From Longman Dictionary of Contemporary Englishtestingtest‧ing /ˈtestɪŋ/ adjective DIFFICULTa testing situation, experience etc is difficult to deal with It’s been a testing time.
Examples from the Corpus
testing• In goal, Peter Liles gave a solid performance under very testing conditions.• Groove Tubes are special because of our unique testing procedures, not because of the way they were built.• However, local testing programmes can give information on individual schools.• But they were not allowed to take readings off the island of Novaya Zemlya, a former Soviet nuclear testing site.testing time• Nizan's apprenticeship was a testing time.• Retailing-which employs nearly one in ten people in Britain-must continue to expect a testing time.• This cuts testing time and reduces manufacturing costs.• When testing time arrives, you have a choice.• It is a testing time for Stockton.• The last two or three years have been a testing time for the 180 people who work at Angered.From Longman Business Dictionarytestingtest‧ing /ˈtestɪŋ/ noun [uncountable]1the process of checking something to see if it works, if it is suitable etcThe company specializes in software testing and software inspection.All our desktop computers undergo rigorous testing.Many people are against testing on animals.Phase one of the testing, which involves human testing of the drug, will be underway by the end of next year.2the process of asking someone questions, usually in written form, in order to find out their level of ability, if they are suitable for a job etcSome companies carry out on-line testing of candidates before they come in for interview. → psychological testing → psychometric testing 