serve as a/(one's) guinea pig

serve as a/(one's) guinea pig

To act or function as the object of a test, experiment, or assessment. We'll have a limited release the product and let this region serve as a guinea pig. If it is received well, we can expand production and distribution to the rest of the county. A: "I have a wild new dish I'd like you to try!" B: "No way! I have no interest in serving as your guinea pig again."See also: guinea, pig, serve