psteitz 2004/06/18 00:04:20
Modified: math/src/test/org/apache/commons/math/stat/univariate/moment
GeometricMeanTest.java
Log:
Added tests for special values.
Revision Changes Path
1.11 +31 -1
jakarta-commons/math/src/test/org/apache/commons/math/stat/univariate/moment/GeometricMeanTest.java
Index: GeometricMeanTest.java
===================================================================
RCS file:
/home/cvs/jakarta-commons/math/src/test/org/apache/commons/math/stat/univariate/moment/GeometricMeanTest.java,v
retrieving revision 1.10
retrieving revision 1.11
diff -u -r1.10 -r1.11
--- GeometricMeanTest.java 17 Jun 2004 21:37:05 -0000 1.10
+++ GeometricMeanTest.java 18 Jun 2004 07:04:20 -0000 1.11
@@ -55,5 +55,35 @@
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()));
+ }
}
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