Wiktionary
nose test
n. 1 (context idiomatic English) An informal method for determining whether something is authentic, credible, or ethical, by using one's common sense or sense of propriety. 2 An inspection of an object using the sense of smell, as for freshness of food. 3 (context physiology English) An inspection of the nasal passages or a trial of their function, as for breathing difficulties.
Usage examples of "nose test".
He let his nose test the scents, catching the mixture of free-flowing air, overlaid with the scent of shambletowners and their excrement, and the faint hint of omnipresent rat.