This is an automated email from the ASF dual-hosted git repository.

aherbert pushed a commit to branch master
in repository https://gitbox.apache.org/repos/asf/commons-statistics.git

commit 6425b89d12fbe3f0458b9a637b0881e27434b71a
Author: aherbert <aherb...@apache.org>
AuthorDate: Mon Jun 29 15:34:53 2020 +0100

    Fix SonarCloud: Test scope for JUnit5 can be package-private
---
 .../AbstractContinuousDistributionTest.java        |  4 +--
 .../AbstractDiscreteDistributionTest.java          | 10 +++----
 .../distribution/BetaDistributionTest.java         | 16 +++++------
 .../distribution/BinomialDistributionTest.java     | 18 ++++++------
 .../distribution/CauchyDistributionTest.java       | 10 +++----
 .../distribution/ChiSquaredDistributionTest.java   | 12 ++++----
 .../ConstantContinuousDistributionTest.java        |  4 +--
 .../ContinuousDistributionAbstractTest.java        | 24 ++++++++--------
 .../distribution/ContinuousDistributionTest.java   |  2 +-
 .../DiscreteDistributionAbstractTest.java          | 20 +++++++-------
 .../distribution/DiscreteDistributionTest.java     |  2 +-
 .../distribution/ExponentialDistributionTest.java  | 14 +++++-----
 .../statistics/distribution/FDistributionTest.java | 18 ++++++------
 .../distribution/GammaDistributionTest.java        | 30 ++++++++++----------
 .../distribution/GeometricDistributionTest.java    |  8 +++---
 .../distribution/GumbelDistributionTest.java       | 10 +++----
 .../HypergeometricDistributionTest.java            | 32 +++++++++++-----------
 .../distribution/LaplaceDistributionTest.java      | 10 +++----
 .../distribution/LevyDistributionTest.java         |  6 ++--
 .../distribution/LogNormalDistributionTest.java    | 18 ++++++------
 .../distribution/LogisticsDistributionTest.java    | 10 +++----
 .../distribution/NakagamiDistributionTest.java     | 10 +++----
 .../distribution/NormalDistributionTest.java       | 22 +++++++--------
 .../distribution/ParetoDistributionTest.java       | 16 +++++------
 .../distribution/PascalDistributionTest.java       | 14 +++++-----
 .../distribution/PoissonDistributionTest.java      | 16 +++++------
 .../statistics/distribution/TDistributionTest.java | 16 +++++------
 .../distribution/TriangularDistributionTest.java   | 16 +++++------
 .../UniformContinuousDistributionTest.java         | 12 ++++----
 .../UniformDiscreteDistributionTest.java           | 10 +++----
 .../distribution/WeibullDistributionTest.java      | 12 ++++----
 .../distribution/ZipfDistributionTest.java         | 10 +++----
 32 files changed, 216 insertions(+), 216 deletions(-)

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 6251a64..d44ca18 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
@@ -26,7 +26,7 @@ import org.junit.jupiter.api.Test;
 public class AbstractContinuousDistributionTest {
 
     @Test
-    public void testContinuous() {
+    void testContinuous() {
         final double x0 = 0.0;
         final double x1 = 1.0;
         final double x2 = 2.0;
@@ -108,7 +108,7 @@ public class AbstractContinuousDistributionTest {
     }
 
     @Test
-    public void testDiscontinuous() {
+    void testDiscontinuous() {
         final double x0 = 0.0;
         final double x1 = 0.25;
         final double x2 = 0.5;
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 03c6a6b..44358c8 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
@@ -27,7 +27,7 @@ public class AbstractDiscreteDistributionTest {
     protected final double p = diceDistribution.probability(1);
 
     @Test
-    public void testInverseCumulativeProbabilityMethod() {
+    void testInverseCumulativeProbabilityMethod() {
         final double precision = 0.000000000000001;
         Assertions.assertEquals(1, 
diceDistribution.inverseCumulativeProbability(0));
         Assertions.assertEquals(1, 
diceDistribution.inverseCumulativeProbability((1d - Double.MIN_VALUE) / 6d));
@@ -45,7 +45,7 @@ public class AbstractDiscreteDistributionTest {
     }
 
     @Test
-    public void testCumulativeProbabilitiesSingleArguments() {
+    void testCumulativeProbabilitiesSingleArguments() {
         for (int i = 1; i < 7; i++) {
             Assertions.assertEquals(p * i,
                     diceDistribution.cumulativeProbability(i), 
Double.MIN_VALUE);
@@ -57,7 +57,7 @@ public class AbstractDiscreteDistributionTest {
     }
 
     @Test
-    public void testProbabilitiesRangeArguments() {
+    void testProbabilitiesRangeArguments() {
         int lower = 0;
         int upper = 6;
         for (int i = 0; i < 2; i++) {
@@ -73,7 +73,7 @@ public class AbstractDiscreteDistributionTest {
     }
 
     @Test
-    public void testInverseCumulativeProbabilityExtremes() {
+    void testInverseCumulativeProbabilityExtremes() {
         // Require a lower bound of MIN_VALUE and the cumulative probability
         // at that bound to be lower/higher than the argument cumulative 
probability.
         final DiscreteDistribution dist = new AbstractDiscreteDistribution() {
@@ -111,7 +111,7 @@ public class AbstractDiscreteDistributionTest {
     }
 
     @Test
-    public void testInverseCumulativeProbabilityWithNaN() {
+    void testInverseCumulativeProbabilityWithNaN() {
         final DiscreteDistribution dist = new AbstractDiscreteDistribution() {
             @Override
             public double probability(int x) {
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 8cbb2fa..71c9ace 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
@@ -31,7 +31,7 @@ public class BetaDistributionTest {
     static final double EPSILON = StatUtils.min(ALPHA_BETAS);
 
     @Test
-    public void testCumulative() {
+    void testCumulative() {
         final double[] x = new double[]{-0.1, 0.0, 0.1, 0.2, 0.3, 0.4, 0.5, 
0.6, 0.7, 0.8, 0.9, 1.0, 1.1};
         // all test data computed using R 2.5
         checkCumulative(0.1, 0.1,
@@ -161,7 +161,7 @@ public class BetaDistributionTest {
     }
 
     @Test
-    public void testDensity() {
+    void testDensity() {
         final double[] x = new double[]{1e-6, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 
0.7, 0.8, 0.9};
         checkDensity(0.1, 0.1,
                      x, new double[]{
@@ -301,7 +301,7 @@ public class BetaDistributionTest {
     }
 
     @Test
-    public void testDensityExtremes() {
+    void testDensityExtremes() {
         final BetaDistribution d = new BetaDistribution(2, 3);
         Assertions.assertEquals(Double.NEGATIVE_INFINITY, d.logDensity(-0.1));
         Assertions.assertEquals(Double.NEGATIVE_INFINITY, d.logDensity(1.1));
@@ -313,19 +313,19 @@ public class BetaDistributionTest {
     }
 
     @Test
-    public void testLogDensityPrecondition1() {
+    void testLogDensityPrecondition1() {
         final BetaDistribution d = new BetaDistribution(0.5, 3);
         Assertions.assertThrows(DistributionException.class, () -> 
d.logDensity(0.0));
     }
 
     @Test
-    public void testLogDensityPrecondition2() {
+    void testLogDensityPrecondition2() {
         final BetaDistribution d = new BetaDistribution(2, 0.5);
         Assertions.assertThrows(DistributionException.class, () -> 
d.logDensity(1.0));
     }
 
     @Test
-    public void testMoments() {
+    void testMoments() {
         final double tol = 1e-9;
         BetaDistribution dist;
 
@@ -339,7 +339,7 @@ public class BetaDistributionTest {
     }
 
     @Test
-    public void testMomentsSampling() {
+    void testMomentsSampling() {
         final UniformRandomProvider rng = 
RandomSource.create(RandomSource.WELL_1024_A,
                                                               123456789L);
         final int numSamples = 1000;
@@ -359,7 +359,7 @@ public class BetaDistributionTest {
     }
 
     @Test
-    public void testGoodnessOfFit() {
+    void testGoodnessOfFit() {
         final UniformRandomProvider rng = 
RandomSource.create(RandomSource.WELL_19937_A,
                                                               123456789L);
 
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 f927559..8ad6e36 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
@@ -94,7 +94,7 @@ public class BinomialDistributionTest extends 
DiscreteDistributionAbstractTest {
 
     /** Test degenerate case p = 0 */
     @Test
-    public void testDegenerate0() {
+    void testDegenerate0() {
         final BinomialDistribution dist = new BinomialDistribution(5, 0.0d);
         setDistribution(dist);
         setCumulativeTestPoints(new int[] {-1, 0, 1, 5, 10});
@@ -112,7 +112,7 @@ public class BinomialDistributionTest extends 
DiscreteDistributionAbstractTest {
 
     /** Test degenerate case p = 1 */
     @Test
-    public void testDegenerate1() {
+    void testDegenerate1() {
         final BinomialDistribution dist = new BinomialDistribution(5, 1.0d);
         setDistribution(dist);
         setCumulativeTestPoints(new int[] {-1, 0, 1, 2, 5, 10});
@@ -130,7 +130,7 @@ public class BinomialDistributionTest extends 
DiscreteDistributionAbstractTest {
 
     /** Test degenerate case n = 0 */
     @Test
-    public void testDegenerate2() {
+    void testDegenerate2() {
         final BinomialDistribution dist = new BinomialDistribution(0, 0.01d);
         setDistribution(dist);
         setCumulativeTestPoints(new int[] {-1, 0, 1, 2, 5, 10});
@@ -147,7 +147,7 @@ public class BinomialDistributionTest extends 
DiscreteDistributionAbstractTest {
     }
 
     @Test
-    public void testParameterAccessors() {
+    void testParameterAccessors() {
         for (final int n : new int[] {11, 42, 999}) {
             for (final double p : new double[] {0.1, 0.456, 0.999}) {
                 final BinomialDistribution dist = new BinomialDistribution(n, 
p);
@@ -158,22 +158,22 @@ public class BinomialDistributionTest extends 
DiscreteDistributionAbstractTest {
     }
 
     @Test
-    public void testConstructorPrecondition1() {
+    void testConstructorPrecondition1() {
         Assertions.assertThrows(DistributionException.class, () -> new 
BinomialDistribution(-1, 0.1));
     }
 
     @Test
-    public void testConstructorPrecondition2() {
+    void testConstructorPrecondition2() {
         Assertions.assertThrows(DistributionException.class, () -> new 
BinomialDistribution(10, -0.1));
     }
 
     @Test
-    public void testConstructorPrecondition3() {
+    void testConstructorPrecondition3() {
         Assertions.assertThrows(DistributionException.class, () -> new 
BinomialDistribution(10, 1.1));
     }
 
     @Test
-    public void testMoments() {
+    void testMoments() {
         final double tol = 1e-9;
         BinomialDistribution dist;
 
@@ -187,7 +187,7 @@ public class BinomialDistributionTest extends 
DiscreteDistributionAbstractTest {
     }
 
     @Test
-    public void testMath718() {
+    void testMath718() {
         // for large trials the evaluation of ContinuedFraction was inaccurate
         // do a sweep over several large trials to test if the current 
implementation is
         // numerically stable.
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 795de4c..3a17d78 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
@@ -70,31 +70,31 @@ public class CauchyDistributionTest extends 
ContinuousDistributionAbstractTest {
     //-------------------- Additional test cases 
-------------------------------
 
     @Test
-    public void testInverseCumulativeProbabilityExtremes() {
+    void testInverseCumulativeProbabilityExtremes() {
         setInverseCumulativeTestPoints(new double[] {0.0, 1.0});
         setInverseCumulativeTestValues(new double[] {Double.NEGATIVE_INFINITY, 
Double.POSITIVE_INFINITY});
         verifyInverseCumulativeProbabilities();
     }
 
     @Test
-    public void testParameterAccessors() {
+    void testParameterAccessors() {
         final CauchyDistribution distribution = makeDistribution();
         Assertions.assertEquals(1.2, distribution.getMedian());
         Assertions.assertEquals(2.1, distribution.getScale());
     }
 
     @Test
-    public void testConstructorPrecondition1() {
+    void testConstructorPrecondition1() {
         Assertions.assertThrows(DistributionException.class, () -> new 
CauchyDistribution(0, 0));
     }
 
     @Test
-    public void testConstructorPrecondition2() {
+    void testConstructorPrecondition2() {
         Assertions.assertThrows(DistributionException.class, () -> new 
CauchyDistribution(0, -1));
     }
 
     @Test
-    public void testMoments() {
+    void testMoments() {
         CauchyDistribution dist;
 
         dist = new CauchyDistribution(10.2, 0.15);
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 f6090c0..aec0eb0 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
@@ -82,7 +82,7 @@ public class ChiSquaredDistributionTest extends 
ContinuousDistributionAbstractTe
     //-------------------- Additional test cases 
-------------------------------
 
     @Test
-    public void testSmallDf() {
+    void testSmallDf() {
         setDistribution(new ChiSquaredDistribution(0.1d));
         setTolerance(1E-4);
         // quantiles computed using R version 1.8.1 (linux version)
@@ -96,23 +96,23 @@ public class ChiSquaredDistributionTest extends 
ContinuousDistributionAbstractTe
     }
 
     @Test
-    public void testParameterAccessors() {
+    void testParameterAccessors() {
         final ChiSquaredDistribution distribution = makeDistribution();
         Assertions.assertEquals(5d, distribution.getDegreesOfFreedom());
     }
 
     @Test
-    public void testConstructorPrecondition1() {
+    void testConstructorPrecondition1() {
         Assertions.assertThrows(DistributionException.class, () -> new 
ChiSquaredDistribution(0));
     }
 
     @Test
-    public void testConstructorPrecondition2() {
+    void testConstructorPrecondition2() {
         Assertions.assertThrows(DistributionException.class, () -> new 
ChiSquaredDistribution(-1));
     }
 
     @Test
-    public void testMoments() {
+    void testMoments() {
         final double tol = 1e-9;
         ChiSquaredDistribution dist;
 
@@ -126,7 +126,7 @@ public class ChiSquaredDistributionTest extends 
ContinuousDistributionAbstractTe
     }
 
     @Test
-    public void testDensity() {
+    void testDensity() {
         final double[] x = new double[]{-0.1, 1e-6, 0.5, 1, 2, 5};
         //R 2.5: print(dchisq(x, df=1), digits=10)
         checkDensity(1, x, new double[]{0.00000000000, 398.94208093034, 
0.43939128947, 0.24197072452, 0.10377687436, 0.01464498256});
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 0b700c4..65d7670 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
@@ -62,7 +62,7 @@ public class ConstantContinuousDistributionTest extends 
ContinuousDistributionAb
     /** Override default test, verifying that inverse cum is constant */
     @Override
     @Test
-    public void testInverseCumulativeProbabilities() {
+    void testInverseCumulativeProbabilities() {
         final ContinuousDistribution dist = getDistribution();
         for (final double x : getCumulativeTestValues()) {
             Assertions.assertEquals(1, dist.inverseCumulativeProbability(x));
@@ -72,7 +72,7 @@ public class ConstantContinuousDistributionTest extends 
ContinuousDistributionAb
     //-------------------- Additional test cases 
-------------------------------
 
     @Test
-    public void testMoments() {
+    void testMoments() {
         ConstantContinuousDistribution dist;
 
         dist = new ConstantContinuousDistribution(-1);
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 300f2e7..666bdbc 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
@@ -235,7 +235,7 @@ public abstract class ContinuousDistributionAbstractTest {
      * using default test instance data
      */
     @Test
-    public void testCumulativeProbabilities() {
+    void testCumulativeProbabilities() {
         verifyCumulativeProbabilities();
     }
 
@@ -244,7 +244,7 @@ public abstract class ContinuousDistributionAbstractTest {
      * using default test instance data
      */
     @Test
-    public void testInverseCumulativeProbabilities() {
+    void testInverseCumulativeProbabilities() {
         verifyInverseCumulativeProbabilities();
     }
 
@@ -253,7 +253,7 @@ public abstract class ContinuousDistributionAbstractTest {
      * for default test instance data
      */
     @Test
-    public void testDensities() {
+    void testDensities() {
         verifyDensities();
     }
 
@@ -262,7 +262,7 @@ public abstract class ContinuousDistributionAbstractTest {
      * for default test instance data
      */
     @Test
-    public void testLogDensities() {
+    void testLogDensities() {
         verifyLogDensities();
     }
 
@@ -270,7 +270,7 @@ public abstract class ContinuousDistributionAbstractTest {
      * Verifies that probability computations are consistent
      */
     @Test
-    public void testConsistency() {
+    void testConsistency() {
         for (int i = 1; i < cumulativeTestPoints.length; i++) {
 
             // check that cdf(x, x) = 0
@@ -293,20 +293,20 @@ public abstract class ContinuousDistributionAbstractTest {
      * Verifies that illegal arguments are correctly handled
      */
     @Test
-    public void testPrecondition1() {
+    void testPrecondition1() {
         Assertions.assertThrows(DistributionException.class, () -> 
distribution.probability(1, 0));
     }
     @Test
-    public void testPrecondition2() {
+    void testPrecondition2() {
         Assertions.assertThrows(DistributionException.class, () -> 
distribution.inverseCumulativeProbability(-1));
     }
     @Test
-    public void testPrecondition3() {
+    void testPrecondition3() {
         Assertions.assertThrows(DistributionException.class, () -> 
distribution.inverseCumulativeProbability(2));
     }
 
     @Test
-    public void testOutsideSupport() {
+    void testOutsideSupport() {
         // Test various quantities when the variable is outside the support.
         final double lo = distribution.getSupportLowerBound();
         final double hi = distribution.getSupportUpperBound();
@@ -325,7 +325,7 @@ public abstract class ContinuousDistributionAbstractTest {
      * Test sampling
      */
     @Test
-    public void testSampler() {
+    void testSampler() {
         final int sampleSize = 1000;
         final ContinuousDistribution.Sampler sampler =
             
distribution.createSampler(RandomSource.create(RandomSource.WELL_19937_C, 
123456789L));
@@ -349,7 +349,7 @@ public abstract class ContinuousDistributionAbstractTest {
      * are discarded.
      */
     @Test
-    public void testDensityIntegrals() {
+    void testDensityIntegrals() {
         final double tol = 1e-9;
         final BaseAbstractUnivariateIntegrator integrator =
             new IterativeLegendreGaussIntegrator(5, 1e-12, 1e-10);
@@ -386,7 +386,7 @@ public abstract class ContinuousDistributionAbstractTest {
      * then the support connected property is not used elsewhere in the 
standard tests.
      */
     @Test
-    public void testIsSupportConnected() {
+    void testIsSupportConnected() {
         Assertions.assertEquals(isSupportConnected(), 
distribution.isSupportConnected());
     }
 
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 e6d428a..c1136e8 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
@@ -28,7 +28,7 @@ public class ContinuousDistributionTest {
      * Test the default interface methods.
      */
     @Test
-    public void testDefaultMethods() {
+    void testDefaultMethods() {
         final double high = 0.54;
         final double low = 0.313;
 
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 08abf16..2281444 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
@@ -205,7 +205,7 @@ public abstract class DiscreteDistributionAbstractTest {
      * using default test instance data
      */
     @Test
-    public void testDensities() {
+    void testDensities() {
         verifyDensities();
     }
 
@@ -214,7 +214,7 @@ public abstract class DiscreteDistributionAbstractTest {
      * using default test instance data
      */
     @Test
-    public void testLogDensities() {
+    void testLogDensities() {
         verifyLogDensities();
     }
 
@@ -223,7 +223,7 @@ public abstract class DiscreteDistributionAbstractTest {
      * using default test instance data
      */
     @Test
-    public void testCumulativeProbabilities() {
+    void testCumulativeProbabilities() {
         verifyCumulativeProbabilities();
     }
 
@@ -232,12 +232,12 @@ public abstract class DiscreteDistributionAbstractTest {
      * using default test instance data
      */
     @Test
-    public void testInverseCumulativeProbabilities() {
+    void testInverseCumulativeProbabilities() {
         verifyInverseCumulativeProbabilities();
     }
 
     @Test
-    public void testConsistencyAtSupportBounds() {
+    void testConsistencyAtSupportBounds() {
         final int lower = distribution.getSupportLowerBound();
         Assertions.assertEquals(0.0, distribution.cumulativeProbability(lower 
- 1), 0.0,
                 "Cumulative probability mmust be 0 below support lower 
bound.");
@@ -256,15 +256,15 @@ public abstract class DiscreteDistributionAbstractTest {
     }
 
     @Test
-    public void testPrecondition1() {
+    void testPrecondition1() {
         Assertions.assertThrows(DistributionException.class, () -> 
distribution.probability(1, 0));
     }
     @Test
-    public void testPrecondition2() {
+    void testPrecondition2() {
         Assertions.assertThrows(DistributionException.class, () -> 
distribution.inverseCumulativeProbability(-1));
     }
     @Test
-    public void testPrecondition3() {
+    void testPrecondition3() {
         Assertions.assertThrows(DistributionException.class, () -> 
distribution.inverseCumulativeProbability(2));
     }
 
@@ -272,7 +272,7 @@ public abstract class DiscreteDistributionAbstractTest {
      * Test sampling
      */
     @Test
-    public void testSampling() {
+    void testSampling() {
         final int[] densityPoints = makeDensityTestPoints();
         final double[] densityValues = makeDensityTestValues();
         final int sampleSize = 1000;
@@ -303,7 +303,7 @@ public abstract class DiscreteDistributionAbstractTest {
      * connected property is tested.
      */
     @Test
-    public void testIsSupportConnected() {
+    void testIsSupportConnected() {
         Assertions.assertEquals(isSupportConnected(), 
distribution.isSupportConnected());
     }
 
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 a34a100..7ad409e 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
@@ -28,7 +28,7 @@ public class DiscreteDistributionTest {
      * Test the default interface methods.
      */
     @Test
-    public void testDefaultMethods() {
+    void testDefaultMethods() {
         final DiscreteDistribution dist = new DiscreteDistribution() {
             @Override
             public double probability(int x) {
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 0a1b6c6..de9e758 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
@@ -68,27 +68,27 @@ public class ExponentialDistributionTest extends 
ContinuousDistributionAbstractT
     //------------ Additional tests -------------------------------------------
 
     @Test
-    public void testCumulativeProbabilityExtremes() {
+    void testCumulativeProbabilityExtremes() {
         setCumulativeTestPoints(new double[] {-2, 0});
         setCumulativeTestValues(new double[] {0, 0});
         verifyCumulativeProbabilities();
     }
 
     @Test
-    public void testInverseCumulativeProbabilityExtremes() {
+    void testInverseCumulativeProbabilityExtremes() {
         setInverseCumulativeTestPoints(new double[] {0, 1});
         setInverseCumulativeTestValues(new double[] {0, 
Double.POSITIVE_INFINITY});
         verifyInverseCumulativeProbabilities();
     }
 
     @Test
-    public void testCumulativeProbability2() {
+    void testCumulativeProbability2() {
         final double actual = getDistribution().probability(0.25, 0.75);
         Assertions.assertEquals(0.0905214, actual, 10e-4);
     }
 
     @Test
-    public void testDensity() {
+    void testDensity() {
         final ExponentialDistribution d1 = new ExponentialDistribution(1);
         Assertions.assertTrue(Precision.equals(0.0, d1.density(-1e-9), 1));
         Assertions.assertTrue(Precision.equals(1.0, d1.density(0.0), 1));
@@ -106,18 +106,18 @@ public class ExponentialDistributionTest extends 
ContinuousDistributionAbstractT
     }
 
     @Test
-    public void testMeanAccessors() {
+    void testMeanAccessors() {
         final ExponentialDistribution distribution = makeDistribution();
         Assertions.assertEquals(5d, distribution.getMean());
     }
 
     @Test
-    public void testConstructorPrecondition1() {
+    void testConstructorPrecondition1() {
         Assertions.assertThrows(DistributionException.class, () -> new 
ExponentialDistribution(0));
     }
 
     @Test
-    public void testMoments() {
+    void testMoments() {
         final double tol = 1e-9;
         ExponentialDistribution dist;
 
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 a708e00..b303bce 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
@@ -66,37 +66,37 @@ public class FDistributionTest extends 
ContinuousDistributionAbstractTest {
     //-------------------- Additional test cases 
-------------------------------
 
     @Test
-    public void testCumulativeProbabilityExtremes() {
+    void testCumulativeProbabilityExtremes() {
         setCumulativeTestPoints(new double[] {-2, 0});
         setCumulativeTestValues(new double[] {0, 0});
         verifyCumulativeProbabilities();
     }
 
     @Test
-    public void testInverseCumulativeProbabilityExtremes() {
+    void testInverseCumulativeProbabilityExtremes() {
         setInverseCumulativeTestPoints(new double[] {0, 1});
         setInverseCumulativeTestValues(new double[] {0, 
Double.POSITIVE_INFINITY});
         verifyInverseCumulativeProbabilities();
     }
 
     @Test
-    public void testParameterAccessors() {
+    void testParameterAccessors() {
         final FDistribution dist = makeDistribution();
         Assertions.assertEquals(5d, dist.getNumeratorDegreesOfFreedom());
         Assertions.assertEquals(6d, dist.getDenominatorDegreesOfFreedom());
     }
 
     @Test
-    public void testConstructorPrecondition1() {
+    void testConstructorPrecondition1() {
         Assertions.assertThrows(DistributionException.class, () -> new 
FDistribution(0, 1));
     }
     @Test
-    public void testConstructorPrecondition2() {
+    void testConstructorPrecondition2() {
         Assertions.assertThrows(DistributionException.class, () -> new 
FDistribution(1, 0));
     }
 
     @Test
-    public void testMoments() {
+    void testMoments() {
         final double tol = 1e-9;
         FDistribution dist;
 
@@ -114,7 +114,7 @@ public class FDistributionTest extends 
ContinuousDistributionAbstractTest {
     }
 
     @Test
-    public void testLargeDegreesOfFreedom() {
+    void testLargeDegreesOfFreedom() {
         final FDistribution fd = new FDistribution(100000, 100000);
         final double p = fd.cumulativeProbability(.999);
         final double x = fd.inverseCumulativeProbability(p);
@@ -122,7 +122,7 @@ public class FDistributionTest extends 
ContinuousDistributionAbstractTest {
     }
 
     @Test
-    public void testSmallDegreesOfFreedom() {
+    void testSmallDegreesOfFreedom() {
         FDistribution fd = new FDistribution(1, 1);
         double p = fd.cumulativeProbability(0.975);
         double x = fd.inverseCumulativeProbability(p);
@@ -135,7 +135,7 @@ public class FDistributionTest extends 
ContinuousDistributionAbstractTest {
     }
 
     @Test
-    public void testMath785() {
+    void testMath785() {
         // this test was failing due to inaccurate results from 
ContinuedFraction.
         final double prob = 0.01;
         final FDistribution f = new FDistribution(200000, 200000);
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 7bf8b62..2ebf952 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
@@ -76,23 +76,23 @@ public class GammaDistributionTest extends 
ContinuousDistributionAbstractTest {
     //-------------------- Additional test cases 
-------------------------------
 
     @Test
-    public void testParameterAccessors() {
+    void testParameterAccessors() {
         final GammaDistribution distribution = makeDistribution();
         Assertions.assertEquals(4d, distribution.getShape());
         Assertions.assertEquals(2d, distribution.getScale());
     }
 
     @Test
-    public void testConstructorPrecondition1() {
+    void testConstructorPrecondition1() {
         Assertions.assertThrows(DistributionException.class, () -> new 
GammaDistribution(0, 1));
     }
     @Test
-    public void testConstructorPrecondition2() {
+    void testConstructorPrecondition2() {
         Assertions.assertThrows(DistributionException.class, () -> new 
GammaDistribution(1, 0));
     }
 
     @Test
-    public void testMoments() {
+    void testMoments() {
         final double tol = 1e-9;
         GammaDistribution dist;
 
@@ -106,7 +106,7 @@ public class GammaDistributionTest extends 
ContinuousDistributionAbstractTest {
     }
 
     @Test
-    public void testProbabilities() {
+    void testProbabilities() {
         testProbability(-1.000, 4.0, 2.0, .0000);
         testProbability(15.501, 4.0, 2.0, .9499);
         testProbability(0.504, 4.0, 1.0, .0018);
@@ -115,7 +115,7 @@ public class GammaDistributionTest extends 
ContinuousDistributionAbstractTest {
     }
 
     @Test
-    public void testValues() {
+    void testValues() {
         testValue(15.501, 4.0, 2.0, .9499);
         testValue(0.504, 4.0, 1.0, .0018);
         testValue(10.011, 1.0, 2.0, .9933);
@@ -135,7 +135,7 @@ public class GammaDistributionTest extends 
ContinuousDistributionAbstractTest {
     }
 
     @Test
-    public void testDensity() {
+    void testDensity() {
         final double[] x = new double[]{-0.1, 1e-6, 0.5, 1, 2, 5};
         // R2.5: print(dgamma(x, shape=1, rate=1), digits=10)
         checkDensity(1, 1, x, new double[]{0.000000000000, 0.999999000001, 
0.606530659713, 0.367879441171, 0.135335283237, 0.006737946999});
@@ -166,7 +166,7 @@ public class GammaDistributionTest extends 
ContinuousDistributionAbstractTest {
     }
 
     @Test
-    public void testLogDensity() {
+    void testLogDensity() {
         final double[] x = new double[]{-0.1, 1e-6, 0.5, 1, 2, 5};
         final double inf = Double.POSITIVE_INFINITY;
         // R2.5: print(dgamma(x, shape=1, rate=1, log=TRUE), digits=10)
@@ -198,7 +198,7 @@ public class GammaDistributionTest extends 
ContinuousDistributionAbstractTest {
     }
 
     @Test
-    public void testInverseCumulativeProbabilityExtremes() {
+    void testInverseCumulativeProbabilityExtremes() {
         setInverseCumulativeTestPoints(new double[] {0, 1});
         setInverseCumulativeTestValues(new double[] {0, 
Double.POSITIVE_INFINITY});
         verifyInverseCumulativeProbabilities();
@@ -351,34 +351,34 @@ public class GammaDistributionTest extends 
ContinuousDistributionAbstractTest {
     }
 
     @Test
-    public void testMath753Shape1() throws IOException {
+    void testMath753Shape1() throws IOException {
         doTestMath753(1.0, 1.5, 0.5, 0.0, 0.0, 
"gamma-distribution-shape-1.csv");
     }
 
     @Test
-    public void testMath753Shape8() throws IOException {
+    void testMath753Shape8() throws IOException {
         doTestMath753(8.0, 1.5, 1.0, 0.0, 0.0, 
"gamma-distribution-shape-8.csv");
     }
 
     @Test
-    public void testMath753Shape10() throws IOException {
+    void testMath753Shape10() throws IOException {
         doTestMath753(10.0, 1.0, 1.0, 0.0, 0.0, 
"gamma-distribution-shape-10.csv");
     }
 
     @Test
-    public void testMath753Shape100() throws IOException {
+    void testMath753Shape100() throws IOException {
         // XXX Increased tolerance ("1.5" -> "2.0") to make test pass with JDK 
"Math"
         // where CM used "FastMath" (cf. "XXX" comment in main source code).
         doTestMath753(100.0, 2.0, 1.0, 0.0, 0.0, 
"gamma-distribution-shape-100.csv");
     }
 
     @Test
-    public void testMath753Shape142() throws IOException {
+    void testMath753Shape142() throws IOException {
         doTestMath753(142.0, 3.3, 1.6, 40.0, 40.0, 
"gamma-distribution-shape-142.csv");
     }
 
     @Test
-    public void testMath753Shape1000() throws IOException {
+    void testMath753Shape1000() throws IOException {
         // XXX Increased tolerance ("220.0" -> "230.0") to make test pass with 
JDK "Math"
         // where CM used "FastMath" (cf. "XXX" comment in main source code).
         doTestMath753(1000.0, 1.0, 1.0, 160.0, 230.0, 
"gamma-distribution-shape-1000.csv");
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 c098857..129feed 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
@@ -156,7 +156,7 @@ public class GeometricDistributionTest extends 
DiscreteDistributionAbstractTest
     //-------------------- Additional test cases 
-------------------------------
 
     @Test
-    public void testParameterAccessors() {
+    void testParameterAccessors() {
         for (final double x : new double[] {0.1, 0.456, 0.999}) {
             final GeometricDistribution dist = new GeometricDistribution(x);
             Assertions.assertEquals(x, dist.getProbabilityOfSuccess());
@@ -164,17 +164,17 @@ public class GeometricDistributionTest extends 
DiscreteDistributionAbstractTest
     }
 
     @Test
-    public void testConstructorPrecondition1() {
+    void testConstructorPrecondition1() {
         Assertions.assertThrows(DistributionException.class, () -> new 
GeometricDistribution(-0.1));
     }
 
     @Test
-    public void testConstructorPrecondition2() {
+    void testConstructorPrecondition2() {
         Assertions.assertThrows(DistributionException.class, () -> new 
GeometricDistribution(1.1));
     }
 
     @Test
-    public void testMoments() {
+    void testMoments() {
         final double tol = 1e-9;
         GeometricDistribution dist;
 
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 cceff20..abc0612 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
@@ -57,26 +57,26 @@ public class GumbelDistributionTest extends 
ContinuousDistributionAbstractTest {
     //-------------------- Additional test cases 
-------------------------------
 
     @Test
-    public void testInverseCumulativeProbabilityExtremes() {
+    void testInverseCumulativeProbabilityExtremes() {
         setInverseCumulativeTestPoints(new double[] {0.0, 1.0});
         setInverseCumulativeTestValues(new double[] {Double.NEGATIVE_INFINITY, 
Double.POSITIVE_INFINITY});
         verifyInverseCumulativeProbabilities();
     }
 
     @Test
-    public void testParameterAccessors() {
+    void testParameterAccessors() {
         final GumbelDistribution d = makeDistribution();
         Assertions.assertEquals(0.5, d.getLocation());
         Assertions.assertEquals(2, d.getScale());
     }
 
     @Test
-    public void testConstructorPrecondition1() {
+    void testConstructorPrecondition1() {
         Assertions.assertThrows(DistributionException.class, () -> new 
GumbelDistribution(10, -0.1));
     }
 
     @Test
-    public void testMoments() {
+    void testMoments() {
         final double tol = 1e-9;
         GumbelDistribution dist;
 
@@ -90,7 +90,7 @@ public class GumbelDistributionTest extends 
ContinuousDistributionAbstractTest {
     }
 
     @Test
-    public void testSupport() {
+    void testSupport() {
         final GumbelDistribution d = makeDistribution();
         Assertions.assertEquals(Double.NEGATIVE_INFINITY, 
d.getSupportLowerBound());
         Assertions.assertEquals(Double.POSITIVE_INFINITY, 
d.getSupportUpperBound());
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 a5aa9d9..a142d2c 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
@@ -105,7 +105,7 @@ public class HypergeometricDistributionTest extends 
DiscreteDistributionAbstract
 
     /** Verify that if there are no failures, mass is concentrated on 
sampleSize */
     @Test
-    public void testDegenerateNoFailures() {
+    void testDegenerateNoFailures() {
         final HypergeometricDistribution dist = new 
HypergeometricDistribution(5, 5, 3);
         setDistribution(dist);
         setCumulativeTestPoints(new int[] {-1, 0, 1, 3, 10 });
@@ -123,7 +123,7 @@ public class HypergeometricDistributionTest extends 
DiscreteDistributionAbstract
 
     /** Verify that if there are no successes, mass is concentrated on 0 */
     @Test
-    public void testDegenerateNoSuccesses() {
+    void testDegenerateNoSuccesses() {
         final HypergeometricDistribution dist = new 
HypergeometricDistribution(5, 0, 3);
         setDistribution(dist);
         setCumulativeTestPoints(new int[] {-1, 0, 1, 3, 10 });
@@ -141,7 +141,7 @@ public class HypergeometricDistributionTest extends 
DiscreteDistributionAbstract
 
     /** Verify that if sampleSize = populationSize, mass is concentrated on 
numberOfSuccesses */
     @Test
-    public void testDegenerateFullSample() {
+    void testDegenerateFullSample() {
         final HypergeometricDistribution dist = new 
HypergeometricDistribution(5, 3, 5);
         setDistribution(dist);
         setCumulativeTestPoints(new int[] {-1, 0, 1, 3, 10 });
@@ -158,7 +158,7 @@ public class HypergeometricDistributionTest extends 
DiscreteDistributionAbstract
     }
 
     @Test
-    public void testParameterAccessors() {
+    void testParameterAccessors() {
         final HypergeometricDistribution dist = new 
HypergeometricDistribution(5, 3, 4);
         Assertions.assertEquals(5, dist.getPopulationSize());
         Assertions.assertEquals(3, dist.getNumberOfSuccesses());
@@ -166,28 +166,28 @@ public class HypergeometricDistributionTest extends 
DiscreteDistributionAbstract
     }
 
     @Test
-    public void testConstructorPrecondition1() {
+    void testConstructorPrecondition1() {
         Assertions.assertThrows(DistributionException.class, () -> new 
HypergeometricDistribution(0, 3, 5));
     }
     @Test
-    public void testConstructorPrecondition2() {
+    void testConstructorPrecondition2() {
         Assertions.assertThrows(DistributionException.class, () -> new 
HypergeometricDistribution(5, -1, 5));
     }
     @Test
-    public void testConstructorPrecondition3() {
+    void testConstructorPrecondition3() {
         Assertions.assertThrows(DistributionException.class, () -> new 
HypergeometricDistribution(5, 3, -1));
     }
     @Test
-    public void testConstructorPrecondition4() {
+    void testConstructorPrecondition4() {
         Assertions.assertThrows(DistributionException.class, () -> new 
HypergeometricDistribution(5, 6, 5));
     }
     @Test
-    public void testConstructorPrecondition5() {
+    void testConstructorPrecondition5() {
         Assertions.assertThrows(DistributionException.class, () -> new 
HypergeometricDistribution(5, 3, 6));
     }
 
     @Test
-    public void testMoments() {
+    void testMoments() {
         final double tol = 1e-9;
         HypergeometricDistribution dist;
 
@@ -201,7 +201,7 @@ public class HypergeometricDistributionTest extends 
DiscreteDistributionAbstract
     }
 
     @Test
-    public void testLargeValues() {
+    void testLargeValues() {
         final int populationSize = 3456;
         final int sampleSize = 789;
         final int numberOfSucceses = 101;
@@ -251,7 +251,7 @@ public class HypergeometricDistributionTest extends 
DiscreteDistributionAbstract
     }
 
     @Test
-    public void testMoreLargeValues() {
+    void testMoreLargeValues() {
         final int populationSize = 26896;
         final int sampleSize = 895;
         final int numberOfSucceses = 55;
@@ -279,7 +279,7 @@ public class HypergeometricDistributionTest extends 
DiscreteDistributionAbstract
     }
 
     @Test
-    public void testMath644() {
+    void testMath644() {
         final int N = 14761461;  // population
         final int m = 1035;      // successes in population
         final int n = 1841;      // number of trials
@@ -296,7 +296,7 @@ public class HypergeometricDistributionTest extends 
DiscreteDistributionAbstract
     }
 
     @Test
-    public void testZeroTrial() {
+    void testZeroTrial() {
         final int n = 11; // population
         final int m = 4;  // successes in population
         final int s = 0;  // number of trials
@@ -310,7 +310,7 @@ public class HypergeometricDistributionTest extends 
DiscreteDistributionAbstract
     }
 
     @Test
-    public void testMath1356() {
+    void testMath1356() {
         final int n = 11;  // population
         final int m = 11;  // successes in population
 
@@ -322,7 +322,7 @@ public class HypergeometricDistributionTest extends 
DiscreteDistributionAbstract
     }
 
     @Test
-    public void testMath1021() {
+    void testMath1021() {
         final int N = 43130568;
         final int m = 42976365;
         final int n = 50;
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 1b9ee31..5cf85e5 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
@@ -57,26 +57,26 @@ public class LaplaceDistributionTest extends 
ContinuousDistributionAbstractTest
     //-------------------- Additional test cases 
-------------------------------
 
     @Test
-    public void testInverseCumulativeProbabilityExtremes() {
+    void testInverseCumulativeProbabilityExtremes() {
         setInverseCumulativeTestPoints(new double[] {0.0, 1.0});
         setInverseCumulativeTestValues(new double[] {Double.NEGATIVE_INFINITY, 
Double.POSITIVE_INFINITY});
         verifyInverseCumulativeProbabilities();
     }
 
     @Test
-    public void testParameterAccessors() {
+    void testParameterAccessors() {
         final LaplaceDistribution d = makeDistribution();
         Assertions.assertEquals(0, d.getLocation());
         Assertions.assertEquals(1, d.getScale());
     }
 
     @Test
-    public void testConstructorPrecondition1() {
+    void testConstructorPrecondition1() {
         Assertions.assertThrows(DistributionException.class, () -> new 
LaplaceDistribution(0, -0.1));
     }
 
     @Test
-    public void testMoments() {
+    void testMoments() {
         LaplaceDistribution dist;
 
         dist = new LaplaceDistribution(0.5, 1.0);
@@ -89,7 +89,7 @@ public class LaplaceDistributionTest extends 
ContinuousDistributionAbstractTest
     }
 
     @Test
-    public void testSupport() {
+    void testSupport() {
         final LaplaceDistribution d = makeDistribution();
         Assertions.assertEquals(Double.NEGATIVE_INFINITY, 
d.getSupportLowerBound());
         Assertions.assertEquals(Double.POSITIVE_INFINITY, 
d.getSupportUpperBound());
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 7dae2db..a1fa752 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
@@ -68,14 +68,14 @@ public class LevyDistributionTest extends 
ContinuousDistributionAbstractTest {
     //-------------------- Additional test cases 
-------------------------------
 
     @Test
-    public void testParameterAccessors() {
+    void testParameterAccessors() {
         final LevyDistribution d = makeDistribution();
         Assertions.assertEquals(1.2, d.getLocation());
         Assertions.assertEquals(0.4, d.getScale());
     }
 
     @Test
-    public void testMoments() {
+    void testMoments() {
         LevyDistribution dist;
 
         dist = new LevyDistribution(0, 0.5);
@@ -92,7 +92,7 @@ public class LevyDistributionTest extends 
ContinuousDistributionAbstractTest {
     }
 
     @Test
-    public void testSupport() {
+    void testSupport() {
         final LevyDistribution d = makeDistribution();
         Assertions.assertEquals(d.getLocation(), d.getSupportLowerBound());
         Assertions.assertEquals(Double.POSITIVE_INFINITY, 
d.getSupportUpperBound());
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 768ef24..c19f33d 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
@@ -116,7 +116,7 @@ public class LogNormalDistributionTest extends 
ContinuousDistributionAbstractTes
     }
 
     @Test
-    public void testQuantiles() {
+    void testQuantiles() {
         setCumulativeTestValues(new double[] {0, 0.0396495152787,
                                               0.16601209243, 0.272533253269,
                                               0.357618409638, 0.426488363093,
@@ -153,14 +153,14 @@ public class LogNormalDistributionTest extends 
ContinuousDistributionAbstractTes
     }
 
     @Test
-    public void testInverseCumulativeProbabilityExtremes() {
+    void testInverseCumulativeProbabilityExtremes() {
         setInverseCumulativeTestPoints(new double[] {0, 1});
         setInverseCumulativeTestValues(new double[] {0, 
Double.POSITIVE_INFINITY});
         verifyInverseCumulativeProbabilities();
     }
 
     @Test
-    public void testCumulativeProbabilityExtremes() {
+    void testCumulativeProbabilityExtremes() {
         // Use a small shape parameter so that we can exceed 40 * shape
         setDistribution(new LogNormalDistribution(1, 0.0001));
         setCumulativeTestPoints(new double[] {0.5, 10});
@@ -169,19 +169,19 @@ public class LogNormalDistributionTest extends 
ContinuousDistributionAbstractTes
     }
 
     @Test
-    public void testParameterAccessors() {
+    void testParameterAccessors() {
         final LogNormalDistribution distribution = 
(LogNormalDistribution)getDistribution();
         Assertions.assertEquals(2.1, distribution.getScale());
         Assertions.assertEquals(1.4, distribution.getShape());
     }
 
     @Test
-    public void testConstructorPrecondition1() {
+    void testConstructorPrecondition1() {
         Assertions.assertThrows(DistributionException.class, () -> new 
LogNormalDistribution(1, 0));
     }
 
     @Test
-    public void testMoments() {
+    void testMoments() {
         final double tol = 1e-9;
         LogNormalDistribution dist;
 
@@ -199,7 +199,7 @@ public class LogNormalDistributionTest extends 
ContinuousDistributionAbstractTes
     }
 
     @Test
-    public void testDensity() {
+    void testDensity() {
         final double[] x = new double[]{-2, -1, 0, 1, 2};
         // R 2.13: print(dlnorm(c(-2,-1,0,1,2)), digits=10)
         checkDensity(0, 1, x, new double[] {0.0000000000, 0.0000000000,
@@ -226,7 +226,7 @@ public class LogNormalDistributionTest extends 
ContinuousDistributionAbstractTes
      * Verifies fixes for JIRA MATH-167, MATH-414
      */
     @Test
-    public void testExtremeValues() {
+    void testExtremeValues() {
         final LogNormalDistribution d = new LogNormalDistribution(0, 1);
         for (int i = 0; i < 1e5; i++) { // make sure no convergence exception
             final double upperTail = d.cumulativeProbability(i);
@@ -244,7 +244,7 @@ public class LogNormalDistributionTest extends 
ContinuousDistributionAbstractTes
     }
 
     @Test
-    public void testTinyVariance() {
+    void testTinyVariance() {
         final LogNormalDistribution dist = new LogNormalDistribution(0, 1e-9);
         final double t = dist.getVariance();
         Assertions.assertEquals(1e-18, t, 1e-20);
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 1cafb5d..1444433 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
@@ -57,26 +57,26 @@ public class LogisticsDistributionTest extends 
ContinuousDistributionAbstractTes
     //-------------------- Additional test cases 
-------------------------------
 
     @Test
-    public void testInverseCumulativeProbabilityExtremes() {
+    void testInverseCumulativeProbabilityExtremes() {
         setInverseCumulativeTestPoints(new double[] {0, 1});
         setInverseCumulativeTestValues(new double[] {0, 
Double.POSITIVE_INFINITY});
         verifyInverseCumulativeProbabilities();
     }
 
     @Test
-    public void testParametersAccessors() {
+    void testParametersAccessors() {
         final LogisticDistribution d = makeDistribution();
         Assertions.assertEquals(2, d.getLocation());
         Assertions.assertEquals(5, d.getScale());
     }
 
     @Test
-    public void testConstructorPrecondition1() {
+    void testConstructorPrecondition1() {
         Assertions.assertThrows(DistributionException.class, () -> new 
LogisticDistribution(1, 0));
     }
 
     @Test
-    public void testMeanAndVariance() {
+    void testMeanAndVariance() {
         final LogisticDistribution d = makeDistribution();
         // Constructor 'location' parameter = mean
         Assertions.assertEquals(2.0, d.getMean());
@@ -86,7 +86,7 @@ public class LogisticsDistributionTest extends 
ContinuousDistributionAbstractTes
     }
 
     @Test
-    public void testSupport() {
+    void testSupport() {
         final LogisticDistribution d = makeDistribution();
         Assertions.assertEquals(Double.NEGATIVE_INFINITY, 
d.getSupportLowerBound());
         Assertions.assertEquals(Double.POSITIVE_INFINITY, 
d.getSupportUpperBound());
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 a8f1793..4a5f151 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
@@ -57,24 +57,24 @@ public class NakagamiDistributionTest extends 
ContinuousDistributionAbstractTest
     //-------------------- Additional test cases 
-------------------------------
 
     @Test
-    public void testParameterAccessors() {
+    void testParameterAccessors() {
         final NakagamiDistribution d = makeDistribution();
         Assertions.assertEquals(0.5, d.getShape());
         Assertions.assertEquals(1, d.getScale());
     }
 
     @Test
-    public void testConstructorPrecondition1() {
+    void testConstructorPrecondition1() {
         Assertions.assertThrows(DistributionException.class, () -> new 
NakagamiDistribution(0.4999, 1.0));
     }
 
     @Test
-    public void testConstructorPrecondition2() {
+    void testConstructorPrecondition2() {
         Assertions.assertThrows(DistributionException.class, () -> new 
NakagamiDistribution(0.5, 0.0));
     }
 
     @Test
-    public void testMoments() {
+    void testMoments() {
         // Values obtained using Matlab, e.g.
         // format long;
         // pd = makedist('Nakagami','mu',0.5,'omega',1.0);
@@ -92,7 +92,7 @@ public class NakagamiDistributionTest extends 
ContinuousDistributionAbstractTest
     }
 
     @Test
-    public void testSupport() {
+    void testSupport() {
         final NakagamiDistribution d = makeDistribution();
         Assertions.assertEquals(0, d.getSupportLowerBound());
         Assertions.assertEquals(Double.POSITIVE_INFINITY, 
d.getSupportUpperBound());
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 603e41d..5b37c29 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
@@ -85,7 +85,7 @@ public class NormalDistributionTest extends 
ContinuousDistributionAbstractTest {
     }
 
     @Test
-    public void testQuantiles() {
+    void testQuantiles() {
         setDensityTestValues(new double[] {0.0385649760808, 0.172836231799, 
0.284958771715, 0.172836231799, 0.0385649760808,
                                            0.00316560600853, 
9.55930184035e-05, 1.06194251052e-06});
         verifyQuantiles();
@@ -105,7 +105,7 @@ public class NormalDistributionTest extends 
ContinuousDistributionAbstractTest {
     }
 
     @Test
-    public void testInverseCumulativeProbabilityExtremes() {
+    void testInverseCumulativeProbabilityExtremes() {
         setInverseCumulativeTestPoints(new double[] {0, 1});
         setInverseCumulativeTestValues(new double[] {Double.NEGATIVE_INFINITY, 
Double.POSITIVE_INFINITY});
         verifyInverseCumulativeProbabilities();
@@ -113,7 +113,7 @@ public class NormalDistributionTest extends 
ContinuousDistributionAbstractTest {
 
     // MATH-1257
     @Test
-    public void testCumulativeProbability() {
+    void testCumulativeProbability() {
         final ContinuousDistribution dist = new NormalDistribution(0, 1);
         final double x = -10;
         final double expected = 7.61985e-24;
@@ -123,19 +123,19 @@ public class NormalDistributionTest extends 
ContinuousDistributionAbstractTest {
     }
 
     @Test
-    public void testParameterAccessors() {
+    void testParameterAccessors() {
         final NormalDistribution distribution = makeDistribution();
         Assertions.assertEquals(2.1, distribution.getMean());
         Assertions.assertEquals(1.4, distribution.getStandardDeviation());
     }
 
     @Test
-    public void testConstructorPrecondition1() {
+    void testConstructorPrecondition1() {
         Assertions.assertThrows(DistributionException.class, () -> new 
NormalDistribution(1, 0));
     }
 
     @Test
-    public void testMoments() {
+    void testMoments() {
         final double tol = 1e-9;
         NormalDistribution dist;
 
@@ -153,7 +153,7 @@ public class NormalDistributionTest extends 
ContinuousDistributionAbstractTest {
     }
 
     @Test
-    public void testDensity() {
+    void testDensity() {
         final double[] x = new double[] {-2, -1, 0, 1, 2};
         // R 2.5: print(dnorm(c(-2,-1,0,1,2)), digits=10)
         checkDensity(0, 1, x, new double[] {0.05399096651, 0.24197072452, 
0.39894228040, 0.24197072452, 0.05399096651});
@@ -173,7 +173,7 @@ public class NormalDistributionTest extends 
ContinuousDistributionAbstractTest {
      * Verifies fixes for JIRA MATH-167, MATH-414
      */
     @Test
-    public void testLowerTail() {
+    void testLowerTail() {
         final NormalDistribution distribution = new NormalDistribution(0, 1);
         for (int i = 0; i < 100; i++) { // make sure no convergence exception
             final double lowerTail = distribution.cumulativeProbability(-i);
@@ -190,7 +190,7 @@ public class NormalDistributionTest extends 
ContinuousDistributionAbstractTest {
      * Verifies fixes for JIRA MATH-167, MATH-414
      */
     @Test
-    public void testUpperTail() {
+    void testUpperTail() {
         final NormalDistribution distribution = new NormalDistribution(0, 1);
         for (int i = 0; i < 100; i++) { // make sure no convergence exception
             final double upperTail = distribution.cumulativeProbability(i);
@@ -203,7 +203,7 @@ public class NormalDistributionTest extends 
ContinuousDistributionAbstractTest {
     }
 
     @Test
-    public void testExtremeValues() {
+    void testExtremeValues() {
         final NormalDistribution distribution = new NormalDistribution(0, 1);
 
         Assertions.assertEquals(1, 
distribution.cumulativeProbability(Double.MAX_VALUE));
@@ -213,7 +213,7 @@ public class NormalDistributionTest extends 
ContinuousDistributionAbstractTest {
     }
 
     @Test
-    public void testMath280() {
+    void testMath280() {
         final NormalDistribution normal = new NormalDistribution(0, 1);
         double result = 
normal.inverseCumulativeProbability(0.9986501019683698);
         Assertions.assertEquals(3.0, result, 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 1954986..2074c42 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
@@ -104,7 +104,7 @@ public class ParetoDistributionTest extends 
ContinuousDistributionAbstractTest {
     }
 
     @Test
-    public void testQuantiles() {
+    void testQuantiles() {
         setCumulativeTestValues(new double[] {0, 0, 0, 0.510884134236, 
0.694625688662, 0.785201995008, 0.837811522357, 0.871634279326});
         setDensityTestValues(new double[] {0, 0, 0.666666666, 0.195646346305, 
0.0872498032394, 0.0477328899983, 0.0294888141169, 0.0197485724114});
         verifyQuantiles();
@@ -124,31 +124,31 @@ public class ParetoDistributionTest extends 
ContinuousDistributionAbstractTest {
     }
 
     @Test
-    public void testInverseCumulativeProbabilityExtremes() {
+    void testInverseCumulativeProbabilityExtremes() {
         setInverseCumulativeTestPoints(new double[] {0, 1});
         setInverseCumulativeTestValues(new double[] {2.1, 
Double.POSITIVE_INFINITY});
         verifyInverseCumulativeProbabilities();
     }
 
     @Test
-    public void testParameterAccessors() {
+    void testParameterAccessors() {
         final ParetoDistribution distribution = 
(ParetoDistribution)getDistribution();
         Assertions.assertEquals(2.1, distribution.getScale());
         Assertions.assertEquals(1.4, distribution.getShape());
     }
 
     @Test
-    public void testConstructorPrecondition1() {
+    void testConstructorPrecondition1() {
         Assertions.assertThrows(DistributionException.class, () -> new 
ParetoDistribution(1, 0));
     }
 
     @Test
-    public void testConstructorPrecondition2() {
+    void testConstructorPrecondition2() {
         Assertions.assertThrows(DistributionException.class, () -> new 
ParetoDistribution(0, 1));
     }
 
     @Test
-    public void testMoments() {
+    void testMoments() {
         final double tol = 1e-9;
         ParetoDistribution dist;
 
@@ -162,7 +162,7 @@ public class ParetoDistributionTest extends 
ContinuousDistributionAbstractTest {
     }
 
     @Test
-    public void testDensity() {
+    void testDensity() {
         final double[] x = new double[] {-2, -1, 0, 1, 2};
         // R 2.14: print(dpareto(c(-2,-1,0,1,2), scale=1, shape=1), digits=10)
         checkDensity(1, 1, x, new double[] {0.00, 0.00, 0.00, 1.00, 0.25});
@@ -182,7 +182,7 @@ public class ParetoDistributionTest extends 
ContinuousDistributionAbstractTest {
      * Check to make sure top-coding of extreme values works correctly.
      */
     @Test
-    public void testExtremeValues() {
+    void testExtremeValues() {
         final ParetoDistribution d = new ParetoDistribution(1, 1);
         for (int i = 0; i < 1e5; i++) { // make sure no convergence exception
             final double upperTail = d.cumulativeProbability(i);
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 d9cd08b..446a7ef 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
@@ -89,7 +89,7 @@ public class PascalDistributionTest extends 
DiscreteDistributionAbstractTest {
 
     /** Test degenerate case p = 0   */
     @Test
-    public void testDegenerate0() {
+    void testDegenerate0() {
         setDistribution(new PascalDistribution(5, 0.0d));
         setCumulativeTestPoints(new int[] {-1, 0, 1, 5, 10 });
         setCumulativeTestValues(new double[] {0d, 0d, 0d, 0d, 0d});
@@ -104,7 +104,7 @@ public class PascalDistributionTest extends 
DiscreteDistributionAbstractTest {
 
     /** Test degenerate case p = 1   */
     @Test
-    public void testDegenerate1() {
+    void testDegenerate1() {
         setDistribution(new PascalDistribution(5, 1.0d));
         setCumulativeTestPoints(new int[] {-1, 0, 1, 2, 5, 10 });
         setCumulativeTestValues(new double[] {0d, 1d, 1d, 1d, 1d, 1d});
@@ -118,29 +118,29 @@ public class PascalDistributionTest extends 
DiscreteDistributionAbstractTest {
     }
 
     @Test
-    public void testParameterAccessors() {
+    void testParameterAccessors() {
         final PascalDistribution distribution = makeDistribution();
         Assertions.assertEquals(10, distribution.getNumberOfSuccesses());
         Assertions.assertEquals(0.7, distribution.getProbabilityOfSuccess());
     }
 
     @Test
-    public void testConstructorPrecondition1() {
+    void testConstructorPrecondition1() {
         Assertions.assertThrows(DistributionException.class, () -> new 
PascalDistribution(0, 0.5));
     }
 
     @Test
-    public void testConstructorPrecondition2() {
+    void testConstructorPrecondition2() {
         Assertions.assertThrows(DistributionException.class, () -> new 
PascalDistribution(3, -0.1));
     }
 
     @Test
-    public void testConstructorPrecondition3() {
+    void testConstructorPrecondition3() {
         Assertions.assertThrows(DistributionException.class, () -> new 
PascalDistribution(3, 1.1));
     }
 
     @Test
-    public void testMoments() {
+    void testMoments() {
         final double tol = 1e-9;
         PascalDistribution dist;
 
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 008d938..a2351ad 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
@@ -127,7 +127,7 @@ public class PoissonDistributionTest extends 
DiscreteDistributionAbstractTest {
      * P(9900 &le; X &le; 10200) for X  = Po(10000)
      */
     @Test
-    public void testNormalApproximateProbability() {
+    void testNormalApproximateProbability() {
         PoissonDistribution dist = new PoissonDistribution(100);
         double result = dist.normalApproximateProbability(110) -
             dist.normalApproximateProbability(89);
@@ -143,25 +143,25 @@ public class PoissonDistributionTest extends 
DiscreteDistributionAbstractTest {
      * Test the degenerate cases of a 0.0 and 1.0 inverse cumulative 
probability.
      */
     @Test
-    public void testDegenerateInverseCumulativeProbability() {
+    void testDegenerateInverseCumulativeProbability() {
         final PoissonDistribution dist = new 
PoissonDistribution(DEFAULT_TEST_POISSON_PARAMETER);
         Assertions.assertEquals(Integer.MAX_VALUE, 
dist.inverseCumulativeProbability(1.0d));
         Assertions.assertEquals(0, dist.inverseCumulativeProbability(0d));
     }
 
     @Test
-    public void testParameterAccessors() {
+    void testParameterAccessors() {
         final PoissonDistribution dist = new PoissonDistribution(10.0);
         Assertions.assertEquals(10.0, dist.getMean());
     }
 
     @Test
-    public void testConstructorPrecondition1() {
+    void testConstructorPrecondition1() {
         Assertions.assertThrows(DistributionException.class, () -> new 
PoissonDistribution(-1));
     }
 
     @Test
-    public void testMoments() {
+    void testMoments() {
         final double tol = 1e-9;
         PoissonDistribution dist;
 
@@ -175,7 +175,7 @@ public class PoissonDistributionTest extends 
DiscreteDistributionAbstractTest {
     }
 
     @Test
-    public void testLargeMeanCumulativeProbability() {
+    void testLargeMeanCumulativeProbability() {
         double mean = 1.0;
         while (mean <= 10000000.0) {
             final PoissonDistribution dist = new PoissonDistribution(mean);
@@ -205,7 +205,7 @@ public class PoissonDistributionTest extends 
DiscreteDistributionAbstractTest {
      * JIRA: MATH-282
      */
     @Test
-    public void testCumulativeProbabilitySpecial() {
+    void testCumulativeProbabilitySpecial() {
         PoissonDistribution dist;
         dist = new PoissonDistribution(9120);
         checkProbability(dist, 9075);
@@ -225,7 +225,7 @@ public class PoissonDistributionTest extends 
DiscreteDistributionAbstractTest {
     }
 
     @Test
-    public void testLargeMeanInverseCumulativeProbability() {
+    void testLargeMeanInverseCumulativeProbability() {
         double mean = 1.0;
         while (mean <= 100000.0) { // Extended test value: 1E7.  Reduced to 
limit run time.
             final PoissonDistribution dist = new PoissonDistribution(mean);
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 5000450..6953672 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
@@ -70,14 +70,14 @@ public class TDistributionTest extends 
ContinuousDistributionAbstractTest {
      *      Bug report that prompted this unit test.</a>
      */
     @Test
-    public void testCumulativeProbabilityAgainstStackOverflow() {
+    void testCumulativeProbabilityAgainstStackOverflow() {
         final TDistribution td = new TDistribution(5.);
         td.cumulativeProbability(.1);
         td.cumulativeProbability(.01);
     }
 
     @Test
-    public void testSmallDf() {
+    void testSmallDf() {
         setDistribution(new TDistribution(1d));
         // quantiles computed using R version 2.9.2
         setCumulativeTestPoints(new double[] {-318.308838986, -31.8205159538, 
-12.7062047362,
@@ -95,14 +95,14 @@ public class TDistributionTest extends 
ContinuousDistributionAbstractTest {
     }
 
     @Test
-    public void testInverseCumulativeProbabilityExtremes() {
+    void testInverseCumulativeProbabilityExtremes() {
         setInverseCumulativeTestPoints(new double[] {0, 1});
         setInverseCumulativeTestValues(new double[] {Double.NEGATIVE_INFINITY, 
Double.POSITIVE_INFINITY});
         verifyInverseCumulativeProbabilities();
     }
 
     @Test
-    public void testCumulativeProbablilityExtremes() {
+    void testCumulativeProbablilityExtremes() {
         TDistribution dist;
         for (int i = 1; i < 11; i++) {
             dist = new TDistribution(i * 5);
@@ -114,18 +114,18 @@ public class TDistributionTest extends 
ContinuousDistributionAbstractTest {
     }
 
     @Test
-    public void testParameterAccessors() {
+    void testParameterAccessors() {
         final TDistribution dist = makeDistribution();
         Assertions.assertEquals(5d, dist.getDegreesOfFreedom());
     }
 
     @Test
-    public void testConstructorPrecondition1() {
+    void testConstructorPrecondition1() {
         Assertions.assertThrows(DistributionException.class, () -> new 
TDistribution(0));
     }
 
     @Test
-    public void testMoments() {
+    void testMoments() {
         final double tol = 1e-9;
         TDistribution dist;
 
@@ -149,7 +149,7 @@ public class TDistributionTest extends 
ContinuousDistributionAbstractTest {
      * Have chosen problevels from 0.10 to 0.001
      */
     @Test
-    public void nistData() {
+    void nistData() {
         final double[] prob = new double[]{0.10, 0.05, 0.025, 0.01, 0.005, 
0.001};
         final double[] args2 = new double[]{1.886, 2.920, 4.303, 6.965, 9.925, 
22.327};
         final double[] args10 = new double[]{1.372, 1.812, 2.228, 2.764, 
3.169, 4.143};
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 aef0d60..c1daab8 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
@@ -134,20 +134,20 @@ public class TriangularDistributionTest extends 
ContinuousDistributionAbstractTe
 
     /** Test lower bound getter. */
     @Test
-    public void testGetLowerBound() {
+    void testGetLowerBound() {
         final TriangularDistribution distribution = makeDistribution();
         Assertions.assertEquals(-3.0, distribution.getSupportLowerBound());
     }
 
     /** Test upper bound getter. */
     @Test
-    public void testGetUpperBound() {
+    void testGetUpperBound() {
         final TriangularDistribution distribution = makeDistribution();
         Assertions.assertEquals(12.0, distribution.getSupportUpperBound());
     }
 
     @Test
-    public void testParameterAccessors() {
+    void testParameterAccessors() {
         for (final double x : new double[] {0.1, 0.2, 0.45}) {
             final TriangularDistribution dist = new TriangularDistribution(0, 
x, 1.0);
             Assertions.assertEquals(x, dist.getMode());
@@ -156,30 +156,30 @@ public class TriangularDistributionTest extends 
ContinuousDistributionAbstractTe
 
     /** Test pre-condition for equal lower/upper limit. */
     @Test
-    public void testConstructorPreconditions1() {
+    void testConstructorPreconditions1() {
         Assertions.assertThrows(DistributionException.class, () -> new 
TriangularDistribution(0, 0, 0));
     }
 
     /** Test pre-condition for lower limit larger than upper limit. */
     @Test
-    public void testConstructorPreconditions2() {
+    void testConstructorPreconditions2() {
         Assertions.assertThrows(DistributionException.class, () -> new 
TriangularDistribution(1, 1, 0));
     }
 
     /** Test pre-condition for mode larger than upper limit. */
     @Test
-    public void testConstructorPreconditions3() {
+    void testConstructorPreconditions3() {
         Assertions.assertThrows(DistributionException.class, () -> new 
TriangularDistribution(0, 2, 1));
     }
 
     /** Test pre-condition for mode smaller than lower limit. */
     @Test
-    public void testConstructorPreconditions4() {
+    void testConstructorPreconditions4() {
         Assertions.assertThrows(DistributionException.class, () -> new 
TriangularDistribution(2, 1, 3));
     }
 
     @Test
-    public void testMoments() {
+    void testMoments() {
         TriangularDistribution dist;
 
         dist = new TriangularDistribution(0, 0.5, 1.0);
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 7f9dd39..5864513 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
@@ -68,32 +68,32 @@ public class UniformContinuousDistributionTest extends 
ContinuousDistributionAbs
 
     /** Test lower bound getter. */
     @Test
-    public void testGetLowerBound() {
+    void testGetLowerBound() {
         final UniformContinuousDistribution distribution = makeDistribution();
         Assertions.assertEquals(-0.5, distribution.getSupportLowerBound());
     }
 
     /** Test upper bound getter. */
     @Test
-    public void testGetUpperBound() {
+    void testGetUpperBound() {
         final UniformContinuousDistribution distribution = makeDistribution();
         Assertions.assertEquals(1.25, distribution.getSupportUpperBound());
     }
 
     /** Test pre-condition for equal lower/upper bound. */
     @Test
-    public void testConstructorPreconditions1() {
+    void testConstructorPreconditions1() {
         Assertions.assertThrows(DistributionException.class, () -> new 
UniformContinuousDistribution(0, 0));
     }
 
     /** Test pre-condition for lower bound larger than upper bound. */
     @Test
-    public void testConstructorPreconditions2() {
+    void testConstructorPreconditions2() {
         Assertions.assertThrows(DistributionException.class, () -> new 
UniformContinuousDistribution(1, 0));
     }
 
     @Test
-    public void testMoments() {
+    void testMoments() {
         UniformContinuousDistribution dist;
 
         dist = new UniformContinuousDistribution(0, 1);
@@ -114,7 +114,7 @@ public class UniformContinuousDistributionTest extends 
ContinuousDistributionAbs
      * with the default accuracy.
      */
     @Test
-    public void testInverseCumulativeDistribution() {
+    void testInverseCumulativeDistribution() {
         final UniformContinuousDistribution dist = new 
UniformContinuousDistribution(0, 1e-9);
 
         Assertions.assertEquals(2.5e-10, 
dist.inverseCumulativeProbability(0.25));
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 7a23480..242a7d5 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
@@ -86,7 +86,7 @@ public class UniformDiscreteDistributionTest extends 
DiscreteDistributionAbstrac
 
     /** Test mean/variance. */
     @Test
-    public void testMoments() {
+    void testMoments() {
         UniformDiscreteDistribution dist;
 
         dist = new UniformDiscreteDistribution(0, 5);
@@ -100,20 +100,20 @@ public class UniformDiscreteDistributionTest extends 
DiscreteDistributionAbstrac
 
     // MATH-1141
     @Test
-    public void testPreconditionUpperBoundInclusive1() {
+    void testPreconditionUpperBoundInclusive1() {
         Assertions.assertThrows(DistributionException.class, () -> new 
UniformDiscreteDistribution(1, 0));
     }
 
     // MATH-1141
     @Test
-    public void testPreconditionUpperBoundInclusive2() {
+    void testPreconditionUpperBoundInclusive2() {
         // Degenerate case is allowed.
         new UniformDiscreteDistribution(0, 0);
     }
 
     // MATH-1396
     @Test
-    public void testLargeRangeSubtractionOverflow() {
+    void testLargeRangeSubtractionOverflow() {
         final int hi = Integer.MAX_VALUE / 2 + 10;
         final UniformDiscreteDistribution dist = new 
UniformDiscreteDistribution(-hi, hi - 1);
 
@@ -126,7 +126,7 @@ public class UniformDiscreteDistributionTest extends 
DiscreteDistributionAbstrac
 
     // MATH-1396
     @Test
-    public void testLargeRangeAdditionOverflow() {
+    void testLargeRangeAdditionOverflow() {
         final int hi = Integer.MAX_VALUE / 2 + 10;
         final UniformDiscreteDistribution dist = new 
UniformDiscreteDistribution(hi - 1, hi + 1);
 
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 b31eabf..0f20e12 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
@@ -60,7 +60,7 @@ public class WeibullDistributionTest extends 
ContinuousDistributionAbstractTest
     //-------------------- Additional test cases 
-------------------------------
 
     @Test
-    public void testInverseCumulativeProbabilitySmallPAccuracy() {
+    void testInverseCumulativeProbabilitySmallPAccuracy() {
         final WeibullDistribution dist = new WeibullDistribution(2, 3);
         final double t = dist.inverseCumulativeProbability(1e-17);
         // Analytically, answer is solution to 1e-17 = 1-exp(-(x/3)^2)
@@ -70,31 +70,31 @@ public class WeibullDistributionTest extends 
ContinuousDistributionAbstractTest
     }
 
     @Test
-    public void testInverseCumulativeProbabilityExtremes() {
+    void testInverseCumulativeProbabilityExtremes() {
         setInverseCumulativeTestPoints(new double[] {0.0, 1.0});
         setInverseCumulativeTestValues(new double[] {0.0, 
Double.POSITIVE_INFINITY});
         verifyInverseCumulativeProbabilities();
     }
 
     @Test
-    public void testParameterAccessors() {
+    void testParameterAccessors() {
         final WeibullDistribution dist = new WeibullDistribution(1, 2);
         Assertions.assertEquals(1, dist.getShape());
         Assertions.assertEquals(2, dist.getScale());
     }
 
     @Test
-    public void testConstructorPrecondition1() {
+    void testConstructorPrecondition1() {
         Assertions.assertThrows(DistributionException.class, () -> new 
WeibullDistribution(0, 2));
     }
 
     @Test
-    public void testConstructorPrecondition2() {
+    void testConstructorPrecondition2() {
         Assertions.assertThrows(DistributionException.class, () -> new 
WeibullDistribution(1, 0));
     }
 
     @Test
-    public void testMoments() {
+    void testMoments() {
         final double tol = 1e-9;
         WeibullDistribution dist;
 
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 8715f37..730d50e 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
@@ -101,24 +101,24 @@ public class ZipfDistributionTest extends 
DiscreteDistributionAbstractTest {
     //-------------------- Additional test cases 
-------------------------------
 
     @Test
-    public void testParameterAccessors() {
+    void testParameterAccessors() {
         final ZipfDistribution distribution = makeDistribution();
         Assertions.assertEquals(10, distribution.getNumberOfElements());
         Assertions.assertEquals(1.0, distribution.getExponent());
     }
 
     @Test
-    public void testConstructorPreconditions1() {
+    void testConstructorPreconditions1() {
         Assertions.assertThrows(DistributionException.class, () -> new 
ZipfDistribution(0, 1));
     }
 
     @Test
-    public void testConstructorPreconditions2() {
+    void testConstructorPreconditions2() {
         Assertions.assertThrows(DistributionException.class, () -> new 
ZipfDistribution(1, 0));
     }
 
     @Test
-    public void testMoments() {
+    void testMoments() {
         final double tol = 1e-9;
         ZipfDistribution dist;
 
@@ -131,7 +131,7 @@ public class ZipfDistributionTest extends 
DiscreteDistributionAbstractTest {
      * Test sampling for various number of points and exponents.
      */
     @Test
-    public void testSamplingExtended() {
+    void testSamplingExtended() {
         final int sampleSize = 1000;
 
         final int[] numPointsValues = {

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