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Added tests to ensure NaN is returned for n<4 

git-svn-id: https://svn.apache.org/repos/asf/jakarta/commons/proper/math/trunk@141311 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Phil Steitz 2004-06-18 01:43:32 +00:00
parent f1ba9cea7c
commit a3d72f7906
1 changed files with 18 additions and 1 deletions
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19
src/test/org/apache/commons/math/stat/univariate/moment/KurtosisTest.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: 1.11 $ $Date: 2004/06/17 21:37:05 $
* @version $Revision: 1.12 $ $Date: 2004/06/18 01:43:32 $
*/
public class KurtosisTest extends StorelessUnivariateStatisticAbstractTest{
@ -55,5 +55,22 @@ public class KurtosisTest extends StorelessUnivariateStatisticAbstractTest{
public double expectedValue() {
return this.kurt;
}
/**
* Make sure Double.NaN is returned iff n < 4
*
*/
public void testNaN() {
Kurtosis kurt = new Kurtosis();
assertTrue(Double.isNaN(kurt.getResult()));
kurt.increment(1d);
assertTrue(Double.isNaN(kurt.getResult()));
kurt.increment(1d);
assertTrue(Double.isNaN(kurt.getResult()));
kurt.increment(1d);
assertTrue(Double.isNaN(kurt.getResult()));
kurt.increment(1d);
assertFalse(Double.isNaN(kurt.getResult()));
}
}