Polish

Closes gh-10948

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

@@ -134,7 +134,7 @@ public class MetricsAutoConfigurationTests {
 		}
 
 		private DataSource createDataSource() {
-			String url = "jdbc:hsqldb:mem:test-" + UUID.randomUUID().toString();
+			String url = "jdbc:hsqldb:mem:test-" + UUID.randomUUID();
 			return DataSourceBuilder.create().url(url).build();
 		}
 

spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/metrics/integration/SpringIntegrationMetrics.java

@@ -63,15 +63,15 @@ public class SpringIntegrationMetrics implements MeterBinder, SmartInitializingS
 
 	@Override
 	public void bindTo(MeterRegistry registry) {
-		registerGuage(registry, this.configurer, this.tags,
+		registerGauge(registry, this.configurer, this.tags,
 				"spring.integration.channelNames",
 				"The number of spring integration channels",
 				(configurer) -> configurer.getChannelNames().length);
-		registerGuage(registry, this.configurer, this.tags,
+		registerGauge(registry, this.configurer, this.tags,
 				"spring.integration.handlerNames",
 				"The number of spring integration handlers",
 				(configurer) -> configurer.getHandlerNames().length);
-		registerGuage(registry, this.configurer, this.tags,
+		registerGauge(registry, this.configurer, this.tags,
 				"spring.integration.sourceNames",
 				"The number of spring integration sources",
 				(configurer) -> configurer.getSourceNames().length);
@@ -105,7 +105,7 @@ public class SpringIntegrationMetrics implements MeterBinder, SmartInitializingS
 			registerTimedGauge(registry, handlerMetrics, tagsWithHandler,
 					"spring.integration.handler.duration.mean",
 					"The mean handler duration", MessageHandlerMetrics::getMeanDuration);
-			registerGuage(registry, handlerMetrics, tagsWithHandler,
+			registerGauge(registry, handlerMetrics, tagsWithHandler,
 					"spring.integration.handler.activeCount",
 					"The number of active handlers",
 					MessageHandlerMetrics::getActiveCount);
@@ -133,7 +133,7 @@ public class SpringIntegrationMetrics implements MeterBinder, SmartInitializingS
 		}
 	}
 
-	private <T> void registerGuage(MeterRegistry registry, T object, Iterable<Tag> tags,
+	private <T> void registerGauge(MeterRegistry registry, T object, Iterable<Tag> tags,
 			String name, String description, ToDoubleFunction<T> value) {
 		Gauge.Builder<?> builder = Gauge.builder(name, object, value);
 		builder.tags(this.tags).description(description).register(registry);

spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/health/HealthTests.java

@@ -45,7 +45,7 @@ public class HealthTests {
 	public void createWithStatus() throws Exception {
 		Health health = Health.status(Status.UP).build();
 		assertThat(health.getStatus()).isEqualTo(Status.UP);
-		assertThat(health.getDetails().size()).isEqualTo(0);
+		assertThat(health.getDetails()).isEmpty();
 	}
 
 	@Test
@@ -100,7 +100,7 @@ public class HealthTests {
 	public void unknown() throws Exception {
 		Health health = new Health.Builder().unknown().build();
 		assertThat(health.getStatus()).isEqualTo(Status.UNKNOWN);
-		assertThat(health.getDetails().size()).isEqualTo(0);
+		assertThat(health.getDetails()).isEmpty();
 	}
 
 	@Test
@@ -114,7 +114,7 @@ public class HealthTests {
 	public void up() throws Exception {
 		Health health = new Health.Builder().up().build();
 		assertThat(health.getStatus()).isEqualTo(Status.UP);
-		assertThat(health.getDetails().size()).isEqualTo(0);
+		assertThat(health.getDetails()).isEmpty();
 	}
 
 	@Test
@@ -130,28 +130,28 @@ public class HealthTests {
 	public void down() throws Exception {
 		Health health = Health.down().build();
 		assertThat(health.getStatus()).isEqualTo(Status.DOWN);
-		assertThat(health.getDetails().size()).isEqualTo(0);
+		assertThat(health.getDetails()).isEmpty();
 	}
 
 	@Test
 	public void outOfService() throws Exception {
 		Health health = Health.outOfService().build();
 		assertThat(health.getStatus()).isEqualTo(Status.OUT_OF_SERVICE);
-		assertThat(health.getDetails().size()).isEqualTo(0);
+		assertThat(health.getDetails()).isEmpty();
 	}
 
 	@Test
 	public void statusCode() throws Exception {
 		Health health = Health.status("UP").build();
 		assertThat(health.getStatus()).isEqualTo(Status.UP);
-		assertThat(health.getDetails().size()).isEqualTo(0);
+		assertThat(health.getDetails()).isEmpty();
 	}
 
 	@Test
 	public void status() throws Exception {
 		Health health = Health.status(Status.UP).build();
 		assertThat(health.getStatus()).isEqualTo(Status.UP);
-		assertThat(health.getDetails().size()).isEqualTo(0);
+		assertThat(health.getDetails()).isEmpty();
 	}
 
 }

spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/info/EnvironmentInfoContributorTests.java

@@ -50,7 +50,7 @@ public class EnvironmentInfoContributorTests {
 	public void extractNoEntry() {
 		TestPropertyValues.of("foo=bar").applyTo(this.environment);
 		Info actual = contributeFrom(this.environment);
-		assertThat(actual.getDetails().size()).isEqualTo(0);
+		assertThat(actual.getDetails()).isEmpty();
 	}
 
 	@Test

spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/metrics/web/servlet/WebMvcMetricsFilterTests.java

@@ -68,7 +68,7 @@ import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.
 import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
 
 /**
- * Tests for {@link WebMvcMetricsFilter}
+ * Tests for {@link WebMvcMetricsFilter}.
  *
  * @author Jon Schneider
  */

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/orm/jpa/HibernateJpaConfiguration.java

@@ -154,7 +154,7 @@ class HibernateJpaConfiguration extends JpaBaseConfiguration {
 
 	private boolean runningOnWebSphere() {
 		return ClassUtils.isPresent(
-				"com.ibm.websphere.jtaextensions." + "ExtendedJTATransaction",
+				"com.ibm.websphere.jtaextensions.ExtendedJTATransaction",
 				getClass().getClassLoader());
 	}
 
@@ -175,7 +175,7 @@ class HibernateJpaConfiguration extends JpaBaseConfiguration {
 		}
 		catch (LinkageError ex) {
 			// NoClassDefFoundError can happen if Hibernate 4.2 is used and some
-			// containers (e.g. JBoss EAP 6) wraps it in the superclass LinkageError
+			// containers (e.g. JBoss EAP 6) wrap it in the superclass LinkageError
 			if (!isUsingJndi()) {
 				throw new IllegalStateException("Unable to set Hibernate JTA "
 						+ "platform, are you using the correct "

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/jdbc/DataSourceInitializerInvokerTests.java

@@ -50,7 +50,7 @@ import static org.assertj.core.api.Assertions.assertThat;
 import static org.junit.Assert.fail;
 
 /**
- * Tests for {@link DataSourceInitializer}.
+ * Tests for {@link DataSourceInitializerInvoker}.
  *
  * @author Dave Syer
  * @author Stephane Nicoll
@@ -61,7 +61,7 @@ public class DataSourceInitializerInvokerTests {
 			.withConfiguration(AutoConfigurations.of(DataSourceAutoConfiguration.class))
 			.withPropertyValues("spring.datasource.initialization-mode=never",
 					"spring.datasource.url:jdbc:hsqldb:mem:init-"
-							+ UUID.randomUUID().toString());
+							+ UUID.randomUUID());
 
 	@Test
 	public void dataSourceInitialized() {

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/jdbc/DataSourceInitializerTests.java

@@ -102,7 +102,7 @@ public class DataSourceInitializerTests {
 
 	private HikariDataSource createDataSource() {
 		return DataSourceBuilder.create().type(HikariDataSource.class)
-				.url("jdbc:h2:mem:" + UUID.randomUUID().toString()).build();
+				.url("jdbc:h2:mem:" + UUID.randomUUID()).build();
 	}
 
 }

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/jdbc/DataSourceJmxConfigurationTests.java

@@ -113,7 +113,7 @@ public class DataSourceJmxConfigurationTests {
 
 	private void load(Class<?> config, String... environment) {
 		AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext();
-		String jdbcUrl = "jdbc:hsqldb:mem:test-" + UUID.randomUUID().toString();
+		String jdbcUrl = "jdbc:hsqldb:mem:test-" + UUID.randomUUID();
 		TestPropertyValues.of(environment).and("spring.datasource.url=" + jdbcUrl)
 				.applyTo(context);
 		if (config != null) {

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/orm/jpa/AbstractJpaAutoConfigurationTests.java

@@ -254,7 +254,7 @@ public abstract class AbstractJpaAutoConfigurationTests {
 		}
 
 		private DataSource createRandomDataSource() {
-			String url = "jdbc:h2:mem:init-" + UUID.randomUUID().toString();
+			String url = "jdbc:h2:mem:init-" + UUID.randomUUID();
 			return DataSourceBuilder.create().url(url).build();
 		}
 
@@ -275,7 +275,7 @@ public abstract class AbstractJpaAutoConfigurationTests {
 		}
 
 		private DataSource createRandomDataSource() {
-			String url = "jdbc:h2:mem:init-" + UUID.randomUUID().toString();
+			String url = "jdbc:h2:mem:init-" + UUID.randomUUID();
 			return DataSourceBuilder.create().url(url).build();
 		}
 

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/web/servlet/HttpEncodingAutoConfigurationTests.java

@@ -147,7 +147,7 @@ public class HttpEncodingAutoConfigurationTests {
 		Map<String, WebServerFactoryCustomizer<?>> beans = getWebServerFactoryCustomizerBeans();
 		assertThat(beans.size()).isEqualTo(1);
 		assertThat(this.context.getBean(MockServletWebServerFactory.class)
-				.getLocaleCharsetMappings().size()).isEqualTo(0);
+				.getLocaleCharsetMappings()).isEmpty();
 	}
 
 	@Test

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/web/servlet/WebMvcAutoConfigurationTests.java

@@ -190,7 +190,7 @@ public class WebMvcAutoConfigurationTests {
 				.run((context) -> {
 					Map<String, List<Resource>> locations = getResourceMappingLocations(
 							context);
-					assertThat(locations.size()).isEqualTo(0);
+					assertThat(locations).isEmpty();
 				});
 	}
 

spring-boot-project/spring-boot-devtools/src/test/java/org/springframework/boot/devtools/filewatch/FileSystemWatcherTests.java

@@ -261,7 +261,7 @@ public class FileSystemWatcherTests {
 		this.watcher.start();
 		FileCopyUtils.copy("abc".getBytes(), file);
 		Thread.sleep(100);
-		assertThat(this.changes.size()).isEqualTo(0);
+		assertThat(this.changes).isEmpty();
 		FileCopyUtils.copy("abc".getBytes(), trigger);
 		this.watcher.stopAfter(1);
 		ChangedFiles changedFiles = getSingleChangedFiles();

spring-boot-project/spring-boot-devtools/src/test/java/org/springframework/boot/devtools/restart/ChangeableUrlsTests.java

@@ -54,13 +54,13 @@ public class ChangeableUrlsTests {
 	@Test
 	public void fileUrl() throws Exception {
 		URL url = this.temporaryFolder.newFile().toURI().toURL();
-		assertThat(ChangeableUrls.fromUrls(url).size()).isEqualTo(0);
+		assertThat(ChangeableUrls.fromUrls(url)).isEmpty();
 	}
 
 	@Test
 	public void httpUrl() throws Exception {
 		URL url = new URL("http://spring.io");
-		assertThat(ChangeableUrls.fromUrls(url).size()).isEqualTo(0);
+		assertThat(ChangeableUrls.fromUrls(url)).isEmpty();
 	}
 
 	@Test
@@ -69,7 +69,7 @@ public class ChangeableUrlsTests {
 				makeUrl("spring-boot-autoconfigure"), makeUrl("spring-boot-actuator"),
 				makeUrl("spring-boot-starter"),
 				makeUrl("spring-boot-starter-some-thing"));
-		assertThat(urls.size()).isEqualTo(0);
+		assertThat(urls).isEmpty();
 	}
 
 	@Test

spring-boot-project/spring-boot-devtools/src/test/java/org/springframework/boot/devtools/restart/classloader/RestartClassLoaderTests.java

@@ -168,7 +168,7 @@ public class RestartClassLoaderTests {
 		String name = PACKAGE_PATH + "/Sample.txt";
 		this.updatedFiles.addFile(name, new ClassLoaderFile(Kind.DELETED, null));
 		List<URL> resources = toList(this.reloadClassLoader.getResources(name));
-		assertThat(resources.size()).isEqualTo(0);
+		assertThat(resources).isEmpty();
 	}
 
 	@Test

spring-boot-project/spring-boot-test/src/test/java/org/springframework/boot/test/context/runner/AbstractApplicationContextRunnerTests.java

@@ -52,7 +52,7 @@ public abstract class AbstractApplicationContextRunnerTests<T extends AbstractAp
 
 	@Test
 	public void runWithSystemPropertiesShouldSetAndRemoveProperties() {
-		String key = "test." + UUID.randomUUID().toString();
+		String key = "test." + UUID.randomUUID();
 		assertThat(System.getProperties().containsKey(key)).isFalse();
 		get().withSystemProperties(key + "=value")
 				.run((context) -> assertThat(System.getProperties()).containsEntry(key,
@@ -63,7 +63,7 @@ public abstract class AbstractApplicationContextRunnerTests<T extends AbstractAp
 	@Test
 	public void runWithSystemPropertiesWhenContextFailsShouldRemoveProperties()
 			throws Exception {
-		String key = "test." + UUID.randomUUID().toString();
+		String key = "test." + UUID.randomUUID();
 		assertThat(System.getProperties().containsKey(key)).isFalse();
 		get().withSystemProperties(key + "=value")
 				.withUserConfiguration(FailingConfig.class)
@@ -74,7 +74,7 @@ public abstract class AbstractApplicationContextRunnerTests<T extends AbstractAp
 	@Test
 	public void runWithSystemPropertiesShouldRestoreOriginalProperties()
 			throws Exception {
-		String key = "test." + UUID.randomUUID().toString();
+		String key = "test." + UUID.randomUUID();
 		System.setProperty(key, "value");
 		try {
 			assertThat(System.getProperties().getProperty(key)).isEqualTo("value");
@@ -91,7 +91,7 @@ public abstract class AbstractApplicationContextRunnerTests<T extends AbstractAp
 	@Test
 	public void runWithSystemPropertiesWhenValueIsNullShouldRemoveProperty()
 			throws Exception {
-		String key = "test." + UUID.randomUUID().toString();
+		String key = "test." + UUID.randomUUID();
 		System.setProperty(key, "value");
 		try {
 			assertThat(System.getProperties().getProperty(key)).isEqualTo("value");

spring-boot-project/spring-boot-tools/spring-boot-loader/src/test/java/org/springframework/boot/loader/data/RandomAccessDataFileTests.java

@@ -310,7 +310,7 @@ public class RandomAccessDataFileTests {
 		Field filesField = filePool.getClass().getDeclaredField("files");
 		filesField.setAccessible(true);
 		Queue<?> queue = (Queue<?>) filesField.get(filePool);
-		assertThat(queue.size()).isEqualTo(0);
+		assertThat(queue).isEmpty();
 	}
 
 	@Test

spring-boot-project/spring-boot/src/test/java/org/springframework/boot/context/properties/bind/BackCompatibilityBinderIntegrationTests.java

@@ -32,7 +32,7 @@ import static org.assertj.core.api.Assertions.assertThat;
  *
  * @author Phillip Webb
  */
-public class BackCompatibiltyBinderIntegrationTests {
+public class BackCompatibilityBinderIntegrationTests {
 
 	@Test
 	public void bindWhenBindingCamelCaseToEnvironmentWithExtractUnderscore()
@@ -49,7 +49,7 @@ public class BackCompatibiltyBinderIntegrationTests {
 	}
 
 	@Test
-	public void bindWhenUsingSystemEnvronmentToOverride() {
+	public void bindWhenUsingSystemEnvironmentToOverride() {
 		MockEnvironment environment = new MockEnvironment();
 		SystemEnvironmentPropertySource propertySource = new SystemEnvironmentPropertySource(
 				"override", Collections.singletonMap("foo.password", "test"));

spring-boot-project/spring-boot/src/test/kotlin/org/springframework/boot/SpringApplicationExtensionsTests.kt

@@ -70,10 +70,6 @@ class SpringApplicationExtensionsTests {
 		assertEquals(environment, context.environment)
 	}
 
-
-	@Configuration
-	internal open class ExampleConfig
-
 	@Configuration
 	internal open class ExampleWebConfig {