Create Kafka sample topic

spring-boot-samples/spring-boot-sample-kafka/src/main/java/sample/kafka/SampleKafkaApplication.java

 /*
- * Copyright 2012-2018 the original author or authors.
+ * Copyright 2012-2019 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,6 +16,8 @@
 
 package sample.kafka;
 
+import org.apache.kafka.clients.admin.NewTopic;
+
 import org.springframework.boot.ApplicationRunner;
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
@@ -28,6 +30,11 @@ public class SampleKafkaApplication {
 		SpringApplication.run(SampleKafkaApplication.class, args);
 	}
 
+	@Bean
+	public NewTopic kafkaTestTopic() {
+		return new NewTopic("testTopic", 10, (short) 2);
+	}
+
 	@Bean
 	public ApplicationRunner runner(Producer producer) {
 		return (args) -> producer.send(new SampleMessage(1, "A simple test message"));

spring-boot-samples/spring-boot-sample-kafka/src/test/java/sample/kafka/SampleKafkaApplicationTests.java

@@ -33,7 +33,7 @@ import static org.assertj.core.api.Assertions.assertThat;
  */
 @SpringBootTest(
 		properties = "spring.kafka.bootstrap-servers=${spring.embedded.kafka.brokers}")
-@EmbeddedKafka
+@EmbeddedKafka(topics = "testTopic")
 class SampleKafkaApplicationTests {
 
 	@RegisterExtension