UnmodifiableIteratorTest.java revision 7dd252788645e940eada959bdde927426e2531c9 
1/*
2 * Copyright (C) 2008 The Guava Authors
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.google.common.collect;
18
19import com.google.common.annotations.GwtCompatible;
20
21import java.util.Iterator;
22import java.util.NoSuchElementException;
23
24import junit.framework.TestCase;
25
26/**
27 * Tests for {@link UnmodifiableIterator}.
28 *
29 * @author Jared Levy
30 */
31@GwtCompatible
32public class UnmodifiableIteratorTest extends TestCase {
33
34  public void testRemove() {
35    final String[] array = {"a", "b", "c"};
36
37    Iterator<String> iterator = new UnmodifiableIterator<String>() {
38      int i;
39      @Override
40      public boolean hasNext() {
41        return i < array.length;
42      }
43      @Override
44      public String next() {
45        if (!hasNext()) {
46          throw new NoSuchElementException();
47        }
48        return array[i++];
49      }
50    };
51
52    assertTrue(iterator.hasNext());
53    assertEquals("a", iterator.next());
54    try {
55      iterator.remove();
56      fail();
57    } catch (UnsupportedOperationException expected) {}
58  }
59}
60