smell test

Short definition from Wiktionary

Noun

1. 1
   An informal method for determining whether something is authentic, credible, or ethical, by using one's common sense or sense of propriety.
2. 2
   An inspection of an object using the sense of smell, as for freshness of food or cleanliness of clothing.
3. 3
   An assessment of a subject's ability to detect and distinguish odors.