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@tynan
You should have the two holes (obviously!) and two cable stop things that sit in the holes, as the cable runs through the top tube is doesn't need to sit in a tube of any kind.
You will often see a plastic tube stuck through a bike frame that has internal routing, like a Klein or similar, but this is to help you guide the cable from hole to hole, once you have the cable threaded through, you can pull out this plastic tube.
DO NOT pull this tube out before you have put your cable through, otherwise it can be a nightmare to feed the cable through. (think 2 hours spent with cotton, magnets and a sewing needle)
Also when you change cables or service your bike or whatever - you need to unfasten the cable from your (rear) brake, leave the cable in place (through the top tube) then thread the plastic tube over the cable so it goes through the frame, tape down the two ends that stick out of the two holes and then pull your cable out.
I have had a few internally routed frames over the years, I think they look great with no cables on the outside.