an acid test

an acid test

a test which will really prove the value, quality, or truth of something The new show was well received but viewing figures for the next episode will be the real acid test. The acid test for the product will be whether people actually buy it.
See also: acid, test
References in periodicals archive ?
26 (ANI): When England take on India on Sunday in a 2011 World Cup fixture, they are likely to face an acid test to establish how much they have improved in the one-day format.
Our next four games are against Coleraine, Linfield, Ballymena and Distillery so the next few weeks will be an acid test for us.
Nonetheless, before the auditor signs off on the engagement, he or she should use an acid test to evaluate the analytical review, reflecting on this question: If management was attempting to conceal a material financial statement fraud, where would it show up?