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 }