Steroid Testing and Ph/Ds vs Test Boosters

[Six Point]

I am curious how olympic/sport steroid testing really works. Obviously AAS are illigal and PH/DS and "grey area" but test boosters like t-bomb, pink magic, animal stak and DAA are sold in stores. How does steroid testing differ for all of this? Basically, I am under the impression that superdrol will cause a positive reading for AAS, but can't tbomb plus DAA cause the same reading? And if clen isn't anabolic, how is it tested for (is it a specific test or does it pop with a sterod test)?