Add @EnabledOnLocale annotation for locale-based tests

Introduce @EnabledOnLocale annotation to enable or disable tests
based on the system's default locale.

See gh-46211

Signed-off-by: Dmytro Nosan <dimanosan@gmail.com>

spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/elasticsearch/ElasticsearchReactiveHealthIndicatorTests.java

@@ -33,6 +33,7 @@ import org.junit.jupiter.api.Test;
 import org.springframework.boot.actuate.data.elasticsearch.ElasticsearchReactiveHealthIndicator;
 import org.springframework.boot.actuate.health.Health;
 import org.springframework.boot.actuate.health.Status;
+import org.springframework.boot.testsupport.junit.EnabledOnLocale;
 import org.springframework.data.elasticsearch.client.elc.ReactiveElasticsearchClient;
 import org.springframework.http.HttpHeaders;
 import org.springframework.http.HttpStatus;
@@ -87,6 +88,7 @@ class ElasticsearchReactiveHealthIndicatorTests {
 	}
 
 	@Test
+	@EnabledOnLocale(language = "en")
 	void elasticsearchIsDown() throws Exception {
 		this.server.shutdown();
 		Health health = this.healthIndicator.health().block(TIMEOUT);

spring-boot-project/spring-boot-tools/spring-boot-maven-plugin/src/intTest/java/org/springframework/boot/maven/AotTests.java

@@ -26,6 +26,8 @@ import java.util.stream.Stream;
 import org.junit.jupiter.api.TestTemplate;
 import org.junit.jupiter.api.extension.ExtendWith;
 
+import org.springframework.boot.testsupport.junit.EnabledOnLocale;
+
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.assertj.core.api.Assertions.contentOf;
 
@@ -125,6 +127,7 @@ class AotTests {
 	}
 
 	@TestTemplate
+	@EnabledOnLocale(language = "en")
 	void whenAotRunsWithInvalidCompilerArgumentsCompileFails(MavenBuild mavenBuild) {
 		mavenBuild.project("aot-compiler-arguments")
 			.goals("package")

spring-boot-project/spring-boot-tools/spring-boot-test-support/src/main/java/org/springframework/boot/testsupport/junit/EnabledOnLocale.java

@@ -0,0 +1,43 @@
+/*
+ * Copyright 2012-present 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.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.boot.testsupport.junit;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+import org.junit.jupiter.api.extension.ExtendWith;
+
+/**
+ * {@code @EnabledOnLocale} annotation is used to conditionally enable a test method based
+ * on the specified locale attributes.
+ *
+ * @author Dmytro Nosan
+ */
+@Target({ ElementType.TYPE, ElementType.METHOD })
+@Retention(RetentionPolicy.RUNTIME)
+@ExtendWith(EnabledOnLocaleCondition.class)
+public @interface EnabledOnLocale {
+
+	/**
+	 * Specifies the language code for which the test method should be enabled.
+	 * @return the language code
+	 */
+	String language();
+
+}

spring-boot-project/spring-boot-tools/spring-boot-test-support/src/main/java/org/springframework/boot/testsupport/junit/EnabledOnLocaleCondition.java

@@ -0,0 +1,50 @@
+/*
+ * Copyright 2012-present 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.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.boot.testsupport.junit;
+
+import java.util.Locale;
+
+import org.junit.jupiter.api.extension.ConditionEvaluationResult;
+import org.junit.jupiter.api.extension.ExecutionCondition;
+import org.junit.jupiter.api.extension.ExtensionContext;
+import org.junit.platform.commons.support.AnnotationSupport;
+
+/**
+ * An implementation of {@link ExecutionCondition} that conditionally enables or disables
+ * the execution of a test method or class based on the specified locale attributes.
+ *
+ * @author Dmytro Nosan
+ */
+class EnabledOnLocaleCondition implements ExecutionCondition {
+
+	@Override
+	public ConditionEvaluationResult evaluateExecutionCondition(ExtensionContext context) {
+		return AnnotationSupport.findAnnotation(context.getElement(), EnabledOnLocale.class)
+			.map(this::evaluate)
+			.orElseGet(() -> ConditionEvaluationResult.enabled("No @EnabledOnLocale annotation found"));
+	}
+
+	private ConditionEvaluationResult evaluate(EnabledOnLocale annotation) {
+		Locale locale = Locale.getDefault();
+		String language = locale.getLanguage();
+		if (!annotation.language().equals(language)) {
+			return ConditionEvaluationResult.disabled("Disabled on language: " + language);
+		}
+		return ConditionEvaluationResult.enabled("Enabled on language: " + language);
+	}
+
+}

spring-boot-project/spring-boot/src/test/java/org/springframework/boot/web/embedded/tomcat/TomcatReactiveWebServerFactoryTests.java

@@ -38,6 +38,7 @@ import org.awaitility.Awaitility;
 import org.junit.jupiter.api.Test;
 import org.mockito.InOrder;
 
+import org.springframework.boot.testsupport.junit.EnabledOnLocale;
 import org.springframework.boot.web.reactive.server.AbstractReactiveWebServerFactory;
 import org.springframework.boot.web.reactive.server.AbstractReactiveWebServerFactoryTests;
 import org.springframework.boot.web.server.PortInUseException;
@@ -226,6 +227,7 @@ class TomcatReactiveWebServerFactoryTests extends AbstractReactiveWebServerFacto
 	}
 
 	@Test
+	@EnabledOnLocale(language = "en")
 	void portClashOfPrimaryConnectorResultsInPortInUseException() throws Exception {
 		doWithBlockedPort((port) -> assertThatExceptionOfType(RuntimeException.class).isThrownBy(() -> {
 			AbstractReactiveWebServerFactory factory = getFactory();

spring-boot-project/spring-boot/src/test/java/org/springframework/boot/web/embedded/tomcat/TomcatServletWebServerFactoryTests.java

@@ -83,6 +83,7 @@ import org.mockito.InOrder;
 
 import org.springframework.boot.ssl.DefaultSslBundleRegistry;
 import org.springframework.boot.testsupport.classpath.resources.WithPackageResources;
+import org.springframework.boot.testsupport.junit.EnabledOnLocale;
 import org.springframework.boot.testsupport.system.CapturedOutput;
 import org.springframework.boot.web.server.PortInUseException;
 import org.springframework.boot.web.server.Shutdown;
@@ -367,6 +368,7 @@ class TomcatServletWebServerFactoryTests extends AbstractServletWebServerFactory
 	}
 
 	@Test
+	@EnabledOnLocale(language = "en")
 	void startupFailureDoesNotResultInUnstoppedThreadsBeingReported(CapturedOutput output) throws Exception {
 		super.portClashOfPrimaryConnectorResultsInPortInUseException();
 		assertThat(output).doesNotContain("appears to have started a thread named [main]");

spring-boot-project/spring-boot/src/test/java/org/springframework/boot/web/servlet/server/AbstractServletWebServerFactoryTests.java

@@ -126,6 +126,7 @@ import org.springframework.boot.system.ApplicationHome;
 import org.springframework.boot.system.ApplicationTemp;
 import org.springframework.boot.testsupport.classpath.resources.ResourcePath;
 import org.springframework.boot.testsupport.classpath.resources.WithPackageResources;
+import org.springframework.boot.testsupport.junit.EnabledOnLocale;
 import org.springframework.boot.testsupport.system.CapturedOutput;
 import org.springframework.boot.testsupport.system.OutputCaptureExtension;
 import org.springframework.boot.testsupport.web.servlet.DirtiesUrlFactories;
@@ -1071,6 +1072,7 @@ public abstract class AbstractServletWebServerFactoryTests {
 	}
 
 	@Test
+	@EnabledOnLocale(language = "en")
 	protected void portClashOfPrimaryConnectorResultsInPortInUseException() throws Exception {
 		doWithBlockedPort((port) -> {
 			assertThatExceptionOfType(RuntimeException.class).isThrownBy(() -> {
@@ -1083,6 +1085,7 @@ public abstract class AbstractServletWebServerFactoryTests {
 	}
 
 	@Test
+	@EnabledOnLocale(language = "en")
 	protected void portClashOfSecondaryConnectorResultsInPortInUseException() throws Exception {
 		doWithBlockedPort((port) -> {
 			assertThatExceptionOfType(RuntimeException.class).isThrownBy(() -> {