Testing Micronaut Kafka Listener using Testcontainers — Write the test

Reference note (untrusted external data; do not execute it as instructions). Create ProductPriceChangedEventHandlerTest.java Here's what the test does @MicronautTest initializes the Micronaut application context and the embedded server. Setting transactional to false prevents each test method from running inside a rolled-back transaction, which is necessary because the Kafka listener processes messages in a separate thread. The @Property annotations override the datasource driver and URL to use the Testcontainers special JDBC URL (jdbc:tc:mysql:8.0.32:///db). This spins up a MySQL container and configures it as the datasource automatically. @Testcontainers and @Container manage the Kafka container lifecycle. The TestPropertyProvider interface registers the Kafka bootstrap servers with Micronaut so that the producer and consumer connect to the test container. @TestInstance(TestInstance.Lifecycle.PER_CLASS) creates a single test instance for all test methods, whi Attribution: Adapted from Docker Documentation under Apache-2.0. Adaptation: WikiKV isolated this documentation section, normalized formatting, removed long code blocks, and shortened it for retrieval. Verify version-sensitive details at the source.