1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
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;
24
25
26
27
28
29 public class MinTest extends StorelessUnivariateStatisticAbstractTest{
30
31 protected Min stat;
32
33
34
35
36 public MinTest(String name) {
37 super(name);
38 }
39
40 public static Test suite() {
41 TestSuite suite = new TestSuite(MinTest.class);
42 suite.setName("Min Tests");
43 return suite;
44 }
45
46
47
48
49 public UnivariateStatistic getUnivariateStatistic() {
50 return new Min();
51 }
52
53
54
55
56 public double expectedValue() {
57 return this.min;
58 }
59
60 public void testSpecialValues() {
61 double[] testArray = {0d, Double.NaN, Double.POSITIVE_INFINITY,
62 Double.NEGATIVE_INFINITY};
63 Min min = new Min();
64 assertTrue(Double.isNaN(min.getResult()));
65 min.increment(testArray[0]);
66 assertEquals(0d, min.getResult(), 0);
67 min.increment(testArray[1]);
68 assertEquals(0d, min.getResult(), 0);
69 min.increment(testArray[2]);
70 assertEquals(0d, min.getResult(), 0);
71 min.increment(testArray[3]);
72 assertEquals(Double.NEGATIVE_INFINITY, min.getResult(), 0);
73 assertEquals(Double.NEGATIVE_INFINITY, min.evaluate(testArray), 0);
74 }
75
76 public void testNaNs() {
77 Min min = new Min();
78 double nan = Double.NaN;
79 assertEquals(2d, min.evaluate(new double[]{nan, 2d, 3d}), 0);
80 assertEquals(1d, min.evaluate(new double[]{1d, nan, 3d}), 0);
81 assertEquals(1d, min.evaluate(new double[]{1d, 2d, nan}), 0);
82 assertTrue(Double.isNaN(min.evaluate(new double[]{nan, nan, nan})));
83 }
84
85 }