== Real failure with org.springframework.kafka:spring-kafka as a direct dependency instead of org.springframework.boot:spring-boot-starter-kafka (pom.xml since fixed) ==

$ mvn -B test
[ERROR] Errors:
[ERROR]   KafkaListenerAwaitTest.messageSentIsEventuallyConsumed:49 ? ConditionTimeout Assertion condition defined as a Lambda expression in com.ankurm.awaitility.KafkaListenerAwaitTest
Expecting ConcurrentLinkedQueue:
  []
to contain:
  ["order-42-created"]
but could not find the following element(s):
  ["order-42-created"]
 within 5 seconds.
[INFO]
[ERROR] Tests run: 11, Failures: 0, Errors: 2, Skipped: 0

No exception at context startup, and the application context came up without a single warning.
Autowiring KafkaListenerEndpointRegistry directly in a scratch test and calling
getListenerContainers() on it confirmed the real cause: the bean did not exist. Neither did
KafkaTemplate, ConsumerFactory, or kafkaListenerContainerFactory. Grepping the full log for the
Spring Kafka logger prefix also confirmed it:

$ grep -c "o\.s\.k\." full-test-run.log
0