[commons-statistics] 10/12: Use parameterized test

[aherbert]

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

commit fe8b1bdd79de6c67f8a630310b48c796fd26ef33
Author: Alex Herbert <aherb...@apache.org>
AuthorDate: Mon Nov 21 19:03:07 2022 +0000

    Use parameterized test
---
 .../distribution/PoissonDistributionTest.java      | 24 ++++++++++------------
 1 file changed, 11 insertions(+), 13 deletions(-)

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 37a539b..7e39964 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
@@ -21,6 +21,8 @@ import org.apache.commons.rng.simple.RandomSource;
 import org.junit.jupiter.api.Assertions;
 import org.junit.jupiter.api.Disabled;
 import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.CsvSource;
 
 /**
  * Test cases for {@link PoissonDistribution}.
@@ -84,19 +86,15 @@ class PoissonDistributionTest extends 
BaseDiscreteDistributionTest {
     /**
      * JIRA: MATH-282
      */
-    @Test
-    void testCumulativeProbabilitySpecial() {
-        PoissonDistribution dist;
-        dist = PoissonDistribution.of(9120);
-        checkProbability(dist, 9075);
-        checkProbability(dist, 9102);
-        dist = PoissonDistribution.of(5058);
-        checkProbability(dist, 5044);
-        dist = PoissonDistribution.of(6986);
-        checkProbability(dist, 6950);
-    }
-
-    private void checkProbability(PoissonDistribution dist, int x) {
+    @ParameterizedTest
+    @CsvSource({
+        "9120, 9075",
+        "9120, 9102",
+        "5058, 5044",
+        "6986, 6950",
+    })
+    void testCumulativeProbabilitySpecial(double mean, int x) {
+        final PoissonDistribution dist = PoissonDistribution.of(mean);
         final double p = dist.cumulativeProbability(x);
         Assertions.assertFalse(Double.isNaN(p), () -> "NaN cumulative 
probability returned for mean = " +
                 dist.getMean() + " x = " + x);