I don't know if you read that wrong or if they are just off their rocker, but that test does not prove the relay is good. The clicking of the contacts shows the relay is operating. However, are the contacts inside any good? The easiest way is to remove the relay and jump the appropriate contacts in the socket. If the defroster starts working then the relay was bad. This is sometimes called "jumpering across the relay." Often the connections of the relay are stamped on the side of the relay so you can figure out which terminals to jump.

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1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra