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Bench testing is obviusly the ultimate method but there is the risk of shearing off a healthy glow plug while removing it making a small job big in the process.
My prefered method is measuring current using a multimeter with a shunt. You could use a multimeter directly provided its current range is above 30 amps.
Sheared glowplugs can be removed using special glowplug extractors or you can make your own. There was a how to on the Instructables site a few months ago: How to remove broken glowplugs
Currently in tolsen's garage:
Trekka 1.9 DCI, Smart Cabrio Cdi (65 - 85 MPG) & Ford Transit 2.2 Duratorq TDCi