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17 package org.apache.commons.math.stat.descriptive.summary;
18
19 import junit.framework.Test;
20 import junit.framework.TestSuite;
21
22 import org.apache.commons.math.stat.descriptive.StorelessUnivariateStatisticAbstractTest;
23 import org.apache.commons.math.stat.descriptive.UnivariateStatistic;
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29 public class ProductTest extends StorelessUnivariateStatisticAbstractTest{
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31 protected Product stat;
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36 public ProductTest(String name) {
37 super(name);
38 }
39
40 public static Test suite() {
41 TestSuite suite = new TestSuite(ProductTest.class);
42 suite.setName("Product Tests");
43 return suite;
44 }
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49 @Override
50 public UnivariateStatistic getUnivariateStatistic() {
51 return new Product();
52 }
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57 @Override
58 public double getTolerance() {
59 return 10E8;
60 }
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65 @Override
66 public double expectedValue() {
67 return this.product;
68 }
69
70 public void testSpecialValues() {
71 Product product = new Product();
72 assertTrue(Double.isNaN(product.getResult()));
73 product.increment(1);
74 assertEquals(1, product.getResult(), 0);
75 product.increment(Double.POSITIVE_INFINITY);
76 assertEquals(Double.POSITIVE_INFINITY, product.getResult(), 0);
77 product.increment(Double.NEGATIVE_INFINITY);
78 assertEquals(Double.NEGATIVE_INFINITY, product.getResult(), 0);
79 product.increment(Double.NaN);
80 assertTrue(Double.isNaN(product.getResult()));
81 product.increment(1);
82 assertTrue(Double.isNaN(product.getResult()));
83 }
84
85 }