Fix modular setup

Author: sormuras

junit-jupiter-api/src/main/java/module-info.java

@@ -29,12 +29,10 @@
 	exports org.junit.jupiter.api.extension.support;
 	exports org.junit.jupiter.api.function;
 	exports org.junit.jupiter.api.io;
+	exports org.junit.jupiter.api.locale;
 	exports org.junit.jupiter.api.parallel;
 	exports org.junit.jupiter.api.timeout to org.junit.jupiter.engine;
-	exports org.junit.jupiter.api.locale to org.junit.platform.engine;
-	exports org.junit.jupiter.api.timezone to org.junit.platform.engine;
+	exports org.junit.jupiter.api.timezone;
 
 	opens org.junit.jupiter.api.condition to org.junit.platform.commons;
-	opens org.junit.jupiter.api.locale to org.junit.platform.commons;
-	opens org.junit.jupiter.api.timezone to org.junit.platform.commons;
 }

junit-jupiter-api/src/main/java/org/junit/jupiter/api/locale/DefaultLocaleExtension.java

@@ -10,9 +10,12 @@
 
 package org.junit.jupiter.api.locale;
 
+import static org.apiguardian.api.API.Status.EXPERIMENTAL;
+
 import java.util.Locale;
 import java.util.Optional;
 
+import org.apiguardian.api.API;
 import org.junit.jupiter.api.extension.AfterEachCallback;
 import org.junit.jupiter.api.extension.BeforeAllCallback;
 import org.junit.jupiter.api.extension.BeforeEachCallback;
@@ -23,16 +26,17 @@
 import org.junit.platform.commons.support.AnnotationSupport;
 import org.junit.platform.commons.support.ReflectionSupport;
 
-/**
- * @since 6.1
- */
-class DefaultLocaleExtension implements BeforeAllCallback, BeforeEachCallback, AfterEachCallback {
+@API(status = EXPERIMENTAL, since = "6.1")
+public final class DefaultLocaleExtension implements BeforeAllCallback, BeforeEachCallback, AfterEachCallback {
 
 	private static final Namespace NAMESPACE = Namespace.create(DefaultLocaleExtension.class);
 
 	private static final String CUSTOM_KEY = "CustomLocale";
 	private static final String DEFAULT_KEY = "DefaultLocale";
 
+	public DefaultLocaleExtension() {
+	}
+
 	@Override
 	public void beforeAll(ExtensionContext context) throws Exception {
 		createLocaleFromAnnotation(context) //

junit-jupiter-api/src/main/java/org/junit/jupiter/api/timezone/DefaultTimeZoneExtension.java

@@ -10,9 +10,12 @@
 
 package org.junit.jupiter.api.timezone;
 
+import static org.apiguardian.api.API.Status.EXPERIMENTAL;
+
 import java.util.Optional;
 import java.util.TimeZone;
 
+import org.apiguardian.api.API;
 import org.junit.jupiter.api.extension.AfterEachCallback;
 import org.junit.jupiter.api.extension.BeforeAllCallback;
 import org.junit.jupiter.api.extension.BeforeEachCallback;
@@ -23,13 +26,17 @@
 import org.junit.platform.commons.support.AnnotationSupport;
 import org.junit.platform.commons.support.ReflectionSupport;
 
-class DefaultTimeZoneExtension implements BeforeAllCallback, BeforeEachCallback, AfterEachCallback {
+@API(status = EXPERIMENTAL, since = "6.1")
+public final class DefaultTimeZoneExtension implements BeforeAllCallback, BeforeEachCallback, AfterEachCallback {
 
 	private static final Namespace NAMESPACE = Namespace.create(DefaultTimeZoneExtension.class);
 
 	private static final String CUSTOM_KEY = "CustomTimeZone";
 	private static final String DEFAULT_KEY = "DefaultTimeZone";
 
+	public DefaultTimeZoneExtension() {
+	}
+
 	@Override
 	public void beforeAll(ExtensionContext context) throws Exception {
 		createTimeZoneFromAnnotation(context) //

platform-tooling-support-tests/projects/jar-describe-module/junit-jupiter-api.expected.txt

@@ -5,7 +5,9 @@ exports org.junit.jupiter.api.extension
 exports org.junit.jupiter.api.extension.support
 exports org.junit.jupiter.api.function
 exports org.junit.jupiter.api.io
+exports org.junit.jupiter.api.locale
 exports org.junit.jupiter.api.parallel
+exports org.junit.jupiter.api.timezone
 requires java.base mandated
 requires kotlin.stdlib static
 requires org.apiguardian.api static transitive