1 /*
   2  * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 /*
  25  * @test
  26  * @run testng SingletonIterator
  27  */
  28 
  29 import java.util.Collections;
  30 import java.util.Iterator;
  31 import java.util.NoSuchElementException;
  32 import java.util.concurrent.atomic.AtomicInteger;
  33 import org.testng.annotations.Test;
  34 
  35 import static org.testng.Assert.assertEquals;
  36 import static org.testng.Assert.assertFalse;
  37 import static org.testng.Assert.fail;
  38 
  39 @Test(groups = "unit")
  40 public class SingletonIterator {
  41         public void testForEachRemaining() {
  42                 Iterator<String> it = Collections.singleton("TheOne").iterator();
  43         AtomicInteger cnt = new AtomicInteger(0);
  44 
  45         it.forEachRemaining(s -> {
  46             assertEquals("TheOne", s);
  47             cnt.incrementAndGet();
  48         });
  49 
  50         assertEquals(cnt.get(), 1);
  51         assertFalse(it.hasNext());
  52 
  53         try {
  54             String str = it.next();
  55             fail("Should throw NoSuchElementException at end");
  56         } catch (NoSuchElementException ex) {
  57             // ignore;
  58         }
  59         }
  60 }