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


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 UnivariateStatistic} class.
26  * @version $Revision$ $Date: 2005-02-26 05:11:52 -0800 (Sat, 26 Feb 2005) $
27  */
28 public class ProductTest extends StorelessUnivariateStatisticAbstractTest{
29
30     protected Product stat;
31     
32     /**
33      * @param name
34      */
35     public ProductTest(String JavaDoc name) {
36         super(name);
37     }
38
39     public static Test suite() {
40         TestSuite suite = new TestSuite(ProductTest.class);
41         suite.setName("Product Tests");
42         return suite;
43     }
44     
45     /* (non-Javadoc)
46      * @see org.apache.commons.math.stat.descriptive.UnivariateStatisticAbstractTest#getUnivariateStatistic()
47      */
48     public UnivariateStatistic getUnivariateStatistic() {
49         return new Product();
50     }
51
52     public double getTolerance() {
53         return 10E8; //sic -- big absolute error due to only 15 digits of accuracy in double
54 }
55     
56     /* (non-Javadoc)
57      * @see org.apache.commons.math.stat.descriptive.UnivariateStatisticAbstractTest#expectedValue()
58      */
59     public double expectedValue() {
60         return this.product;
61     }
62     
63     public void testSpecialValues() {
64         Product product = new Product();
65         assertTrue(Double.isNaN(product.getResult()));
66         product.increment(1);
67         assertEquals(1, product.getResult(), 0);
68         product.increment(Double.POSITIVE_INFINITY);
69         assertEquals(Double.POSITIVE_INFINITY, product.getResult(), 0);
70         product.increment(Double.NEGATIVE_INFINITY);
71         assertEquals(Double.NEGATIVE_INFINITY, product.getResult(), 0);
72         product.increment(Double.NaN);
73         assertTrue(Double.isNaN(product.getResult()));
74         product.increment(1);
75         assertTrue(Double.isNaN(product.getResult()));
76     }
77
78 }
79
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