Repackage output capture and always use extension declaratively

Closes gh-17029

spring-boot-samples/spring-boot-sample-data-mongodb/src/main/java/sample/data/mongo/SampleMongoApplication.java

@@ -16,10 +16,14 @@
 
 package sample.data.mongo;
 
+import java.util.concurrent.TimeUnit;
+
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.CommandLineRunner;
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.boot.autoconfigure.mongo.MongoClientSettingsBuilderCustomizer;
+import org.springframework.context.annotation.Bean;
 
 @SpringBootApplication
 public class SampleMongoApplication implements CommandLineRunner {
@@ -55,6 +59,13 @@ public class SampleMongoApplication implements CommandLineRunner {
 		}
 	}
 
+	@Bean
+	public MongoClientSettingsBuilderCustomizer customizer() {
+		return (builder) -> builder
+				.applyToConnectionPoolSettings((connectionPool) -> connectionPool
+						.maxConnectionIdleTime(5, TimeUnit.MINUTES));
+	}
+
 	public static void main(String[] args) {
 		SpringApplication.run(SampleMongoApplication.class, args);
 	}

spring-boot-samples/spring-boot-sample-data-mongodb/src/test/java/sample/data/mongo/SampleMongoApplicationTests.java

@@ -20,8 +20,8 @@ import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.extension.ExtendWith;
 
 import org.springframework.boot.test.context.SpringBootTest;
-import org.springframework.boot.test.extension.CapturedOutput;
-import org.springframework.boot.test.extension.OutputExtension;
+import org.springframework.boot.test.system.CapturedOutput;
+import org.springframework.boot.test.system.OutputCaptureExtension;
 
 import static org.assertj.core.api.Assertions.assertThat;
 
@@ -31,7 +31,7 @@ import static org.assertj.core.api.Assertions.assertThat;
  * @author Dave Syer
  * @author Andy Wilkinson
  */
-@ExtendWith(OutputExtension.class)
+@ExtendWith(OutputCaptureExtension.class)
 @SpringBootTest
 class SampleMongoApplicationTests {