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Added tests for special values. 

git-svn-id: https://svn.apache.org/repos/asf/jakarta/commons/proper/math/trunk@141317 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Phil Steitz 2004-06-18 07:04:20 +00:00
parent e90f31a26c
commit e5ea3a0485
1 changed files with 31 additions and 1 deletions
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32
src/test/org/apache/commons/math/stat/univariate/moment/GeometricMeanTest.java
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@ -23,7 +23,7 @@ import org.apache.commons.math.stat.univariate.UnivariateStatistic;
/**
* Test cases for the {@link UnivariateStatistic} class.
* @version $Revision: 1.10 $ $Date: 2004/06/17 21:37:05 $
* @version $Revision: 1.11 $ $Date: 2004/06/18 07:04:20 $
*/
public class GeometricMeanTest extends StorelessUnivariateStatisticAbstractTest{
@ -55,5 +55,35 @@ public class GeometricMeanTest extends StorelessUnivariateStatisticAbstractTest{
public double expectedValue() {
return this.geoMean;
}
public void testSpecialValues() {
GeometricMean mean = new GeometricMean();
// empty
assertTrue(Double.isNaN(mean.getResult()));
// finite data
mean.increment(1d);
assertFalse(Double.isNaN(mean.getResult()));
// add 0 -- makes log sum blow to minus infinity, should make 0
mean.increment(0d);
assertEquals(0d, mean.getResult(), 0);
// add positive infinity - note the minus infinity above
mean.increment(Double.POSITIVE_INFINITY);
assertTrue(Double.isNaN(mean.getResult()));
// clear
mean.clear();
assertTrue(Double.isNaN(mean.getResult()));
// positive infinity by itself
mean.increment(Double.POSITIVE_INFINITY);
assertEquals(Double.POSITIVE_INFINITY, mean.getResult(), 0);
// negative value -- should make NaN
mean.increment(-2d);
assertTrue(Double.isNaN(mean.getResult()));
}
}