I agree, if you can't see any telling difference by looking in the mirror what is testing going to do for you? Don't get impatient. I guarantee you as sure as you're reading this that if you stay consistent and keep at it you will absolutely see your progress all by yourself without anybody having to prove it to you. Just wait til the first time somebody you haven't seen in a while notices first thing. That feels great. I saw a guy from a building I used to work in the other day that I hadn't seen in several years. He's from Malaysia and doesn't speak in our style. He saw me before I saw him. He walked up and Said in a surprised tone, "GREG!!! you look...... uuhhh....... strong!!!, what you been doing!!!"
No test can compare to that, but it takes time and persistence and I still have a LONG way to go too..