We've been talking about constant charge "c" and you will need to clarify what part of that you'd like to verify. I'm not even sure if anyone has a std for charge C , I used to use actual constant discharge "C" divided by 10. You can easily set a charge for that value that is on the label and start the charge. If you are happy with what you see then it is verified?

For discharging "c" the battery can be discharged at the "c" rating to see if you can tolerate the temp rise and/or volt drop. It can also be tested thru IR and estimated fairly close.