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17 package org.apache.commons.math.stat.descriptive.rank;
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 MaxTest extends StorelessUnivariateStatisticAbstractTest{
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31 protected Max stat;
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36 public MaxTest(String name) {
37 super(name);
38 }
39
40 public static Test suite() {
41 TestSuite suite = new TestSuite(MaxTest.class);
42 suite.setName("Max Tests");
43 return suite;
44 }
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49 @Override
50 public UnivariateStatistic getUnivariateStatistic() {
51 return new Max();
52 }
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57 @Override
58 public double expectedValue() {
59 return this.max;
60 }
61
62 public void testSpecialValues() {
63 double[] testArray = {0d, Double.NaN, Double.NEGATIVE_INFINITY,
64 Double.POSITIVE_INFINITY};
65 Max max = new Max();
66 assertTrue(Double.isNaN(max.getResult()));
67 max.increment(testArray[0]);
68 assertEquals(0d, max.getResult(), 0);
69 max.increment(testArray[1]);
70 assertEquals(0d, max.getResult(), 0);
71 max.increment(testArray[2]);
72 assertEquals(0d, max.getResult(), 0);
73 max.increment(testArray[3]);
74 assertEquals(Double.POSITIVE_INFINITY, max.getResult(), 0);
75 assertEquals(Double.POSITIVE_INFINITY, max.evaluate(testArray), 0);
76 }
77
78 public void testNaNs() {
79 Max max = new Max();
80 double nan = Double.NaN;
81 assertEquals(3d, max.evaluate(new double[]{nan, 2d, 3d}), 0);
82 assertEquals(3d, max.evaluate(new double[]{1d, nan, 3d}), 0);
83 assertEquals(2d, max.evaluate(new double[]{1d, 2d, nan}), 0);
84 assertTrue(Double.isNaN(max.evaluate(new double[]{nan, nan, nan})));
85 }
86
87 }