the action or process of testing or checking someone or something

diagnostic testing in symptomatic patients

testing has been made mandatory

the first official testing session

revealing a person's capabilities by putting them under strain; challenging

it's been quite a testing time for all of us

it was a poor race and was run in very testing conditions

take measures to check the quality, performance, or reliability of (something), especially before putting it into widespread use or practice

this range has not been tested on animals

several trial runs were carried out to test the special brakes