8301767: Convert virtual thread tests to JUnit

test/jdk/java/lang/Thread/BuilderTest.java

@@ -291,7 +291,7 @@ void testPriority2() {
     @Test
     void testPriority3() {
         Thread currentThread = Thread.currentThread();
-        assumeFalse(currentThread.isVirtual(), "Main test is a virtual thread");
+        assumeFalse(currentThread.isVirtual(), "Main thread is a virtual thread");
 
         int maxPriority = currentThread.getThreadGroup().getMaxPriority();
         int priority = Math.min(maxPriority + 1, Thread.MAX_PRIORITY);

test/jdk/java/lang/Thread/UncaughtExceptionsTest.java

@@ -26,8 +26,6 @@
 import jdk.test.lib.process.OutputAnalyzer;
 import jdk.test.lib.process.ProcessTools;
 import org.junit.jupiter.api.Test;
-import org.junit.jupiter.api.BeforeAll;
-import org.junit.jupiter.api.AfterAll;
 import org.junit.jupiter.params.ParameterizedTest;
 import org.junit.jupiter.params.provider.MethodSource;
 import org.junit.jupiter.params.provider.Arguments;

test/jdk/java/lang/Thread/virtual/CustomScheduler.java

@@ -162,7 +162,7 @@ void testBadCarrier() {
     @Test
     void testParkWithInterruptSet() {
         Thread carrier = Thread.currentThread();
-        assumeFalse(carrier.isVirtual(), "Main test is a virtual thread");
+        assumeFalse(carrier.isVirtual(), "Main thread is a virtual thread");
         try {
             var builder = ThreadBuilders.virtualThreadBuilder(Runnable::run);
             Thread vthread = builder.start(() -> {
@@ -183,7 +183,7 @@ void testParkWithInterruptSet() {
     @Test
     void testTerminateWithInterruptSet() {
         Thread carrier = Thread.currentThread();
-        assumeFalse(carrier.isVirtual(), "Main test is a virtual thread");
+        assumeFalse(carrier.isVirtual(), "Main thread is a virtual thread");
         try {
             var builder = ThreadBuilders.virtualThreadBuilder(Runnable::run);
             Thread vthread = builder.start(() -> {
@@ -201,7 +201,7 @@ void testTerminateWithInterruptSet() {
      */
     @Test
     void testRunWithInterruptSet() throws Exception {
-        assumeFalse(Thread.currentThread().isVirtual(), "Main test is a virtual thread");
+        assumeFalse(Thread.currentThread().isVirtual(), "Main thread is a virtual thread");
         Executor scheduler = (task) -> {
             Thread.currentThread().interrupt();
             task.run();