commit 877eb70d7ae9b6971b360d46dcfcb16681676a07
author aherbert <aherbert@apache.org> Fri Jul 30 16:44:09 2021 +0100
committer aherbert <aherbert@apache.org> Fri Jul 30 16:44:09 2021 +0100
tree 5c1ee7510423b1fd443295d5d61243331b84e393
parent c076ba3ee5bd0f6c7e60af02c2e1f0d870e689fd

Add edge case coverage for density

commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/GammaDistributionTest.java

diff --git a/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/GammaDistributionTest.java b/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/GammaDistributionTest.java
index b7eb220..691d8b1 100644
--- a/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/GammaDistributionTest.java
+++ b/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/GammaDistributionTest.java
@@ -94,6 +94,13 @@
     //-------------------- Additional test cases -------------------------------
 
     @Test
+    void testDensityAtSupportBounds() {
+        final GammaDistribution distribution = makeDistribution();
+        Assertions.assertEquals(0.0, distribution.density(0));
+        Assertions.assertEquals(0.0, distribution.density(Double.POSITIVE_INFINITY));
+    }
+
+    @Test
     void testParameterAccessors() {
         final GammaDistribution distribution = makeDistribution();
         Assertions.assertEquals(4d, distribution.getShape());

commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/LevyDistributionTest.java

diff --git a/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/LevyDistributionTest.java b/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/LevyDistributionTest.java
index 01cedcb..c85632c 100644
--- a/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/LevyDistributionTest.java
+++ b/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/LevyDistributionTest.java
@@ -87,6 +87,13 @@
     //-------------------- Additional test cases -------------------------------
 
     @Test
+    void testDensityAtSupportBounds() {
+        final LevyDistribution distribution = makeDistribution();
+        // Below the location
+        Assertions.assertEquals(0.0, distribution.density(distribution.getLocation() - 1));
+    }
+
+    @Test
     void testParameterAccessors() {
         final LevyDistribution d = makeDistribution();
         Assertions.assertEquals(1.2, d.getLocation());

commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/WeibullDistributionTest.java

diff --git a/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/WeibullDistributionTest.java b/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/WeibullDistributionTest.java
index aa076ba..ee4da66 100644
--- a/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/WeibullDistributionTest.java
+++ b/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/WeibullDistributionTest.java
@@ -84,6 +84,13 @@
     //-------------------- Additional test cases -------------------------------
 
     @Test
+    void testDensityAtSupportBounds() {
+        final WeibullDistribution distribution = makeDistribution();
+        Assertions.assertEquals(0.0, distribution.density(0));
+        Assertions.assertEquals(0.0, distribution.density(Double.POSITIVE_INFINITY));
+    }
+
+    @Test
     void testInverseCumulativeProbabilitySmallPAccuracy() {
         final WeibullDistribution dist = new WeibullDistribution(2, 3);
         final double t = dist.inverseCumulativeProbability(1e-17);