Allow to specify a reason for @isolated

Author: marcphilipp

junit-jupiter-api/src/main/java/org/junit/jupiter/api/parallel/Isolated.java

@@ -39,4 +39,10 @@
 @Inherited
 @ResourceLock("org.junit.platform.engine.support.hierarchical.ExclusiveResource.GLOBAL_KEY")
 public @interface Isolated {
+
+	/**
+	 * The reason this test class needs to run in isolation.
+	 */
+	String value() default "";
+
 }

platform-tests/src/test/java/org/junit/platform/engine/support/hierarchical/ParallelExecutionIntegrationTests.java

@@ -244,7 +244,7 @@ void canRunTestsIsolatedFromEachOtherAcrossClasses() {
 		assertThat(events.stream().filter(event(test(), finishedWithFailure())::matches)).isEmpty();
 	}
 
-	@Isolated
+	@Isolated("testing")
 	static class IsolatedTestCase {
 		static AtomicInteger sharedResource;
 		static CountDownLatch countDownLatch;