When the new CBA gets done testing will 1000% be a part of it. But for now there is no testing. So if a player wanted to he could do a few cycles, gain the benefits over the course of a few months, assuming he started right as the CBA expired back in December, and then have it completely out of his system by the time the new CBA is signed and testing is happening again. Im gonna guess quite a lot of guys did this, especially the fringe major leaguers.