imo, he looks like the batting equivalent of broad as a bowler.
I don't actually see what playing him at test level is going to achieve until he irons out the mess his technique is. He's obviously built for success mentally, which in test cricket is a huge factor, but everything needs to be sorted out, and there's little point doing that at an international level because the harsh truth is he may not be able to do it. If he does though, should do very well.
Broad is the same. No weapons, needs to go to the county game and see if he can learn how to swing it and control it, then it serves a purpose playing him internationally. Just because he's 22, putting him test cricket will not guarantee he develops an outswinger later.