Testa was born in New York City to Italian immigrants, and was raised in the Bronx.[1] He began his professional career in 1946 at the age of 17 with the Newburgh Hummingbirds. He threw and batted right-handed, stood 5 feet 8 inches (1.73 m) tall and weighed 180 pounds (82 kg).
Testa had one of the briefest major league careers ever. He played just one inning of one game for the San Francisco Giants in 1958, never coming to bat in the major leagues. In his one chance on defense, he committed an error.[2] Later that season, Testa was named the team's bullpen coach.[3]
After retiring from Lehman, Testa joined the New York Yankees as their batting practice coach, serving on five World Championship Teams. Testa died in 2018 at his home in Hastings-on-Hudson, New York, at the age of 90.[1]