Use @EmbeddedKafka for Integration Tests

`@EmbeddedKafka` now supports JUnit 5 without the need for a Spring
test application context. Remove the previous workaround that replaced
the JUnit4 `@ClassRule` and use `TopicBuilder` to build the
topic bean.

See gh-17355

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/kafka/KafkaAutoConfigurationIntegrationTests.java

@@ -21,9 +21,7 @@ import java.util.concurrent.TimeUnit;
 
 import org.apache.kafka.clients.admin.NewTopic;
 import org.apache.kafka.clients.producer.Producer;
-import org.junit.jupiter.api.AfterAll;
 import org.junit.jupiter.api.AfterEach;
-import org.junit.jupiter.api.BeforeAll;
 import org.junit.jupiter.api.Test;
 
 import org.springframework.boot.test.util.TestPropertyValues;
@@ -33,10 +31,12 @@ import org.springframework.context.annotation.Configuration;
 import org.springframework.kafka.annotation.EnableKafkaStreams;
 import org.springframework.kafka.annotation.KafkaListener;
 import org.springframework.kafka.config.StreamsBuilderFactoryBean;
+import org.springframework.kafka.config.TopicBuilder;
 import org.springframework.kafka.core.DefaultKafkaProducerFactory;
 import org.springframework.kafka.core.KafkaTemplate;
 import org.springframework.kafka.support.KafkaHeaders;
-import org.springframework.kafka.test.EmbeddedKafkaBroker;
+import org.springframework.kafka.test.condition.EmbeddedKafkaCondition;
+import org.springframework.kafka.test.context.EmbeddedKafka;
 import org.springframework.messaging.handler.annotation.Header;
 
 import static org.assertj.core.api.Assertions.assertThat;
@@ -47,21 +47,15 @@ import static org.assertj.core.api.Assertions.assertThat;
  * @author Gary Russell
  * @author Stephane Nicoll
  */
+@EmbeddedKafka(topics = KafkaAutoConfigurationIntegrationTests.TEST_TOPIC)
 class KafkaAutoConfigurationIntegrationTests {
 
-	private static final String TEST_TOPIC = "testTopic";
+	public static final String TEST_TOPIC = "testTopic";
 
 	private static final String ADMIN_CREATED_TOPIC = "adminCreatedTopic";
 
-	public static final EmbeddedKafkaBroker embeddedKafka = new EmbeddedKafkaBroker(1, true, TEST_TOPIC);
-
 	private AnnotationConfigApplicationContext context;
 
-	@BeforeAll
-	static void setUp() {
-		embeddedKafka.afterPropertiesSet();
-	}
-
 	@AfterEach
 	void close() {
 		if (this.context != null) {
@@ -69,11 +63,6 @@ class KafkaAutoConfigurationIntegrationTests {
 		}
 	}
 
-	@AfterAll
-	static void tearDown() {
-		embeddedKafka.destroy();
-	}
-
 	@SuppressWarnings({ "unchecked", "rawtypes" })
 	@Test
 	void testEndToEnd() throws Exception {
@@ -113,7 +102,7 @@ class KafkaAutoConfigurationIntegrationTests {
 	}
 
 	private String getEmbeddedKafkaBrokersAsString() {
-		return embeddedKafka.getBrokersAsString();
+		return EmbeddedKafkaCondition.getBroker().getBrokersAsString();
 	}
 
 	@Configuration(proxyBeanMethods = false)
@@ -126,7 +115,7 @@ class KafkaAutoConfigurationIntegrationTests {
 
 		@Bean
 		public NewTopic adminCreated() {
-			return new NewTopic(ADMIN_CREATED_TOPIC, 10, (short) 1);
+			return TopicBuilder.name(ADMIN_CREATED_TOPIC).partitions(10).replicas(1).build();
 		}
 
 	}