life test1
/ˈlʌɪf tɛst/noun
A test made on a sample of manufactured products or components in specified operating conditions, either for a certain length of time or until failure occurs, in order to determine their reliability; (also, as a mass noun) testing of this kind.
Origin
Late 19th century. From life + test.
life-test2
/ˈlʌɪf tɛst/verb
[with object] To perform a life test upon (a product or component).
Origin
1920s. From life test. Compare test and life testing.