Kafka for JUnit makes it easy to write integration tests for custom-built Kafka-enabled components as well as entire systems that integrate with a Kafka cluster. In the course of this article, I'd like to demonstrate how you can leverage this testing library to write whitebox tests for software components that integrate with Kafka. We'll start off with the write-path of a small lifecycle event service and implement a custom publisher on top of the Kafka Clients library that ought to be tested.

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