001 /* 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017 package org.apache.commons.math.stat.descriptive.rank; 018 019 import junit.framework.Test; 020 import junit.framework.TestSuite; 021 022 import org.apache.commons.math.stat.descriptive.StorelessUnivariateStatisticAbstractTest; 023 import org.apache.commons.math.stat.descriptive.UnivariateStatistic; 024 025 /** 026 * Test cases for the {@link UnivariateStatistic} class. 027 * @version $Revision: 762087 $ $Date: 2009-04-05 10:20:18 -0400 (Sun, 05 Apr 2009) $ 028 */ 029 public class MaxTest extends StorelessUnivariateStatisticAbstractTest{ 030 031 protected Max stat; 032 033 /** 034 * @param name 035 */ 036 public MaxTest(String name) { 037 super(name); 038 } 039 040 public static Test suite() { 041 TestSuite suite = new TestSuite(MaxTest.class); 042 suite.setName("Max Tests"); 043 return suite; 044 } 045 046 /** 047 * {@inheritDoc} 048 */ 049 @Override 050 public UnivariateStatistic getUnivariateStatistic() { 051 return new Max(); 052 } 053 054 /** 055 * {@inheritDoc} 056 */ 057 @Override 058 public double expectedValue() { 059 return this.max; 060 } 061 062 public void testSpecialValues() { 063 double[] testArray = {0d, Double.NaN, Double.NEGATIVE_INFINITY, 064 Double.POSITIVE_INFINITY}; 065 Max max = new Max(); 066 assertTrue(Double.isNaN(max.getResult())); 067 max.increment(testArray[0]); 068 assertEquals(0d, max.getResult(), 0); 069 max.increment(testArray[1]); 070 assertEquals(0d, max.getResult(), 0); 071 max.increment(testArray[2]); 072 assertEquals(0d, max.getResult(), 0); 073 max.increment(testArray[3]); 074 assertEquals(Double.POSITIVE_INFINITY, max.getResult(), 0); 075 assertEquals(Double.POSITIVE_INFINITY, max.evaluate(testArray), 0); 076 } 077 078 public void testNaNs() { 079 Max max = new Max(); 080 double nan = Double.NaN; 081 assertEquals(3d, max.evaluate(new double[]{nan, 2d, 3d}), 0); 082 assertEquals(3d, max.evaluate(new double[]{1d, nan, 3d}), 0); 083 assertEquals(2d, max.evaluate(new double[]{1d, 2d, nan}), 0); 084 assertTrue(Double.isNaN(max.evaluate(new double[]{nan, nan, nan}))); 085 } 086 087 }