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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 java.util.Arrays;
28  import java.util.Random;
29  
30  import junit.framework.TestCase;
31  
32  /**
33   * Test that our BubbleSort algorithm is correctly implemented.
34   * 
35   * @author Ceki
36   *
37   */
38  public class BubbleSortTest extends TestCase {
39  
40      public void testSmoke() {
41          int[] a = new int[] { 5, 3, 2, 7 };
42          BubbleSort.sort(a);
43          int i = 0;
44          assertEquals(2, a[i++]);
45          assertEquals(3, a[i++]);
46          assertEquals(5, a[i++]);
47          assertEquals(7, a[i++]);
48      }
49  
50      public void testEmpty() {
51          int[] a = new int[] {};
52          BubbleSort.sort(a);
53      }
54  
55      public void testSorted() {
56          int[] a = new int[] { 3, 30, 300, 3000 };
57          BubbleSort.sort(a);
58          int i = 0;
59          assertEquals(3, a[i++]);
60          assertEquals(30, a[i++]);
61          assertEquals(300, a[i++]);
62          assertEquals(3000, a[i++]);
63      }
64  
65      public void testInverted() {
66          int[] a = new int[] { 3000, 300, 30, 3 };
67          BubbleSort.sort(a);
68          int i = 0;
69          assertEquals(3, a[i++]);
70          assertEquals(30, a[i++]);
71          assertEquals(300, a[i++]);
72          assertEquals(3000, a[i++]);
73      }
74  
75      public void testWithSameEntry() {
76          int[] a = new int[] { 10, 20, 10, 20 };
77          BubbleSort.sort(a);
78          int i = 0;
79          assertEquals(10, a[i++]);
80          assertEquals(10, a[i++]);
81          assertEquals(20, a[i++]);
82          assertEquals(20, a[i++]);
83      }
84  
85      public void testRandom() {
86          int len = 100;
87          Random random = new Random(156);
88          int[] a = new int[len];
89          int[] witness = new int[len];
90          for (int i = 0; i < len; i++) {
91              int r = random.nextInt();
92              a[i] = r;
93              witness[i] = r;
94          }
95          BubbleSort.sort(a);
96          Arrays.sort(witness);
97          assertTrue(Arrays.equals(witness, a));
98      }
99  
100 }