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Java > Open Source Codes > org > jfree > data > statistics > junit > SimpleHistogramDatasetTests


1 /* ===========================================================
2  * JFreeChart : a free chart library for the Java(tm) platform
3  * ===========================================================
4  *
5  * (C) Copyright 2000-2005, by Object Refinery Limited and Contributors.
6  *
7  * Project Info: http://www.jfree.org/jfreechart/index.html
8  *
9  * This library is free software; you can redistribute it and/or modify it
10  * under the terms of the GNU Lesser General Public License as published by
11  * the Free Software Foundation; either version 2.1 of the License, or
12  * (at your option) any later version.
13  *
14  * This library is distributed in the hope that it will be useful, but
15  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
16  * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
17  * License for more details.
18  *
19  * You should have received a copy of the GNU Lesser General Public
20  * License along with this library; if not, write to the Free Software
21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
22  * USA.
23  *
24  * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
25  * in the United States and other countries.]
26  *
27  * --------------------------------
28  * SimpleHistogramDatasetTests.java
29  * --------------------------------
30  * (C) Copyright 2005 by Object Refinery Limited and Contributors.
31  *
32  * Original Author: David Gilbert (for Object Refinery Limited);
33  * Contributor(s): -;
34  *
35  * $Id: SimpleHistogramDatasetTests.java,v 1.1.2.1 2006/10/03 15:41:42 mungady Exp $
36  *
37  * Changes
38  * -------
39  * 10-Jan-2005 : Version 1 (DG);
40  *
41  */
42
43 package org.jfree.data.statistics.junit;
44
45 import java.io.ByteArrayInputStream JavaDoc;
46 import java.io.ByteArrayOutputStream JavaDoc;
47 import java.io.ObjectInput JavaDoc;
48 import java.io.ObjectInputStream JavaDoc;
49 import java.io.ObjectOutput JavaDoc;
50 import java.io.ObjectOutputStream JavaDoc;
51
52 import junit.framework.Test;
53 import junit.framework.TestCase;
54 import junit.framework.TestSuite;
55
56 import org.jfree.data.statistics.SimpleHistogramBin;
57 import org.jfree.data.statistics.SimpleHistogramDataset;
58
59 /**
60  * Tests for the {@link SimpleHistogramDataset} class.
61  */
62 public class SimpleHistogramDatasetTests extends TestCase {
63
64     /**
65      * Returns the tests as a test suite.
66      *
67      * @return The test suite.
68      */
69     public static Test suite() {
70         return new TestSuite(SimpleHistogramDatasetTests.class);
71     }
72
73     /**
74      * Constructs a new set of tests.
75      *
76      * @param name the name of the tests.
77      */
78     public SimpleHistogramDatasetTests(String JavaDoc name) {
79         super(name);
80     }
81
82     /**
83      * Ensure that the equals() method can distinguish all fields.
84      */
85     public void testEquals() {
86         SimpleHistogramDataset d1 = new SimpleHistogramDataset("Dataset 1");
87         SimpleHistogramDataset d2 = new SimpleHistogramDataset("Dataset 1");
88         assertTrue(d1.equals(d2));
89         
90         d1.addBin(new SimpleHistogramBin(1.0, 2.0));
91         assertFalse(d1.equals(d2));
92         d2.addBin(new SimpleHistogramBin(1.0, 2.0));
93         assertTrue(d1.equals(d2));
94     }
95     
96     /**
97      * Some checks for the clone() method.
98      */
99     public void testCloning() {
100         SimpleHistogramDataset d1 = new SimpleHistogramDataset("Dataset 1");
101         SimpleHistogramDataset d2 = null;
102         try {
103             d2 = (SimpleHistogramDataset) d1.clone();
104         }
105         catch (CloneNotSupportedException JavaDoc e) {
106             System.err.println("Failed to clone.");
107         }
108         assertTrue(d1 != d2);
109         assertTrue(d1.getClass() == d2.getClass());
110         assertTrue(d1.equals(d2));
111         
112         // check that clone is independent of the original
113 d2.addBin(new SimpleHistogramBin(2.0, 3.0));
114         d2.addObservation(2.3);
115         assertFalse(d1.equals(d2));
116     }
117     
118     /**
119      * Serialize an instance, restore it, and check for equality.
120      */
121     public void testSerialization() {
122
123         SimpleHistogramDataset d1 = new SimpleHistogramDataset("D1");
124         SimpleHistogramDataset d2 = null;
125         try {
126             ByteArrayOutputStream JavaDoc buffer = new ByteArrayOutputStream JavaDoc();
127             ObjectOutput JavaDoc out = new ObjectOutputStream JavaDoc(buffer);
128             out.writeObject(d1);
129             out.close();
130             ObjectInput JavaDoc in = new ObjectInputStream JavaDoc(
131                 new ByteArrayInputStream JavaDoc(buffer.toByteArray())
132             );
133             d2 = (SimpleHistogramDataset) in.readObject();
134             in.close();
135         }
136         catch (Exception JavaDoc e) {
137             System.out.println(e.toString());
138         }
139         assertEquals(d1, d2);
140     }
141
142 }
143
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