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 }