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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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48
49 public UnivariateStatistic getUnivariateStatistic() {
50 return new Max();
51 }
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56 public double expectedValue() {
57 return this.max;
58 }
59
60 public void testSpecialValues() {
61 double[] testArray = {0d, Double.NaN, Double.NEGATIVE_INFINITY,
62 Double.POSITIVE_INFINITY};
63 Max max = new Max();
64 assertTrue(Double.isNaN(max.getResult()));
65 max.increment(testArray[0]);
66 assertEquals(0d, max.getResult(), 0);
67 max.increment(testArray[1]);
68 assertEquals(0d, max.getResult(), 0);
69 max.increment(testArray[2]);
70 assertEquals(0d, max.getResult(), 0);
71 max.increment(testArray[3]);
72 assertEquals(Double.POSITIVE_INFINITY, max.getResult(), 0);
73 assertEquals(Double.POSITIVE_INFINITY, max.evaluate(testArray), 0);
74 }
75
76 public void testNaNs() {
77 Max max = new Max();
78 double nan = Double.NaN;
79 assertEquals(3d, max.evaluate(new double[]{nan, 2d, 3d}), 0);
80 assertEquals(3d, max.evaluate(new double[]{1d, nan, 3d}), 0);
81 assertEquals(2d, max.evaluate(new double[]{1d, 2d, nan}), 0);
82 assertTrue(Double.isNaN(max.evaluate(new double[]{nan, nan, nan})));
83 }
84
85 }