Remove public modifiers from tests
diff --git a/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/ContinuousDistributionAbstractTest.java b/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/ContinuousDistributionAbstractTest.java
index 201ecfd..c2fdf9f 100644
--- a/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/ContinuousDistributionAbstractTest.java
+++ b/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/ContinuousDistributionAbstractTest.java
@@ -60,7 +60,7 @@
  * See {@link NormalDistributionTest} and {@link ChiSquaredDistributionTest}
  * for examples.
  */
-public abstract class ContinuousDistributionAbstractTest {
+abstract class ContinuousDistributionAbstractTest {
 
 //-------------------- Private test instance data -------------------------
     /**  Distribution instance used to perform tests */
diff --git a/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/DiscreteDistributionAbstractTest.java b/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/DiscreteDistributionAbstractTest.java
index 6315593..bac3bee 100644
--- a/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/DiscreteDistributionAbstractTest.java
+++ b/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/DiscreteDistributionAbstractTest.java
@@ -42,7 +42,7 @@
  *  use the setXxx methods for the instance data in test cases and call the verifyXxx methods
  *  to verify results.
  */
-public abstract class DiscreteDistributionAbstractTest {
+abstract class DiscreteDistributionAbstractTest {
 
 //-------------------- Private test instance data -------------------------
     /** Discrete distribution instance used to perform tests */