they make different test plugs that would go down into the pipe
they make an inflateable neopreme ball that would plug up
the hole ...then concrete it permanently into place...
I have seen many differnet ways to do this
plug the hole up with plastic bags , rags ect
then cement over the whole area.
whatever you feel comfortable with.
cement works best , its just a question as to how water
and vapor tight you wish it to be..