Radcom,
I'm sorry if I implied that to you, because that's not what I meant. When you have the plane ready to go it's sometimes easier to break in the motor on the plane. Doing it this way also let's you test your fuel system before flying. It will also give your plane a good "shaking" so that you can make sure all the bolts, nuts, and connections are tight.

But there is nothing wrong with a test stand either. I use test stands to break in a motor when the plane isn't ready yet. So you didn't waste you money at all.