There are kits for that purpose. Typically they include a pump (like a bicycle tire pump) a couple test caps (like ardiator caps, but they don't have a built in valve) and a pressure gauge. Auto parts stores around here will rent them out. If you rent or buy one make sure it's got a test cap that will fit your rad. Then you just hook everything up, pump the system up to a certain pressure (~5psi over high for the system) and watch to see if the pressure holds or if you've got a purdy green shower. I can't remember what the average pressure for our system is at the moment.
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