When I get a previously owned camera I quickly learn the fundamentals and load a 12 exposure roll of Superia and take 12 quick shots at different speeds and apertures. Also, I take vertical and horizontal shots to check the rangefinder alignment. Good luck to you.
A good trick is to listen to alternate shutter speeds: 1, 1/4, 1/15, etc., then 1/2, 1/8, 1/30... You can hear the differences between the speeds much easier.
Also check that the shutter opens at all at the maximum speed (back open, lens off).
If the RF is OK at infinity, it's probably OK elsewhere.
Then run a test roll, deliberately trying to use as many speeds as possible.
First you pick it up and exclaim, "This thing is so light it just can't be any good. If a camera doesn't feel heavy in my hands, it must be poorly made!"
I had an FSU camera where an internal rangefinder component flopped to and fro... Likewise a 50/2 Jupiter with a floating element that floated of its own accord.
I don't know if there's much point in carefully testing the shutter speeds for accuracy. It's an electronically controlled shutter, so it will basically break down completely (tens of thousands of shots) before it starts getting too slow or too fast.
Just make sure the film transport mechanisms work well and the RF is aligned properly. Enjoy your camera :-D.
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