Add missing test case ConstantContinuousDistribution.isSupportConnected
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 e9858f2..ae7a493 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
@@ -89,4 +89,10 @@
             Assertions.assertEquals(value, sampler.sample(), 0);
         }
     }
+
+    @Test
+    public void testIsSupportConnected() {
+        final ConstantContinuousDistribution dist = new ConstantContinuousDistribution(-1);
+        Assertions.assertTrue(dist.isSupportConnected());
+    }
 }