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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one or more
3    * contributor license agreements.  See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * The ASF licenses this file to You under the Apache License, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License.  You may obtain a copy of the License at
8    *
9    *      http://www.apache.org/licenses/LICENSE-2.0
10   *
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS,
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   * See the License for the specific language governing permissions and
15   * limitations under the License.
16   */
17  package org.apache.commons.math3.stat.descriptive.rank;
18  
19  import org.apache.commons.math3.stat.descriptive.StorelessUnivariateStatisticAbstractTest;
20  import org.apache.commons.math3.stat.descriptive.UnivariateStatistic;
21  import org.junit.Assert;
22  import org.junit.Test;
23  
24  /**
25   * Test cases for the {@link UnivariateStatistic} class.
26   * @version $Id: MaxTest.java 1244107 2012-02-14 16:17:55Z erans $
27   */
28  public class MaxTest extends StorelessUnivariateStatisticAbstractTest {
29  
30      protected Max stat;
31  
32      /**
33       * {@inheritDoc}
34       */
35      @Override
36      public UnivariateStatistic getUnivariateStatistic() {
37          return new Max();
38      }
39  
40      /**
41       * {@inheritDoc}
42       */
43      @Override
44      public double expectedValue() {
45          return this.max;
46      }
47  
48      @Test
49      public void testSpecialValues() {
50          double[] testArray = {0d, Double.NaN, Double.NEGATIVE_INFINITY,
51                  Double.POSITIVE_INFINITY};
52          Max max = new Max();
53          Assert.assertTrue(Double.isNaN(max.getResult()));
54          max.increment(testArray[0]);
55          Assert.assertEquals(0d, max.getResult(), 0);
56          max.increment(testArray[1]);
57          Assert.assertEquals(0d, max.getResult(), 0);
58          max.increment(testArray[2]);
59          Assert.assertEquals(0d, max.getResult(), 0);
60          max.increment(testArray[3]);
61          Assert.assertEquals(Double.POSITIVE_INFINITY, max.getResult(), 0);
62          Assert.assertEquals(Double.POSITIVE_INFINITY, max.evaluate(testArray), 0);
63      }
64  
65      @Test
66      public void testNaNs() {
67          Max max = new Max();
68          double nan = Double.NaN;
69          Assert.assertEquals(3d, max.evaluate(new double[]{nan, 2d, 3d}), 0);
70          Assert.assertEquals(3d, max.evaluate(new double[]{1d, nan, 3d}), 0);
71          Assert.assertEquals(2d, max.evaluate(new double[]{1d, 2d, nan}), 0);
72          Assert.assertTrue(Double.isNaN(max.evaluate(new double[]{nan, nan, nan})));
73      }
74  
75  }