNL-CEES/DataTransferKit,dalg24/DataTransferKit,Rombur/DataTransferKit,dalg24/DataTransferKit,Rombur/DataTransferKit,dalg24/DataTransferKit,ORNL-CEES/DataTransferKit,dalg24/DataTransferKit,Rombur/DataTransferKit,Rombur/DataTransferKit