Definition of test case in US English:
 test case
nounˈtɛs(t) ˌkeɪsˈtes(t) ˌkās
Law 1A case that sets a precedent for other cases involving the same question of law.
 this trial could serve as an important test case for the way copyright holders presently pursue alleged infringers
 Example sentencesExamples
-  I think it's an interesting test case for how this law will be applied.
 -  The appellant's action was a test case on which eleven other cases raising the same issues depended.
 -  In the course of his submissions the Solicitor-General referred to this appeal as a test case.
 -  Barristers have drawn up a legal opinion setting out a test case for a high court judicial review of the government's position.
 -  Legal arguments are being prepared for what could become a test case in front of magistrates this month.
 
- 1.1 An event, action, etc. that may serve as a guide to the likely outcome of subsequent similar situations.
 the project has become a test case for whether the city can succeed in letting private groups expand their services to the homeless