--- jsr166/src/test/tck/ArrayDequeTest.java	2013/05/30 03:28:55	1.28
+++ jsr166/src/test/tck/ArrayDequeTest.java	2014/12/31 19:05:42	1.30
@@ -4,9 +4,8 @@
  * http://creativecommons.org/publicdomain/zero/1.0/
  */
 
-import junit.framework.*;
-import java.util.Arrays;
 import java.util.ArrayDeque;
+import java.util.Arrays;
 import java.util.Collection;
 import java.util.Deque;
 import java.util.Iterator;
@@ -14,6 +13,9 @@ import java.util.NoSuchElementException;
 import java.util.Queue;
 import java.util.Random;
 
+import junit.framework.Test;
+import junit.framework.TestSuite;
+
 public class ArrayDequeTest extends JSR166TestCase {
     public static void main(String[] args) {
         junit.textui.TestRunner.run(suite());
@@ -890,4 +892,21 @@ public class ArrayDequeTest extends JSR1
         assertTrue(y.isEmpty());
     }
 
+    /**
+     * remove(null), contains(null) always return false
+     */
+    public void testNeverContainsNull() {
+        Deque<?>[] qs = {
+            new ArrayDeque<Object>(),
+            populatedDeque(2),
+        };
+
+        for (Deque<?> q : qs) {
+            assertFalse(q.contains(null));
+            assertFalse(q.remove(null));
+            assertFalse(q.removeFirstOccurrence(null));
+            assertFalse(q.removeLastOccurrence(null));
+        }
+    }
+
 }