They test them quite a bit at ski resorts, but the public generally doesn't get the first ride until after the first snowfall. So you don't quite get anticipation to ride it as soon as it's ready, as mother nature dictates the schedule.
I do think the testing is a bit of red herring though. I think the limiting factor is not the skyliner itself, I think it's the infrastructure around it. I'm betting they won't open the skyliner until the entrance/security changes are complete at DHS along with at least the station at trinidad.