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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.math4.legacy.stat.descriptive.summary;
18  
19  import org.apache.commons.math4.legacy.stat.descriptive.StorelessUnivariateStatistic;
20  import org.apache.commons.math4.legacy.stat.descriptive.StorelessUnivariateStatisticAbstractTest;
21  import org.apache.commons.math4.legacy.stat.descriptive.UnivariateStatistic;
22  import org.junit.Assert;
23  import org.junit.Test;
24  
25  /**
26   * Test cases for the {@link SumOfSquares} class.
27   */
28  public class SumSqTest extends StorelessUnivariateStatisticAbstractTest{
29  
30      protected SumOfSquares stat;
31  
32      /**
33       * {@inheritDoc}
34       */
35      @Override
36      public UnivariateStatistic getUnivariateStatistic() {
37          return new SumOfSquares();
38      }
39  
40      /**
41       * {@inheritDoc}
42       */
43      @Override
44      public double expectedValue() {
45          return this.sumSq;
46      }
47  
48      @Test
49      public void testSpecialValues() {
50          SumOfSquares sumSq = new SumOfSquares();
51          Assert.assertEquals(0, sumSq.getResult(), 0);
52          sumSq.increment(2d);
53          Assert.assertEquals(4d, sumSq.getResult(), 0);
54          sumSq.increment(Double.POSITIVE_INFINITY);
55          Assert.assertEquals(Double.POSITIVE_INFINITY, sumSq.getResult(), 0);
56          sumSq.increment(Double.NEGATIVE_INFINITY);
57          Assert.assertEquals(Double.POSITIVE_INFINITY, sumSq.getResult(), 0);
58          sumSq.increment(Double.NaN);
59          Assert.assertTrue(Double.isNaN(sumSq.getResult()));
60          sumSq.increment(1);
61          Assert.assertTrue(Double.isNaN(sumSq.getResult()));
62      }
63  
64      @Override
65      protected void checkClearValue(StorelessUnivariateStatistic statistic) {
66          Assert.assertEquals(0, statistic.getResult(), 0);
67      }
68  }