That's basically what Mike Copioli (developer of the Talon) did to create his test rig. You can see his results in the Talon
doc available on the Cross The Road Electronics website.
I think the resistor value Mike used was zero Ohm -- i.e., he shorted the leads of one CIM motor on a CIMPle box, and drove the other CIM motor using the Talon.
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Edit: Mike also did some testing with infinite Ohms (open circuit) on the leads of the test rig motor, to check linearity of the speed response vs. input pulse width. This is indeed a "poor man's" version of the testing that Ether did later using a Magtrol dynamometer in my lab at Whirlpool.
You could use other values of resistance across the test motor leads; i.e., more than zero and less than infinity, but please check that the rating of the resistor is enough for the power the motor controller will be supplying.
__________________
Richard Wallace
Mentor since 2011 for FRC 3620 Average Joes (St. Joseph, Michigan)
Mentor 2002-10 for FRC 931 Perpetual Chaos (St. Louis, Missouri)
since 2003
I believe in intuition and inspiration. Imagination is more important than knowledge. For knowledge is limited, whereas imagination embraces the entire world, stimulating progress, giving birth to evolution. It is, strictly speaking, a real factor in scientific research.
(Cosmic Religion : With Other Opinions and Aphorisms (1931) by Albert Einstein, p. 97)