Remove public modifiers for test fixtures.
diff --git a/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/AbstractContinuousDistributionTest.java b/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/AbstractContinuousDistributionTest.java
index d44ca18..2c6d852 100644
--- a/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/AbstractContinuousDistributionTest.java
+++ b/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/AbstractContinuousDistributionTest.java
@@ -23,7 +23,7 @@
 import org.junit.jupiter.api.Test;
 
 /** Various tests related to MATH-699. */
-public class AbstractContinuousDistributionTest {
+class AbstractContinuousDistributionTest {
 
     @Test
     void testContinuous() {
diff --git a/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/AbstractDiscreteDistributionTest.java b/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/AbstractDiscreteDistributionTest.java
index 44358c8..39d45dc 100644
--- a/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/AbstractDiscreteDistributionTest.java
+++ b/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/AbstractDiscreteDistributionTest.java
@@ -22,7 +22,7 @@
 /**
  * Test cases for AbstractDiscreteDistribution default implementations.
  */
-public class AbstractDiscreteDistributionTest {
+class AbstractDiscreteDistributionTest {
     protected final DiceDistribution diceDistribution = new DiceDistribution();
     protected final double p = diceDistribution.probability(1);
 
diff --git a/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/BetaDistributionTest.java b/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/BetaDistributionTest.java
index 71c9ace..8e2ce43 100644
--- a/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/BetaDistributionTest.java
+++ b/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/BetaDistributionTest.java
@@ -25,7 +25,7 @@
 import org.junit.jupiter.api.Assertions;
 import org.junit.jupiter.api.Test;
 
-public class BetaDistributionTest {
+class BetaDistributionTest {
 
     static final double[] ALPHA_BETAS = {0.1, 1, 10, 100, 1000};
     static final double EPSILON = StatUtils.min(ALPHA_BETAS);
diff --git a/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/BinomialDistributionTest.java b/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/BinomialDistributionTest.java
index 8ad6e36..2b01f20 100644
--- a/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/BinomialDistributionTest.java
+++ b/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/BinomialDistributionTest.java
@@ -24,12 +24,12 @@
  * Test cases for BinomialDistribution. Extends DiscreteDistributionAbstractTest.
  * See class javadoc for DiscreteDistributionAbstractTest for details.
  */
-public class BinomialDistributionTest extends DiscreteDistributionAbstractTest {
+class BinomialDistributionTest extends DiscreteDistributionAbstractTest {
 
     //---------------------- Override tolerance --------------------------------
 
     @BeforeEach
-    public void customSetUp() {
+    void customSetUp() {
         setTolerance(1e-12);
     }
 
diff --git a/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/CauchyDistributionTest.java b/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/CauchyDistributionTest.java
index 3a17d78..4d07667 100644
--- a/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/CauchyDistributionTest.java
+++ b/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/CauchyDistributionTest.java
@@ -26,14 +26,14 @@
  * Extends ContinuousDistributionAbstractTest.  See class javadoc for
  * ContinuousDistributionAbstractTest for details.
  */
-public class CauchyDistributionTest extends ContinuousDistributionAbstractTest {
+class CauchyDistributionTest extends ContinuousDistributionAbstractTest {
 
     private static final double DEFAULT_TOLERANCE = 1e-7;
 
     //---------------------- Override tolerance --------------------------------
 
     @BeforeEach
-    public void customSetUp() {
+    void customSetUp() {
         setTolerance(DEFAULT_TOLERANCE);
     }
 
diff --git a/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/ChiSquaredDistributionTest.java b/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/ChiSquaredDistributionTest.java
index aec0eb0..921129b 100644
--- a/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/ChiSquaredDistributionTest.java
+++ b/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/ChiSquaredDistributionTest.java
@@ -26,12 +26,12 @@
  *
  * @see ContinuousDistributionAbstractTest
  */
-public class ChiSquaredDistributionTest extends ContinuousDistributionAbstractTest {
+class ChiSquaredDistributionTest extends ContinuousDistributionAbstractTest {
 
     //---------------------- Override tolerance --------------------------------
 
     @BeforeEach
-    public void customSetUp() {
+    void customSetUp() {
         setTolerance(1e-9);
     }
 
diff --git a/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/ConstantContinuousDistributionTest.java b/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/ConstantContinuousDistributionTest.java
index 65d7670..6da7840 100644
--- a/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/ConstantContinuousDistributionTest.java
+++ b/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/ConstantContinuousDistributionTest.java
@@ -24,12 +24,12 @@
 /**
  * Test cases for ConstantContinuousDistribution.
  */
-public class ConstantContinuousDistributionTest extends ContinuousDistributionAbstractTest {
+class ConstantContinuousDistributionTest extends ContinuousDistributionAbstractTest {
 
     //---------------------- Override tolerance --------------------------------
 
     @BeforeEach
-    public void customSetUp() {
+    void customSetUp() {
         setTolerance(0);
     }
 
@@ -82,7 +82,7 @@
 
     @Test
     @Override
-    public void testSampler() {
+    void testSampler() {
         final double value = 12.345;
         final ContinuousDistribution.Sampler sampler = new ConstantContinuousDistribution(value).createSampler(null);
         for (int i = 0; i < 10; i++) {
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 666bdbc..201ecfd 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
@@ -134,7 +134,7 @@
      * to alter the defaults.
      */
     @BeforeEach
-    public void setUp() {
+    void setUp() {
         distribution = makeDistribution();
         cumulativeTestPoints = makeCumulativeTestPoints();
         cumulativeTestValues = makeCumulativeTestValues();
@@ -148,7 +148,7 @@
      * Cleans up test instance data
      */
     @AfterEach
-    public void tearDown() {
+    void tearDown() {
         distribution = null;
         cumulativeTestPoints = null;
         cumulativeTestValues = null;
diff --git a/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/ContinuousDistributionTest.java b/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/ContinuousDistributionTest.java
index c1136e8..da3b3aa 100644
--- a/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/ContinuousDistributionTest.java
+++ b/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/ContinuousDistributionTest.java
@@ -23,7 +23,7 @@
 /**
  * Test default implementations in the {@link ContinuousDistribution} interface.
  */
-public class ContinuousDistributionTest {
+class ContinuousDistributionTest {
     /**
      * Test the default interface methods.
      */
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 2281444..6315593 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
@@ -117,7 +117,7 @@
      * Setup sets all test instance data to default values
      */
     @BeforeEach
-    public void setUp() {
+    void setUp() {
         distribution = makeDistribution();
         densityTestPoints = makeDensityTestPoints();
         densityTestValues = makeDensityTestValues();
@@ -132,7 +132,7 @@
      * Cleans up test instance data
      */
     @AfterEach
-    public void tearDown() {
+    void tearDown() {
         distribution = null;
         densityTestPoints = null;
         densityTestValues = null;
diff --git a/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/DiscreteDistributionTest.java b/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/DiscreteDistributionTest.java
index 7ad409e..aa4960a 100644
--- a/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/DiscreteDistributionTest.java
+++ b/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/DiscreteDistributionTest.java
@@ -23,7 +23,7 @@
 /**
  * Test default implementations in the {@link DiscreteDistribution} interface.
  */
-public class DiscreteDistributionTest {
+class DiscreteDistributionTest {
     /**
      * Test the default interface methods.
      */
diff --git a/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/ExponentialDistributionTest.java b/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/ExponentialDistributionTest.java
index de9e758..c62f638 100644
--- a/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/ExponentialDistributionTest.java
+++ b/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/ExponentialDistributionTest.java
@@ -26,12 +26,12 @@
  * Extends ContinuousDistributionAbstractTest.  See class javadoc for
  * ContinuousDistributionAbstractTest for details.
  */
-public class ExponentialDistributionTest extends ContinuousDistributionAbstractTest {
+class ExponentialDistributionTest extends ContinuousDistributionAbstractTest {
 
     //---------------------- Override tolerance --------------------------------
 
     @BeforeEach
-    public void customSetUp() {
+    void customSetUp() {
         setTolerance(1e-9);
     }
 
diff --git a/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/FDistributionTest.java b/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/FDistributionTest.java
index b303bce..ae87559 100644
--- a/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/FDistributionTest.java
+++ b/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/FDistributionTest.java
@@ -25,12 +25,12 @@
  * Extends ContinuousDistributionAbstractTest.  See class javadoc for
  * ContinuousDistributionAbstractTest for details.
  */
-public class FDistributionTest extends ContinuousDistributionAbstractTest {
+class FDistributionTest extends ContinuousDistributionAbstractTest {
 
     //---------------------- Override tolerance --------------------------------
 
     @BeforeEach
-    public void customSetUp() {
+    void customSetUp() {
         setTolerance(1e-9);
     }
 
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 2ebf952..11e3b93 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
@@ -33,14 +33,14 @@
  * Extends ContinuousDistributionAbstractTest.  See class javadoc for
  * ContinuousDistributionAbstractTest for details.
  */
-public class GammaDistributionTest extends ContinuousDistributionAbstractTest {
+class GammaDistributionTest extends ContinuousDistributionAbstractTest {
 
     private static final double HALF_LOG_2_PI = 0.5 * Math.log(2.0 * Math.PI);
 
     //---------------------- Override tolerance --------------------------------
 
     @BeforeEach
-    public void customSetUp() {
+    void customSetUp() {
         setTolerance(1e-9);
     }
 
diff --git a/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/GeometricDistributionTest.java b/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/GeometricDistributionTest.java
index 129feed..918b45a 100644
--- a/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/GeometricDistributionTest.java
+++ b/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/GeometricDistributionTest.java
@@ -24,12 +24,12 @@
  * Test cases for GeometricDistribution.
  * See class javadoc for DiscreteDistributionAbstractTest for details.
  */
-public class GeometricDistributionTest extends DiscreteDistributionAbstractTest {
+class GeometricDistributionTest extends DiscreteDistributionAbstractTest {
 
     //---------------------- Override tolerance --------------------------------
 
     @BeforeEach
-    public void customSetUp() {
+    void customSetUp() {
         setTolerance(1e-12);
     }
 
diff --git a/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/GumbelDistributionTest.java b/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/GumbelDistributionTest.java
index abc0612..e90fde0 100644
--- a/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/GumbelDistributionTest.java
+++ b/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/GumbelDistributionTest.java
@@ -22,7 +22,7 @@
 /**
  * Test cases for GumbelDistribution.
  */
-public class GumbelDistributionTest extends ContinuousDistributionAbstractTest {
+class GumbelDistributionTest extends ContinuousDistributionAbstractTest {
 
     //-------------- Implementations for abstract methods ----------------------
 
diff --git a/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/HypergeometricDistributionTest.java b/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/HypergeometricDistributionTest.java
index a142d2c..a662ea2 100644
--- a/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/HypergeometricDistributionTest.java
+++ b/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/HypergeometricDistributionTest.java
@@ -28,12 +28,12 @@
  * Extends DiscreteDistributionAbstractTest.  See class javadoc for
  * DiscreteDistributionAbstractTest for details.
  */
-public class HypergeometricDistributionTest extends DiscreteDistributionAbstractTest {
+class HypergeometricDistributionTest extends DiscreteDistributionAbstractTest {
 
     //---------------------- Override tolerance --------------------------------
 
     @BeforeEach
-    public void customSetUp() {
+    void customSetUp() {
         setTolerance(1e-12);
     }
 
diff --git a/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/LaplaceDistributionTest.java b/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/LaplaceDistributionTest.java
index 5cf85e5..ce066b5 100644
--- a/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/LaplaceDistributionTest.java
+++ b/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/LaplaceDistributionTest.java
@@ -22,7 +22,7 @@
 /**
  * Test cases for LaplaceDistribution.
  */
-public class LaplaceDistributionTest extends ContinuousDistributionAbstractTest {
+class LaplaceDistributionTest extends ContinuousDistributionAbstractTest {
 
     //-------------- Implementations for abstract methods ----------------------
 
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 a1fa752..977b4dd 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
@@ -19,7 +19,7 @@
 import org.junit.jupiter.api.Assertions;
 import org.junit.jupiter.api.Test;
 
-public class LevyDistributionTest extends ContinuousDistributionAbstractTest {
+class LevyDistributionTest extends ContinuousDistributionAbstractTest {
 
     //-------------- Implementations for abstract methods ----------------------
 
diff --git a/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/LogNormalDistributionTest.java b/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/LogNormalDistributionTest.java
index c19f33d..f5c5cb6 100644
--- a/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/LogNormalDistributionTest.java
+++ b/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/LogNormalDistributionTest.java
@@ -26,12 +26,12 @@
  * {@link ContinuousDistributionAbstractTest}. See class javadoc of that class
  * for details.
  */
-public class LogNormalDistributionTest extends ContinuousDistributionAbstractTest {
+class LogNormalDistributionTest extends ContinuousDistributionAbstractTest {
 
     //---------------------- Override tolerance --------------------------------
 
     @BeforeEach
-    public void customSetUp() {
+    void customSetUp() {
         setTolerance(1e-7);
     }
 
diff --git a/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/LogisticsDistributionTest.java b/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/LogisticsDistributionTest.java
index 1444433..e334b48 100644
--- a/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/LogisticsDistributionTest.java
+++ b/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/LogisticsDistributionTest.java
@@ -22,7 +22,7 @@
 /**
  * Test cases for LogisticsDistribution.
  */
-public class LogisticsDistributionTest extends ContinuousDistributionAbstractTest {
+class LogisticsDistributionTest extends ContinuousDistributionAbstractTest {
 
     //-------------- Implementations for abstract methods ----------------------
 
diff --git a/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/NakagamiDistributionTest.java b/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/NakagamiDistributionTest.java
index 4a5f151..d9d5934 100644
--- a/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/NakagamiDistributionTest.java
+++ b/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/NakagamiDistributionTest.java
@@ -22,7 +22,7 @@
 /**
  * Test cases for NakagamiDistribution.
  */
-public class NakagamiDistributionTest extends ContinuousDistributionAbstractTest {
+class NakagamiDistributionTest extends ContinuousDistributionAbstractTest {
 
     //-------------- Implementations for abstract methods ----------------------
 
diff --git a/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/NormalDistributionTest.java b/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/NormalDistributionTest.java
index 5b37c29..0beae1e 100644
--- a/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/NormalDistributionTest.java
+++ b/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/NormalDistributionTest.java
@@ -26,14 +26,14 @@
  * {@link ContinuousDistributionAbstractTest}. See class javadoc of that class
  * for details.
  */
-public class NormalDistributionTest extends ContinuousDistributionAbstractTest {
+class NormalDistributionTest extends ContinuousDistributionAbstractTest {
 
     private static final double DEFAULT_TOLERANCE = 1e-7;
 
     //---------------------- Override tolerance --------------------------------
 
     @BeforeEach
-    public void customSetUp() {
+    void customSetUp() {
         setTolerance(DEFAULT_TOLERANCE);
     }
 
diff --git a/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/ParetoDistributionTest.java b/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/ParetoDistributionTest.java
index 2074c42..73b13d3 100644
--- a/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/ParetoDistributionTest.java
+++ b/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/ParetoDistributionTest.java
@@ -25,12 +25,12 @@
  * Test cases for {@link ParetoDistribution}.
  * Extends {@link ContinuousDistributionAbstractTest}. See class javadoc of that class for details.
  */
-public class ParetoDistributionTest extends ContinuousDistributionAbstractTest {
+class ParetoDistributionTest extends ContinuousDistributionAbstractTest {
 
     //---------------------- Override tolerance --------------------------------
 
     @BeforeEach
-    public void customSetUp() {
+    void customSetUp() {
         setTolerance(1e-7);
     }
 
diff --git a/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/PascalDistributionTest.java b/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/PascalDistributionTest.java
index 446a7ef..3fbe13c 100644
--- a/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/PascalDistributionTest.java
+++ b/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/PascalDistributionTest.java
@@ -25,14 +25,14 @@
  * Extends DiscreteDistributionAbstractTest.  See class javadoc for
  * DiscreteDistributionAbstractTest for details.
  */
-public class PascalDistributionTest extends DiscreteDistributionAbstractTest {
+class PascalDistributionTest extends DiscreteDistributionAbstractTest {
 
     private static final double DEFAULT_TOLERANCE = 1e-7;
 
     //---------------------- Override tolerance --------------------------------
 
     @BeforeEach
-    public void customSetUp() {
+    void customSetUp() {
         setTolerance(DEFAULT_TOLERANCE);
     }
 
diff --git a/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/PoissonDistributionTest.java b/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/PoissonDistributionTest.java
index a2351ad..8a71a8a 100644
--- a/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/PoissonDistributionTest.java
+++ b/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/PoissonDistributionTest.java
@@ -23,7 +23,7 @@
 /**
  * <code>PoissonDistributionTest</code>
  */
-public class PoissonDistributionTest extends DiscreteDistributionAbstractTest {
+class PoissonDistributionTest extends DiscreteDistributionAbstractTest {
 
     /**
      * Poisson parameter value for the test distribution.
@@ -33,7 +33,7 @@
     //---------------------- Override tolerance --------------------------------
 
     @BeforeEach
-    public void customSetUp() {
+    void customSetUp() {
         setTolerance(1e-12);
     }
 
diff --git a/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/TDistributionTest.java b/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/TDistributionTest.java
index 6953672..dba7dc9 100644
--- a/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/TDistributionTest.java
+++ b/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/TDistributionTest.java
@@ -24,12 +24,12 @@
  * Extends ContinuousDistributionAbstractTest.  See class javadoc for
  * ContinuousDistributionAbstractTest for details.
  */
-public class TDistributionTest extends ContinuousDistributionAbstractTest {
+class TDistributionTest extends ContinuousDistributionAbstractTest {
 
     //---------------------- Override tolerance --------------------------------
 
     @BeforeEach
-    public void customSetUp() {
+    void customSetUp() {
         setTolerance(1e-9);
     }
 
diff --git a/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/TriangularDistributionTest.java b/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/TriangularDistributionTest.java
index c1daab8..f7c9db0 100644
--- a/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/TriangularDistributionTest.java
+++ b/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/TriangularDistributionTest.java
@@ -25,12 +25,12 @@
  * Test cases for {@link TriangularDistribution}. See class javadoc for
  * {@link ContinuousDistributionAbstractTest} for further details.
  */
-public class TriangularDistributionTest extends ContinuousDistributionAbstractTest {
+class TriangularDistributionTest extends ContinuousDistributionAbstractTest {
 
     //---------------------- Override tolerance --------------------------------
 
     @BeforeEach
-    public void customSetUp() {
+    void customSetUp() {
         setTolerance(1e-4);
     }
 
diff --git a/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/UniformContinuousDistributionTest.java b/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/UniformContinuousDistributionTest.java
index 5864513..3938421 100644
--- a/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/UniformContinuousDistributionTest.java
+++ b/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/UniformContinuousDistributionTest.java
@@ -25,12 +25,12 @@
  * Test cases for UniformContinuousDistribution. See class javadoc for
  * {@link ContinuousDistributionAbstractTest} for further details.
  */
-public class UniformContinuousDistributionTest extends ContinuousDistributionAbstractTest {
+class UniformContinuousDistributionTest extends ContinuousDistributionAbstractTest {
 
     //---------------------- Override tolerance --------------------------------
 
     @BeforeEach
-    public void customSetUp() {
+    void customSetUp() {
         setTolerance(1e-4);
     }
 
diff --git a/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/UniformDiscreteDistributionTest.java b/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/UniformDiscreteDistributionTest.java
index 242a7d5..d0fcd27 100644
--- a/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/UniformDiscreteDistributionTest.java
+++ b/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/UniformDiscreteDistributionTest.java
@@ -26,12 +26,12 @@
  * Test cases for UniformDiscreteDistribution. See class javadoc for
  * {@link DiscreteDistributionAbstractTest} for further details.
  */
-public class UniformDiscreteDistributionTest extends DiscreteDistributionAbstractTest {
+class UniformDiscreteDistributionTest extends DiscreteDistributionAbstractTest {
 
     //---------------------- Override tolerance --------------------------------
 
     @BeforeEach
-    public void customSetUp() {
+    void customSetUp() {
         setTolerance(1e-9);
     }
 
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 0f20e12..02df59a 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
@@ -26,7 +26,7 @@
  * Extends ContinuousDistributionAbstractTest.  See class javadoc for
  * ContinuousDistributionAbstractTest for details.
  */
-public class WeibullDistributionTest extends ContinuousDistributionAbstractTest {
+class WeibullDistributionTest extends ContinuousDistributionAbstractTest {
 
     //-------------- Implementations for abstract methods ----------------------
 
diff --git a/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/ZipfDistributionTest.java b/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/ZipfDistributionTest.java
index 730d50e..3804048 100644
--- a/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/ZipfDistributionTest.java
+++ b/commons-statistics-distribution/src/test/java/org/apache/commons/statistics/distribution/ZipfDistributionTest.java
@@ -27,12 +27,12 @@
  * Extends DiscreteDistributionAbstractTest.
  * See class javadoc for DiscreteDistributionAbstractTest for details.
  */
-public class ZipfDistributionTest extends DiscreteDistributionAbstractTest {
+class ZipfDistributionTest extends DiscreteDistributionAbstractTest {
 
     //---------------------- Override tolerance --------------------------------
 
     @BeforeEach
-    public void customSetUp() {
+    void customSetUp() {
         setTolerance(1e-12);
     }