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17 package org.apache.commons.math.stat.descriptive.summary;
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19 import junit.framework.Test;
20 import junit.framework.TestSuite;
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22 import org.apache.commons.math.stat.descriptive.StorelessUnivariateStatisticAbstractTest;
23 import org.apache.commons.math.stat.descriptive.UnivariateStatistic;
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30 public class SumSqTest extends StorelessUnivariateStatisticAbstractTest{
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32 protected SumOfSquares stat;
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37 public SumSqTest(String name) {
38 super(name);
39 }
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41 public static Test suite() {
42 TestSuite suite = new TestSuite(SumSqTest.class);
43 suite.setName("SumSq Tests");
44 return suite;
45 }
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50 @Override
51 public UnivariateStatistic getUnivariateStatistic() {
52 return new SumOfSquares();
53 }
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58 @Override
59 public double expectedValue() {
60 return this.sumSq;
61 }
62
63 public void testSpecialValues() {
64 SumOfSquares sumSq = new SumOfSquares();
65 assertTrue(Double.isNaN(sumSq.getResult()));
66 sumSq.increment(2d);
67 assertEquals(4d, sumSq.getResult(), 0);
68 sumSq.increment(Double.POSITIVE_INFINITY);
69 assertEquals(Double.POSITIVE_INFINITY, sumSq.getResult(), 0);
70 sumSq.increment(Double.NEGATIVE_INFINITY);
71 assertEquals(Double.POSITIVE_INFINITY, sumSq.getResult(), 0);
72 sumSq.increment(Double.NaN);
73 assertTrue(Double.isNaN(sumSq.getResult()));
74 sumSq.increment(1);
75 assertTrue(Double.isNaN(sumSq.getResult()));
76 }
77
78 }