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diff --git a/vespajlib/src/test/java/com/yahoo/collections/CollectionUtilTest.java b/vespajlib/src/test/java/com/yahoo/collections/CollectionUtilTest.java
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+++ b/vespajlib/src/test/java/com/yahoo/collections/CollectionUtilTest.java
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+// Copyright 2016 Yahoo Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+package com.yahoo.collections;
+
+import org.junit.Before;
+import org.junit.Test;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.List;
+
+import static org.junit.Assert.*;
+
+/**
+ * @author tonytv
+ */
+public class CollectionUtilTest {
+    List<Integer> l1 = Arrays.asList(1, 2, 4, 5, 6, 7);
+    List<Integer> l2 = Arrays.asList(3, 4, 5, 6, 7);
+
+    @Before
+    public void shuffle() {
+        Collections.shuffle(l1);
+        Collections.shuffle(l2);
+    }
+
+    @Test
+    public void testMkString() {
+        assertEquals("1, 2, 3, 4",
+                CollectionUtil.mkString(Arrays.asList(1, 2, 3, 4), ", "));
+    }
+
+    @Test
+    public void testEqualContentsIgnoreOrder() {
+        List<Integer> l2Copy = new ArrayList<>();
+        l2Copy.addAll(l2);
+        shuffle();
+        assertTrue(CollectionUtil.equalContentsIgnoreOrder(
+                l2, l2Copy));
+        assertFalse(CollectionUtil.equalContentsIgnoreOrder(
+                l1, l2));
+    }
+
+    @Test
+    public void testSymmetricDifference() {
+        assertTrue(CollectionUtil.equalContentsIgnoreOrder(
+                Arrays.asList(1, 2, 3),
+                CollectionUtil.symmetricDifference(l1, l2)));
+    }
+}