From Wikipedia, the free encyclopedia. Desmond Tester (17 February 1919 – 31 December 2002) was an English and Australian film actor and television actor, host and executive. He was born in London, England. Among his most notable roles was that of the ill-fated boy Stevie in the Alfred Hitchcock film Sabotage (1936). Tester made his first stage appearance at the age of 12, receiving positive reviews from London critics. He was known more as a child actor in film in his native England. Tester's ...