1 /**
2 * Copyright (c) 2004-2011 QOS.ch
3 * All rights reserved.
4 *
5 * Permission is hereby granted, free of charge, to any person obtaining
6 * a copy of this software and associated documentation files (the
7 * "Software"), to deal in the Software without restriction, including
8 * without limitation the rights to use, copy, modify, merge, publish,
9 * distribute, sublicense, and/or sell copies of the Software, and to
10 * permit persons to whom the Software is furnished to do so, subject to
11 * the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be
14 * included in all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
17 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
18 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
19 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
20 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
21 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
22 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
23 *
24 */
25 package org.slf4j.helpers;
26
27 import static org.junit.Assert.assertEquals;
28 import static org.junit.Assert.assertTrue;
29
30 import java.util.Arrays;
31 import java.util.Random;
32
33 import org.junit.Test;
34
35 /**
36 * Test that our BubbleSort algorithm is correctly implemented.
37 *
38 * @author Ceki
39 *
40 */
41 public class BubbleSortTest {
42
43 @Test
44 public void testSmoke() {
45 int[] a = new int[] { 5, 3, 2, 7 };
46 BubbleSort.sort(a);
47 int i = 0;
48 assertEquals(2, a[i++]);
49 assertEquals(3, a[i++]);
50 assertEquals(5, a[i++]);
51 assertEquals(7, a[i++]);
52 }
53
54 @Test
55 public void testEmpty() {
56 int[] a = new int[] {};
57 BubbleSort.sort(a);
58 }
59
60 @Test
61 public void testSorted() {
62 int[] a = new int[] { 3, 30, 300, 3000 };
63 BubbleSort.sort(a);
64 int i = 0;
65 assertEquals(3, a[i++]);
66 assertEquals(30, a[i++]);
67 assertEquals(300, a[i++]);
68 assertEquals(3000, a[i++]);
69 }
70
71 @Test
72 public void testInverted() {
73 int[] a = new int[] { 3000, 300, 30, 3 };
74 BubbleSort.sort(a);
75 int i = 0;
76 assertEquals(3, a[i++]);
77 assertEquals(30, a[i++]);
78 assertEquals(300, a[i++]);
79 assertEquals(3000, a[i++]);
80 }
81
82 @Test
83 public void testWithSameEntry() {
84 int[] a = new int[] { 10, 20, 10, 20 };
85 BubbleSort.sort(a);
86 int i = 0;
87 assertEquals(10, a[i++]);
88 assertEquals(10, a[i++]);
89 assertEquals(20, a[i++]);
90 assertEquals(20, a[i++]);
91 }
92
93 @Test
94 public void testRandom() {
95 int len = 100;
96 Random random = new Random(156);
97 int[] a = new int[len];
98 int[] witness = new int[len];
99 for (int i = 0; i < len; i++) {
100 int r = random.nextInt();
101 a[i] = r;
102 witness[i] = r;
103 }
104 BubbleSort.sort(a);
105 Arrays.sort(witness);
106 assertTrue(Arrays.equals(witness, a));
107 }
108
109 }