There is no definitive test. Anytest that measures how quickly someone can react to a stimulus, and accurately execute a prompted action with their hands should do the trick.
An example: Who in a group of people is best at the arcade game "Whack-a-mole?" that person probably has the best hand-eye coordination. (or, at least the best reflexes. For a better test, chose an evaluation that requires more precision and finese than a frenzied game of whack-a-mole.)