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16 package org.apache.commons.math.stat.descriptive.moment;
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: 155427 $ $Date: 2005-02-26 06:11:52 -0700 (Sat, 26 Feb 2005) $
27 */
28 public class GeometricMeanTest extends StorelessUnivariateStatisticAbstractTest{
29
30 protected GeometricMean stat;
31
32 /**
33 * @param name
34 */
35 public GeometricMeanTest(String name) {
36 super(name);
37 }
38
39 public static Test suite() {
40 TestSuite suite = new TestSuite(GeometricMeanTest.class);
41 suite.setName("Mean Tests");
42 return suite;
43 }
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48 public UnivariateStatistic getUnivariateStatistic() {
49 return new GeometricMean();
50 }
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52
53
54
55 public double expectedValue() {
56 return this.geoMean;
57 }
58
59 public void testSpecialValues() {
60 GeometricMean mean = new GeometricMean();
61
62 assertTrue(Double.isNaN(mean.getResult()));
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65 mean.increment(1d);
66 assertFalse(Double.isNaN(mean.getResult()));
67
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69 mean.increment(0d);
70 assertEquals(0d, mean.getResult(), 0);
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73 mean.increment(Double.POSITIVE_INFINITY);
74 assertTrue(Double.isNaN(mean.getResult()));
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77 mean.clear();
78 assertTrue(Double.isNaN(mean.getResult()));
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81 mean.increment(Double.POSITIVE_INFINITY);
82 assertEquals(Double.POSITIVE_INFINITY, mean.getResult(), 0);
83
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85 mean.increment(-2d);
86 assertTrue(Double.isNaN(mean.getResult()));
87 }
88
89 }