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To take a motor vehicle on the road to assess its quality before purchase. / (figuratively) To make a preliminary assessment of something through its use.

A sample driving session in a motor vehicle, in order to assess its quality before purchase. / (figuratively) Any preliminary assessment of something through use.

(chemistry) A simple test for the acidity or alkalinity of a substance, using litmus paper.

any of several tests to measure a specific reaction between antigen and antibody which results in a visible precipitate

A filmed audition to test the screen-acting ability of a potential actor. / (slang) Synonym of rough ride

To perform any of the above tests.

A test for leaks involving blowing smoke into a tube or pipe.

(idiomatic) An informal check of an idea or proposal, using one's common sense or sense of propriety.

A fluoroscopic medical test during which the examinee is asked to "sniff" (quickly breathe in through the nose); diaphragm fluoroscopy.