test/jdk/java/util/Collections/SingletonIterator.java

*** 1,7 ***
  /*
!  * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.
--- 1,7 ---
  /*
!  * Copyright (c) 2016, 2026, Oracle and/or its affiliates. All rights reserved.
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.

*** 22,13 ***
--- 22,15 ---
   */
  
  /*
   * @test
   * @bug 8024500 8166446
+  * @library /test/lib
   * @run testng SingletonIterator
   */
  
+ import jdk.test.lib.valueclass.VClass;
  import java.util.Collections;
  import java.util.Iterator;
  import java.util.NoSuchElementException;
  import java.util.concurrent.atomic.AtomicInteger;
  import org.testng.annotations.Test;

*** 61,10 ***
--- 63,22 ---
          assertIteratorExhausted(it);
      }
  
      static class SingletonException extends RuntimeException { }
  
+     @Test
+     public void testValueSingletonIterator() {
+         Iterator<VClass> it = Collections.singleton(new VClass(42, new int[] { 42 })).iterator();
+         AtomicInteger cnt = new AtomicInteger(0);
+         it.forEachRemaining(v -> {
+             if (!v.equals(new VClass(42, new int[] { 42 }))) throw new RuntimeException("wrong value");
+             cnt.incrementAndGet();
+         });
+         assertEquals(cnt.get(), 1);
+         assertIteratorExhausted(it);
+     }
+ 
      public void testThrowFromForEachRemaining() {
          Iterator<String> it = Collections.singleton("TheOne").iterator();
  
          try {
              it.forEachRemaining(s -> { throw new SingletonException(); });