trial run 
noun
A preliminary test of how a new system or product works: the police used Sunday’s US Cup game as a trial run for next year’s games...
- With the experience of the trial run, they hope to fine tune the system and make it fool proof, so that passengers using the facility will not be disappointed.
- Two members of the operational team, it went on to say, had evaded security checks during a recent trial run at an unidentified New York airport.
- I am therefore going to run an experimental trial run next week, from Monday March 24 to Sunday March 30.
- optical tweezers
- optic angle
- optic axis
- optic chiasma
- optic commissure
- optic cup
- optic disc
- optic fiber
- optic fibre
- optic foramen
- optic ganglion
- optic glass
- optician
- opticist
- opticity
- optic lobe
- optic nerve
- optic neuritis
- optico-chemical
- opticociliary
- opticokinetic
- optic papilla
- optic peduncle
- optics
- optic stalk