As a Zone 1 Sweep, I test rode Raptor (the day the cobra roll cracked) because they needed weight in the train to counteract the winds. But usually unless you're a ride op you won't be test riding - that's reserved for the ops opening the rides. And matt's right, there are ride nights for employees after hours several times each month. Of course, you can always ride when you're off duty too, so long as you're not in uniform! :)
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PO!NT OF VIEW - A Different Look at Roller Coasters
http://www.crosswinds.net/~justmayntz/thrills/