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16 package org.apache.commons.math.stat.descriptive.summary;
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18 import junit.framework.Test;
19 import junit.framework.TestSuite;
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21 import org.apache.commons.math.stat.descriptive.StorelessUnivariateStatisticAbstractTest;
22 import org.apache.commons.math.stat.descriptive.UnivariateStatistic;
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28 public class ProductTest extends StorelessUnivariateStatisticAbstractTest{
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30 protected Product stat;
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35 public ProductTest(String name) {
36 super(name);
37 }
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39 public static Test suite() {
40 TestSuite suite = new TestSuite(ProductTest.class);
41 suite.setName("Product Tests");
42 return suite;
43 }
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48 public UnivariateStatistic getUnivariateStatistic() {
49 return new Product();
50 }
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52 public double getTolerance() {
53 return 10E8;
54 }
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59 public double expectedValue() {
60 return this.product;
61 }
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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 }