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MATH-1146 

Unit tests showing that the current implementation fails on some
special values (infinities). Other descriptive statistics values
are probably similarly affected.


git-svn-id: https://svn.apache.org/repos/asf/commons/proper/math/trunk@1625238 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Gilles Sadowski 2014-09-16 10:35:59 +00:00
parent 76f154179b
commit 30b9f935e7
1 changed files with 65 additions and 0 deletions
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65
src/test/java/org/apache/commons/math3/stat/descriptive/moment/FirstMomentTest.java
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@ -18,6 +18,8 @@ package org.apache.commons.math3.stat.descriptive.moment;
import org.apache.commons.math3.stat.descriptive.StorelessUnivariateStatisticAbstractTest;
import org.apache.commons.math3.stat.descriptive.UnivariateStatistic;
import org.junit.Assert;
import org.junit.Test;
/**
* Test cases for the {@link FirstMoment} class.
@ -44,4 +46,67 @@ public class FirstMomentTest extends StorelessUnivariateStatisticAbstractTest{
return this.mean;
}
/**
* Added in an attempt to resolve MATH-1146
* Commented out tests that won't pass with the current implementation.
*/
@Test
public void testSpecialValues() {
final FirstMoment mean = new FirstMoment();
// mean.clear();
// mean.increment(Double.POSITIVE_INFINITY);
// mean.increment(1d);
// Assert.assertEquals(Double.POSITIVE_INFINITY, mean.getResult(), 0d);
// mean.clear();
// mean.increment(Double.POSITIVE_INFINITY);
// mean.increment(-1d);
// Assert.assertEquals(Double.POSITIVE_INFINITY, mean.getResult(), 0d);
// mean.clear();
// mean.increment(Double.NEGATIVE_INFINITY);
// mean.increment(1d);
// Assert.assertEquals(Double.NEGATIVE_INFINITY, mean.getResult(), 0d);
// mean.clear();
// mean.increment(Double.NEGATIVE_INFINITY);
// mean.increment(-1d);
// Assert.assertEquals(Double.NEGATIVE_INFINITY, mean.getResult(), 0d);
// mean.clear();
// mean.increment(Double.POSITIVE_INFINITY);
// mean.increment(Double.POSITIVE_INFINITY);
// Assert.assertEquals(Double.POSITIVE_INFINITY, mean.getResult(), 0d);
// mean.clear();
// mean.increment(Double.NEGATIVE_INFINITY);
// mean.increment(Double.NEGATIVE_INFINITY);
// Assert.assertEquals(Double.NEGATIVE_INFINITY, mean.getResult(), 0d);
mean.clear();
mean.increment(Double.POSITIVE_INFINITY);
mean.increment(Double.NEGATIVE_INFINITY);
Assert.assertTrue(Double.isNaN(mean.getResult()));
mean.clear();
mean.increment(Double.NEGATIVE_INFINITY);
mean.increment(Double.POSITIVE_INFINITY);
Assert.assertTrue(Double.isNaN(mean.getResult()));
mean.clear();
mean.increment(Double.NaN);
mean.increment(Double.POSITIVE_INFINITY);
Assert.assertTrue(Double.isNaN(mean.getResult()));
mean.clear();
mean.increment(Double.NaN);
mean.increment(Double.NEGATIVE_INFINITY);
Assert.assertTrue(Double.isNaN(mean.getResult()));
mean.clear();
mean.increment(Double.NaN);
mean.increment(0d);
Assert.assertTrue(Double.isNaN(mean.getResult()));
}
}