1/*
2 * Copyright (C) 2006 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.base;
18
19import com.google.common.annotations.GwtCompatible;
20import com.google.common.annotations.GwtIncompatible;
21import com.google.common.testing.NullPointerTester;
22
23import junit.framework.TestCase;
24
25/**
26 * Tests for {@link Objects}.
27 *
28 * @author Laurence Gonsalves
29 */
30@GwtCompatible(emulated = true)
31public class ObjectsTest extends TestCase {
32  public void testEqual() throws Exception {
33    assertTrue(Objects.equal(1, 1));
34    assertTrue(Objects.equal(null, null));
35
36    // test distinct string objects
37    String s1 = "foobar";
38    String s2 = new String(s1);
39    assertTrue(Objects.equal(s1, s2));
40
41    assertFalse(Objects.equal(s1, null));
42    assertFalse(Objects.equal(null, s1));
43    assertFalse(Objects.equal("foo", "bar"));
44    assertFalse(Objects.equal("1", 1));
45  }
46
47  public void testHashCode() throws Exception {
48    int h1 = Objects.hashCode(1, "two", 3.0);
49    int h2 = Objects.hashCode(new Integer(1), new String("two"),
50                              new Double(3.0));
51    // repeatable
52    assertEquals(h1, h2);
53
54    // These don't strictly need to be true, but they're nice properties.
55    assertTrue(Objects.hashCode(1, 2, null) != Objects.hashCode(1, 2));
56    assertTrue(Objects.hashCode(1, 2, null) != Objects.hashCode(1, null, 2));
57    assertTrue(Objects.hashCode(1, null, 2) != Objects.hashCode(1, 2));
58    assertTrue(Objects.hashCode(1, 2, 3) != Objects.hashCode(3, 2, 1));
59    assertTrue(Objects.hashCode(1, 2, 3) != Objects.hashCode(2, 3, 1));
60  }
61
62  public void testFirstNonNull_withNonNull() throws Exception {
63    String s1 = "foo";
64    String s2 = Objects.firstNonNull(s1, "bar");
65    assertSame(s1, s2);
66
67    Long n1 = new Long(42);
68    Long n2 = Objects.firstNonNull(null, n1);
69    assertSame(n1, n2);
70  }
71
72  public void testFirstNonNull_throwsNullPointerException() throws Exception {
73    try {
74      Objects.firstNonNull(null, null);
75      fail("expected NullPointerException");
76    } catch (NullPointerException expected) {
77    }
78  }
79
80  @GwtIncompatible("NullPointerTester")
81  public void testNullPointers() throws Exception {
82    NullPointerTester tester = new NullPointerTester();
83    tester.testAllPublicStaticMethods(Objects.class);
84  }
85}
86