Polish "Apply MeterRegistryCustomizer to composites"

Closes gh-12762

spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/metrics/MeterRegistryConfigurerIntegrationTests.java

@@ -25,21 +25,26 @@ import org.springframework.boot.actuate.autoconfigure.metrics.export.prometheus.
 import org.springframework.boot.actuate.autoconfigure.metrics.test.MetricsRun;
 import org.springframework.boot.test.context.runner.ApplicationContextRunner;
 
+/**
+ * Integration tests for {@link MeterRegistryConfigurer}.
+ *
+ * @author Jon Schneider
+ */
 public class MeterRegistryConfigurerIntegrationTests {
+
 	private ApplicationContextRunner contextRunner = new ApplicationContextRunner()
 			.with(MetricsRun.limitedTo(AtlasMetricsExportAutoConfiguration.class,
 					PrometheusMetricsExportAutoConfiguration.class));
 
 	@Test
 	public void binderMetricsAreSearchableFromTheComposite() {
-		this.contextRunner
-				.run((context) -> {
-					CompositeMeterRegistry composite = context.getBean(CompositeMeterRegistry.class);
+		this.contextRunner.run((context) -> {
+			CompositeMeterRegistry composite = context
+					.getBean(CompositeMeterRegistry.class);
 			composite.get("jvm.memory.used").gauge();
-
-					for (MeterRegistry registry : context.getBeansOfType(MeterRegistry.class).values()) {
-						registry.get("jvm.memory.used").gauge();
-					}
+			context.getBeansOfType(MeterRegistry.class)
+					.forEach((name, registry) -> registry.get("jvm.memory.used").gauge());
 		});
 	}
+
 }

spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/metrics/MeterRegistryCustomizerTests.java

@@ -67,12 +67,12 @@ public class MeterRegistryCustomizerTests {
 		this.contextRunner
 				.withUserConfiguration(MeterRegistryCustomizerConfiguration.class)
 				.run((context) -> {
-					MeterRegistry prometheus = context.getBean(PrometheusMeterRegistry.class);
+					MeterRegistry prometheus = context
+							.getBean(PrometheusMeterRegistry.class);
 					prometheus.get("jvm.memory.used").tags("job", "myjob").gauge();
-
 					MeterRegistry atlas = context.getBean(AtlasMeterRegistry.class);
-					assertThat(atlas.find("jvm.memory.used").tags("job", "myjob")
-							.gauge()).isNull();
+					assertThat(atlas.find("jvm.memory.used").tags("job", "myjob").gauge())
+							.isNull();
 				});
 	}