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From er...@apache.org
Subject [39/53] [abbrv] [math] Added unit test.
Date Thu, 21 Apr 2016 23:15:25 GMT
Added unit test.


Project: http://git-wip-us.apache.org/repos/asf/commons-math/repo
Commit: http://git-wip-us.apache.org/repos/asf/commons-math/commit/80814930
Tree: http://git-wip-us.apache.org/repos/asf/commons-math/tree/80814930
Diff: http://git-wip-us.apache.org/repos/asf/commons-math/diff/80814930

Branch: refs/heads/develop
Commit: 808149305ba26224917e29aa0c0089701bd91936
Parents: 7a8dc00
Author: Gilles <erans@apache.org>
Authored: Sun Mar 13 03:05:54 2016 +0100
Committer: Gilles <erans@apache.org>
Committed: Mon Mar 21 00:36:55 2016 +0100

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 .../apache/commons/math4/util/MathArraysTest.java  | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)
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http://git-wip-us.apache.org/repos/asf/commons-math/blob/80814930/src/test/java/org/apache/commons/math4/util/MathArraysTest.java
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diff --git a/src/test/java/org/apache/commons/math4/util/MathArraysTest.java b/src/test/java/org/apache/commons/math4/util/MathArraysTest.java
index a6cc764..e71a824 100644
--- a/src/test/java/org/apache/commons/math4/util/MathArraysTest.java
+++ b/src/test/java/org/apache/commons/math4/util/MathArraysTest.java
@@ -1107,6 +1107,23 @@ public class MathArraysTest {
     }
 
     @Test
+    public void testShuffleNoDuplicates() {
+        final int n = 100;
+        final int[] orig = MathArrays.natural(n);
+        MathArrays.shuffle(orig);
+
+        // Test that all (unique) entries exist in the shuffled array.
+        final int[] count = new int[n];
+        for (int i = 0; i < n; i++) {
+            count[orig[i]] += 1;
+        }
+
+        for (int i = 0; i < n; i++) {
+            Assert.assertEquals(1, count[i]);
+        }
+    }
+
+    @Test
     public void testShuffleTail() {
         final int[] orig = new int[] { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 };
         final int[] list = orig.clone();


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