How to build a brushless motor test bench?

[gumleguf]

I discussed with some friends the possibility of building a test bench/test station for brushless motors. It seems to be an ongoing discussion on all forums if the more expensive motors are really better performing or not according to specifications. (Almost) no doubt they are better build quality, but what about performance?

It would be really fun to keep an updated list of the motors we come across and how they measure.

I am not too techie and can't figure out what would be required to build a "scientifically correct", fixed test station/test bench for brushless motors. Has anyone else done it and can you link to descriptions or pictures? Maybe you can even walk me through what would be a good way to build it?