AtomicsTest.java revision 7dd252788645e940eada959bdde927426e2531c9 
1/*
2 * Copyright (C) 2010 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.util.concurrent;
18
19import com.google.common.testing.NullPointerTester;
20
21import java.util.concurrent.atomic.AtomicReferenceArray;
22
23import junit.framework.TestCase;
24
25/**
26 * Unit test for {@link Atomics}.
27 *
28 * @author Kurt Alfred Kluever
29 */
30public class AtomicsTest extends TestCase {
31
32  private static final Object OBJECT = new Object();
33
34  public void testNewReference() throws Exception {
35    assertEquals(null, Atomics.newReference().get());
36  }
37
38  public void testNewReference_withInitialValue() throws Exception {
39    assertEquals(null, Atomics.newReference(null).get());
40    assertEquals(OBJECT, Atomics.newReference(OBJECT).get());
41  }
42
43  public void testNewReferenceArray_withLength() throws Exception {
44    int length = 42;
45    AtomicReferenceArray<String> refArray = Atomics.newReferenceArray(length);
46    for (int i = 0; i < length; ++i) {
47      assertEquals(null, refArray.get(i));
48    }
49    try {
50      refArray.get(length);
51      fail();
52    } catch (IndexOutOfBoundsException expected) {
53    }
54  }
55
56  public void testNewReferenceArray_withNegativeLength() throws Exception {
57    try {
58      Atomics.newReferenceArray(-1);
59      fail();
60    } catch (NegativeArraySizeException expected) {
61    }
62  }
63
64  public void testNewReferenceArray_withStringArray() throws Exception {
65    String[] array = {"foo", "bar", "baz"};
66    AtomicReferenceArray<String> refArray = Atomics.newReferenceArray(array);
67    for (int i = 0; i < array.length; ++i) {
68      assertEquals(array[i], refArray.get(i));
69    }
70    try {
71      refArray.get(array.length);
72      fail();
73    } catch (IndexOutOfBoundsException expected) {
74    }
75  }
76
77  public void testNewReferenceArray_withNullArray() throws Exception {
78    try {
79      Atomics.newReferenceArray(null);
80      fail();
81    } catch (NullPointerException expected) {
82    }
83  }
84
85  public void testNullPointers() {
86    NullPointerTester tester = new NullPointerTester();
87    tester.testAllPublicConstructors(Atomics.class); // there aren't any
88    tester.testAllPublicStaticMethods(Atomics.class);
89  }
90}
91