simple past tense and past participle of test
"The engineers tested the new prototype before launching it to the public."
In plain English: To test something means to try it out to see if it works or is good.
"The new medicine passed all the safety tests before doctors started giving it to patients."
tested and proved to be reliable
"We decided to book the hotel after reading that it had been thoroughly tested and proved to be reliable by thousands of travelers over the years."
Derived from the Old French tester, this past participle originally meant to weigh or measure, evolving into its current sense of examining something to determine quality or performance. The root traces back further to the Latin testari, which referred to making a will or witnessing an event.