sniff test

nose test

An informal method for determining whether something is authentic, credible, or ethical, by using one's common sense or sense of propriety.

put to the test

To test (something or someone); to evaluate, scrutinize or explore by testing or experimentation.

red face test

A hypothetical test of a person's embarrassment that is either passed or failed. Saying one passes the red face test means one would not blush and thus would not be embarrassed by disclosing something to others or doing something, and saying one fails the red face test means a situation would cause them discernible embarrassment.

stand the test of time

To remain useful or valued over a long period of time; to last a long time.

straight-face test

A tongue-in-cheek test of the merits of an argument which asks whether it can be made with a straight face (without laughing).

test bed

Alternative form of testbed.

test someone's patience

To begin to frustrate someone.

test the waters

To explore or probe, as before making a commitment.