Maybe I was unclear. If your regestration says "test only" you must go to a test only. If not, you can go to any smog station.
The one I recomended is a test only and can do anything, but if your car fails they cannot fix it. If you need a cert, the state does not care where you got it from, and they are all the same! The only difference is how much you are paying the guy to do it, because they all set thier own prices.
I don't know if you know this, but I'm kind of in that business.