litmus test

as in acid test
something (such as an opinion about a political or moral issue) that is used to make a judgment about whether someone or something is acceptable The party is using attitudes about gun control as a litmus test for political candidates.

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“Litmus test.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/litmus%20test. Accessed 7 Feb. 2023.

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