1/*
2 * Copyright (C) 2009 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.testing;
18
19import com.google.common.annotations.GwtCompatible;
20
21import junit.framework.TestCase;
22
23import java.util.Collections;
24import java.util.Iterator;
25import java.util.NoSuchElementException;
26
27/**
28 * Unit test for {@link MinimalIterable}.
29 *
30 * @author Kevin Bourrillion
31 */
32@GwtCompatible
33public class MinimalIterableTest extends TestCase {
34
35  public void testOf_empty() {
36    Iterable<String> iterable = MinimalIterable.<String>of();
37    Iterator<String> iterator = iterable.iterator();
38    assertFalse(iterator.hasNext());
39    try {
40      iterator.next();
41      fail();
42    } catch (NoSuchElementException expected) {
43    }
44    try {
45      iterable.iterator();
46      fail();
47    } catch (IllegalStateException expected) {
48    }
49  }
50
51  public void testOf_one() {
52    Iterable<String> iterable = MinimalIterable.of("a");
53    Iterator<String> iterator = iterable.iterator();
54    assertTrue(iterator.hasNext());
55    assertEquals("a", iterator.next());
56    assertFalse(iterator.hasNext());
57    try {
58      iterator.next();
59      fail();
60    } catch (NoSuchElementException expected) {
61    }
62    try {
63      iterable.iterator();
64      fail();
65    } catch (IllegalStateException expected) {
66    }
67  }
68
69  public void testFrom_empty() {
70    Iterable<String> iterable
71        = MinimalIterable.from(Collections.<String>emptySet());
72    Iterator<String> iterator = iterable.iterator();
73    assertFalse(iterator.hasNext());
74    try {
75      iterator.next();
76      fail();
77    } catch (NoSuchElementException expected) {
78    }
79    try {
80      iterable.iterator();
81      fail();
82    } catch (IllegalStateException expected) {
83    }
84  }
85
86  public void testFrom_one() {
87    Iterable<String> iterable
88        = MinimalIterable.from(Collections.singleton("a"));
89    Iterator<String> iterator = iterable.iterator();
90    assertTrue(iterator.hasNext());
91    assertEquals("a", iterator.next());
92    try {
93      iterator.remove();
94      fail();
95    } catch (UnsupportedOperationException expected) {
96    }
97    assertFalse(iterator.hasNext());
98    try {
99      iterator.next();
100      fail();
101    } catch (NoSuchElementException expected) {
102    }
103    try {
104      iterable.iterator();
105      fail();
106    } catch (IllegalStateException expected) {
107    }
108  }
109}
110