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16 package org.apache.commons.math.stat.descriptive.rank;
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: 321508 $ $Date: 2005-10-15 15:16:28 -0700 (Sat, 15 Oct 2005) $
27 */
28 public class MaxTest extends StorelessUnivariateStatisticAbstractTest{
29
30 protected Max stat;
31
32 /**
33 * @param name
34 */
35 public MaxTest(String name) {
36 super(name);
37 }
38
39 public static Test suite() {
40 TestSuite suite = new TestSuite(MaxTest.class);
41 suite.setName("Max Tests");
42 return suite;
43 }
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47
48 public UnivariateStatistic getUnivariateStatistic() {
49 return new Max();
50 }
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52
53
54
55 public double expectedValue() {
56 return this.max;
57 }
58
59 public void testSpecialValues() {
60 double[] testArray = {0d, Double.NaN, Double.NEGATIVE_INFINITY,
61 Double.POSITIVE_INFINITY};
62 Max max = new Max();
63 assertTrue(Double.isNaN(max.getResult()));
64 max.increment(testArray[0]);
65 assertEquals(0d, max.getResult(), 0);
66 max.increment(testArray[1]);
67 assertEquals(0d, max.getResult(), 0);
68 max.increment(testArray[2]);
69 assertEquals(0d, max.getResult(), 0);
70 max.increment(testArray[3]);
71 assertEquals(Double.POSITIVE_INFINITY, max.getResult(), 0);
72 assertEquals(Double.POSITIVE_INFINITY, max.evaluate(testArray), 0);
73 }
74
75 public void testNaNs() {
76 Max max = new Max();
77 double nan = Double.NaN;
78 assertEquals(3d, max.evaluate(new double[]{nan, 2d, 3d}), 0);
79 assertEquals(3d, max.evaluate(new double[]{1d, nan, 3d}), 0);
80 assertEquals(2d, max.evaluate(new double[]{1d, 2d, nan}), 0);
81 assertTrue(Double.isNaN(max.evaluate(new double[]{nan, nan, nan})));
82 }
83
84 }