--- jsr166/src/test/tck/ConcurrentLinkedDequeTest.java	2010/11/05 00:17:22	1.5
+++ jsr166/src/test/tck/ConcurrentLinkedDequeTest.java	2015/01/17 22:55:06	1.17
@@ -1,15 +1,22 @@
 /*
  * Written by Doug Lea with assistance from members of JCP JSR-166
  * Expert Group and released to the public domain, as explained at
- * http://creativecommons.org/licenses/publicdomain
+ * http://creativecommons.org/publicdomain/zero/1.0/
  * Other contributors include Andrew Wright, Jeffrey Hayes,
  * Pat Fisher, Mike Judd.
  */
 
-import junit.framework.*;
-import java.util.*;
-import java.util.concurrent.*;
-import java.io.*;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.Deque;
+import java.util.Iterator;
+import java.util.NoSuchElementException;
+import java.util.Queue;
+import java.util.Random;
+import java.util.concurrent.ConcurrentLinkedDeque;
+
+import junit.framework.Test;
+import junit.framework.TestSuite;
 
 public class ConcurrentLinkedDequeTest extends JSR166TestCase {
 
@@ -22,7 +29,7 @@ public class ConcurrentLinkedDequeTest e
     }
 
     /**
-     * Create a deque of given size containing consecutive
+     * Returns a new deque of given size containing consecutive
      * Integers 0 ... n.
      */
     private ConcurrentLinkedDeque<Integer> populatedDeque(int n) {
@@ -430,12 +437,18 @@ public class ConcurrentLinkedDequeTest e
      */
     public void testRemoveElement() {
         ConcurrentLinkedDeque q = populatedDeque(SIZE);
-        for (int i = 1; i < SIZE; i+=2) {
-            assertTrue(q.remove(new Integer(i)));
-        }
-        for (int i = 0; i < SIZE; i+=2) {
-            assertTrue(q.remove(new Integer(i)));
-            assertFalse(q.remove(new Integer(i+1)));
+        for (int i = 1; i < SIZE; i += 2) {
+            assertTrue(q.contains(i));
+            assertTrue(q.remove(i));
+            assertFalse(q.contains(i));
+            assertTrue(q.contains(i-1));
+        }
+        for (int i = 0; i < SIZE; i += 2) {
+            assertTrue(q.contains(i));
+            assertTrue(q.remove(i));
+            assertFalse(q.contains(i));
+            assertFalse(q.remove(i+1));
+            assertFalse(q.contains(i+1));
         }
         assertTrue(q.isEmpty());
     }
@@ -534,10 +547,10 @@ public class ConcurrentLinkedDequeTest e
      */
     public void testRemoveFirstOccurrence() {
         ConcurrentLinkedDeque q = populatedDeque(SIZE);
-        for (int i = 1; i < SIZE; i+=2) {
+        for (int i = 1; i < SIZE; i += 2) {
             assertTrue(q.removeFirstOccurrence(new Integer(i)));
         }
-        for (int i = 0; i < SIZE; i+=2) {
+        for (int i = 0; i < SIZE; i += 2) {
             assertTrue(q.removeFirstOccurrence(new Integer(i)));
             assertFalse(q.removeFirstOccurrence(new Integer(i+1)));
         }
@@ -549,10 +562,10 @@ public class ConcurrentLinkedDequeTest e
      */
     public void testRemoveLastOccurrence() {
         ConcurrentLinkedDeque q = populatedDeque(SIZE);
-        for (int i = 1; i < SIZE; i+=2) {
+        for (int i = 1; i < SIZE; i += 2) {
             assertTrue(q.removeLastOccurrence(new Integer(i)));
         }
-        for (int i = 0; i < SIZE; i+=2) {
+        for (int i = 0; i < SIZE; i += 2) {
             assertTrue(q.removeLastOccurrence(new Integer(i)));
             assertFalse(q.removeLastOccurrence(new Integer(i+1)));
         }
@@ -628,8 +641,8 @@ public class ConcurrentLinkedDequeTest e
             assertTrue(q.removeAll(p));
             assertEquals(SIZE-i, q.size());
             for (int j = 0; j < i; ++j) {
-                Integer I = (Integer)(p.remove());
-                assertFalse(q.contains(I));
+                Integer x = (Integer)(p.remove());
+                assertFalse(q.contains(x));
             }
         }
     }
@@ -683,13 +696,21 @@ public class ConcurrentLinkedDequeTest e
      */
     public void testIterator() {
         ConcurrentLinkedDeque q = populatedDeque(SIZE);
-        int i = 0;
         Iterator it = q.iterator();
-        while (it.hasNext()) {
+        int i;
+        for (i = 0; it.hasNext(); i++)
             assertTrue(q.contains(it.next()));
-            ++i;
-        }
         assertEquals(i, SIZE);
+        assertIteratorExhausted(it);
+    }
+
+    /**
+     * iterator of empty collection has no elements
+     */
+    public void testEmptyIterator() {
+        Deque c = new ConcurrentLinkedDeque();
+        assertIteratorExhausted(c.iterator());
+        assertIteratorExhausted(c.descendingIterator());
     }
 
     /**
@@ -829,7 +850,7 @@ public class ConcurrentLinkedDequeTest e
         ConcurrentLinkedDeque q = populatedDeque(SIZE);
         String s = q.toString();
         for (int i = 0; i < SIZE; ++i) {
-            assertTrue(s.indexOf(String.valueOf(i)) >= 0);
+            assertTrue(s.contains(String.valueOf(i)));
         }
     }
 
@@ -837,18 +858,44 @@ public class ConcurrentLinkedDequeTest e
      * A deserialized serialized deque has same elements in same order
      */
     public void testSerialization() throws Exception {
-        ConcurrentLinkedDeque q = populatedDeque(SIZE);
-        ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
-        ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
-        out.writeObject(q);
-        out.close();
-
-        ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
-        ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
-        ConcurrentLinkedDeque r = (ConcurrentLinkedDeque)in.readObject();
-        assertEquals(q.size(), r.size());
-        while (!q.isEmpty())
-            assertEquals(q.remove(), r.remove());
+        Queue x = populatedDeque(SIZE);
+        Queue y = serialClone(x);
+
+        assertNotSame(x, y);
+        assertEquals(x.size(), y.size());
+        assertEquals(x.toString(), y.toString());
+        assertTrue(Arrays.equals(x.toArray(), y.toArray()));
+        while (!x.isEmpty()) {
+            assertFalse(y.isEmpty());
+            assertEquals(x.remove(), y.remove());
+        }
+        assertTrue(y.isEmpty());
     }
 
+    /**
+     * contains(null) always return false.
+     * remove(null) always throws NullPointerException.
+     */
+    public void testNeverContainsNull() {
+        Deque<?>[] qs = {
+            new ConcurrentLinkedDeque<Object>(),
+            populatedDeque(2),
+        };
+
+        for (Deque<?> q : qs) {
+            assertFalse(q.contains(null));
+            try {
+                assertFalse(q.remove(null));
+                shouldThrow();
+            } catch (NullPointerException success) {}
+            try {
+                assertFalse(q.removeFirstOccurrence(null));
+                shouldThrow();
+            } catch (NullPointerException success) {}
+            try {
+                assertFalse(q.removeLastOccurrence(null));
+                shouldThrow();
+            } catch (NullPointerException success) {}
+        }
+    }
 }