fire drill
From Longman Dictionary of Contemporary Englishfire drillˈfire drill noun [countable, uncountable] PRACTISE/PRACTICEan occasion when people pretend that a building is burning and practise leaving it, so that they learn what to do if there is a real fireExamples from the Corpusfire drill• We had a fire drill today in school.• The advantage of fire drill thinking is that it reminds you that the worst really can happen.