Good question. And while I'm sure they do testing, it might take a little doing to find out what it is, and what the results are. In fact, it might take a little doing to find any rollover results.
Since I know that Consumer Reports cares a lot about rollover, I took a look at the car issue (just came out a few weeks ago), thinking that for sure they'd have a whole section on it -- but, unless I'm missing something, they don't have anything on it.
Judging by reputation, I would think that all Acura models are pretty good on this, probably better than pretty good. And anyway, the cars at greatest risk are the taller cars.