if the NBA does test good for them but who cares like you said it will not make you a better player at all..
I think many NBA players would be interested in being stronger, faster, quicker, and have better recovery time from injuries.
The perception that all steroids can do for a person is make them strong and none athletic, ala bonds and Big mac is false. Those two wanted to hit home runs, a power dependent skill, so they didn't train for lean muscle much at all.
There is a reason some of the most steroid riddled sports are Olympic sprinting and swimming , and those guys aren't doing cocktails to get jacked, there doing lean muscle cocktails to get faster.