--- jsr166/src/test/tck/LinkedBlockingDequeTest.java	2013/05/30 03:28:55	1.49
+++ jsr166/src/test/tck/LinkedBlockingDequeTest.java	2014/12/31 19:05:42	1.51
@@ -4,10 +4,12 @@
  * http://creativecommons.org/publicdomain/zero/1.0/
  */
 
-import junit.framework.*;
-import java.util.Arrays;
+import static java.util.concurrent.TimeUnit.MILLISECONDS;
+
 import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.Collection;
+import java.util.Deque;
 import java.util.Iterator;
 import java.util.NoSuchElementException;
 import java.util.Queue;
@@ -17,7 +19,8 @@ import java.util.concurrent.CountDownLat
 import java.util.concurrent.Executors;
 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.LinkedBlockingDeque;
-import static java.util.concurrent.TimeUnit.MILLISECONDS;
+
+import junit.framework.Test;
 
 public class LinkedBlockingDequeTest extends JSR166TestCase {
 
@@ -1774,4 +1777,21 @@ public class LinkedBlockingDequeTest ext
         }
     }
 
+    /**
+     * remove(null), contains(null) always return false
+     */
+    public void testNeverContainsNull() {
+        Deque<?>[] qs = {
+            new LinkedBlockingDeque<Object>(),
+            populatedDeque(2),
+        };
+
+        for (Deque<?> q : qs) {
+            assertFalse(q.contains(null));
+            assertFalse(q.remove(null));
+            assertFalse(q.removeFirstOccurrence(null));
+            assertFalse(q.removeLastOccurrence(null));
+        }
+    }
+
 }