[commons-numbers] 02/02: Unit test.

[erans]

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commit 19899e7124dcd182fb3ebe31f17405c15be6cd19
Author: Gilles Sadowski <gillese...@gmail.com>
AuthorDate: Sun Jun 13 00:20:37 2021 +0200

    Unit test.
---
 commons-numbers-arrays/pom.xml                     | 10 ++++++++++
 .../arrays/MultidimensionalCounterTest.java        | 22 ++++++++++++++++++++++
 2 files changed, 32 insertions(+)

diff --git a/commons-numbers-arrays/pom.xml b/commons-numbers-arrays/pom.xml
index 894b93c..756b76f 100644
--- a/commons-numbers-arrays/pom.xml
+++ b/commons-numbers-arrays/pom.xml
@@ -42,4 +42,14 @@
     <numbers.parent.dir>${basedir}/..</numbers.parent.dir>
   </properties>
 
+  <dependencies>
+
+    <dependency>
+      <groupId>org.apache.commons</groupId>
+      <artifactId>commons-math3</artifactId>
+      <scope>test</scope>
+    </dependency>
+
+  </dependencies>
+
 </project>
diff --git 
a/commons-numbers-arrays/src/test/java/org/apache/commons/numbers/arrays/MultidimensionalCounterTest.java
 
b/commons-numbers-arrays/src/test/java/org/apache/commons/numbers/arrays/MultidimensionalCounterTest.java
index 7307eb5..62afd23 100644
--- 
a/commons-numbers-arrays/src/test/java/org/apache/commons/numbers/arrays/MultidimensionalCounterTest.java
+++ 
b/commons-numbers-arrays/src/test/java/org/apache/commons/numbers/arrays/MultidimensionalCounterTest.java
@@ -117,4 +117,26 @@ class MultidimensionalCounterTest {
         final MultidimensionalCounter c = MultidimensionalCounter.of(sizes);
         Assertions.assertEquals(Arrays.toString(sizes), c.toString());
     }
+
+    // Illustrates how to recover the iterator functionality that existed
+    // in Commons Math (v3.6.1) but was not ported to "Commons Numbers".
+    @Test
+    void testCommonsMathIterator() {
+        final int[] sizes = new int[] {3, 2, 5};
+        final org.apache.commons.math3.util.MultidimensionalCounter.Iterator 
cmIter =
+            new 
org.apache.commons.math3.util.MultidimensionalCounter(sizes).iterator();
+
+        final MultidimensionalCounter counter = 
MultidimensionalCounter.of(sizes);
+
+        Assertions.assertTrue(cmIter.hasNext());
+        Assertions.assertTrue(counter.getSize() > 0);
+
+        for (int i = 0; i < counter.getSize(); i++) {
+            cmIter.next();
+            Assertions.assertTrue(Arrays.equals(cmIter.getCounts(),
+                                                counter.toMulti(i)));
+        }
+
+        Assertions.assertFalse(cmIter.hasNext());
+    }
 }