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Java > Open Source Codes > org > apache > commons > math > stat > descriptive > summary > SumSqTest


1 /*
2  * Copyright 2003-2004 The Apache Software Foundation.
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 package org.apache.commons.math.stat.descriptive.summary;
17
18 import junit.framework.Test;
19 import junit.framework.TestSuite;
20
21 import org.apache.commons.math.stat.descriptive.StorelessUnivariateStatisticAbstractTest;
22 import org.apache.commons.math.stat.descriptive.UnivariateStatistic;
23
24 /**
25  * Test cases for the {@link SumOfSquares} class.
26  *
27  * @version $Revision$ $Date: 2005-02-26 05:11:52 -0800 (Sat, 26 Feb 2005) $
28  */
29 public class SumSqTest extends StorelessUnivariateStatisticAbstractTest{
30
31     protected SumOfSquares stat;
32     
33     /**
34      * @param name
35      */
36     public SumSqTest(String JavaDoc name) {
37         super(name);
38     }
39
40     public static Test suite() {
41         TestSuite suite = new TestSuite(SumSqTest.class);
42         suite.setName("SumSq Tests");
43         return suite;
44     }
45     
46     /* (non-Javadoc)
47      * @see org.apache.commons.math.stat.descriptive.UnivariateStatisticAbstractTest#getUnivariateStatistic()
48      */
49     public UnivariateStatistic getUnivariateStatistic() {
50         return new SumOfSquares();
51     }
52
53     /* (non-Javadoc)
54      * @see org.apache.commons.math.stat.descriptive.UnivariateStatisticAbstractTest#expectedValue()
55      */
56     public double expectedValue() {
57         return this.sumSq;
58     }
59     
60     public void testSpecialValues() {
61         SumOfSquares sumSq = new SumOfSquares();
62         assertTrue(Double.isNaN(sumSq.getResult()));
63         sumSq.increment(2d);
64         assertEquals(4d, sumSq.getResult(), 0);
65         sumSq.increment(Double.POSITIVE_INFINITY);
66         assertEquals(Double.POSITIVE_INFINITY, sumSq.getResult(), 0);
67         sumSq.increment(Double.NEGATIVE_INFINITY);
68         assertEquals(Double.POSITIVE_INFINITY, sumSq.getResult(), 0);
69         sumSq.increment(Double.NaN);
70         assertTrue(Double.isNaN(sumSq.getResult()));
71         sumSq.increment(1);
72         assertTrue(Double.isNaN(sumSq.getResult()));
73     }
74
75 }
76
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