https://docs.spring.io/spring-kafka/reference/testing.html
    MockProducer, MockConsumer, assertj kafka-related assertions
https://testcontainers.com/guides/testing-spring-boot-kafka-listener-using-testcontainers/

baeldung
https://www.baeldung.com/spring-boot-kafka-testing
2024
https://habr.com/ru/articles/824594/
https://habr.com/ru/companies/alfastrah/articles/816057/