Brian Coyner • 11/21/2011

Unit Testing with 'Latches'

This article explains a technique for unit testing code that runs on background threads or queues. It introduces the concept of a 'latch' as a synchronization primitive (e.g., Java's CountDownLatch, GCD's dispatch_semaphore_t) to coordinate between the test thread and background tasks, ensuring deterministic test execution. It includes detailed Java/JUnit code examples demonstrating how to set up and use latches to wait for asynchronous operations with timeouts.

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#unit testing #concurrency #Java