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root/jsr166/jsr166/src/test/tck/ConcurrentLinkedQueueTest.java

Comparing jsr166/src/test/tck/ConcurrentLinkedQueueTest.java (file contents):
Revision 1.3 by dl, Sun Sep 14 20:42:40 2003 UTC vs.
Revision 1.51 by jsr166, Wed Jan 27 01:57:24 2021 UTC

#	Line 1 | Line 1
1		/*
2	<	* Written by members of JCP JSR-166 Expert Group and released to the
3	<	* public domain. Use, modify, and redistribute this code in any way
4	<	* without acknowledgement. Other contributors include Andrew Wright,
5	<	* Jeffrey Hayes, Pat Fischer, Mike Judd.
2	>	* Written by Doug Lea with assistance from members of JCP JSR-166
3	>	* Expert Group and released to the public domain, as explained at
4	>	* http://creativecommons.org/publicdomain/zero/1.0/
5	>	* Other contributors include Andrew Wright, Jeffrey Hayes,
6	>	* Pat Fisher, Mike Judd.
7		*/
8
9	<	import junit.framework.*;
10	<	import java.util.*;
11	<	import java.util.concurrent.*;
12	<	import java.io.*;
9	>	import java.util.Arrays;
10	>	import java.util.Collection;
11	>	import java.util.Iterator;
12	>	import java.util.NoSuchElementException;
13	>	import java.util.Queue;
14	>	import java.util.concurrent.ConcurrentLinkedQueue;
15	>
16	>	import junit.framework.Test;
17
18		public class ConcurrentLinkedQueueTest extends JSR166TestCase {
19
20		public static void main(String[] args) {
21	<	junit.textui.TestRunner.run (suite());
21	>	main(suite(), args);
22		}
23
24		public static Test suite() {
25	<	return new TestSuite(ConcurrentLinkedQueueTest.class);
25	>	class Implementation implements CollectionImplementation {
26	>	public Class<?> klazz() { return ConcurrentLinkedQueue.class; }
27	>	public Collection emptyCollection() { return new ConcurrentLinkedQueue(); }
28	>	public Object makeElement(int i) { return JSR166TestCase.itemFor(i); }
29	>	public boolean isConcurrent() { return true; }
30	>	public boolean permitsNulls() { return false; }
31	>	}
32	>	return newTestSuite(ConcurrentLinkedQueueTest.class,
33	>	CollectionTest.testSuite(new Implementation()));
34		}
35
36		/**
37	<	* Create a queue of given size containing consecutive
38	<	* Integers 0 ... n.
37	>	* Returns a new queue of given size containing consecutive
38	>	* Items 0 ... n - 1.
39		*/
40	<	private ConcurrentLinkedQueue populatedQueue(int n) {
41	<	ConcurrentLinkedQueue q = new ConcurrentLinkedQueue();
40	>	private static ConcurrentLinkedQueue<Item> populatedQueue(int n) {
41	>	ConcurrentLinkedQueue<Item> q = new ConcurrentLinkedQueue<>();
42		assertTrue(q.isEmpty());
43	<	for(int i = 0; i < n; ++i)
44	<	assertTrue(q.offer(new Integer(i)));
43	>	for (int i = 0; i < n; ++i)
44	>	mustOffer(q, i);
45		assertFalse(q.isEmpty());
46	<	assertEquals(n, q.size());
46	>	mustEqual(n, q.size());
47	>	mustEqual(0, q.peek());
48		return q;
49		}
50	<
51	<	public void testConstructor1(){
52	<	assertEquals(0, new ConcurrentLinkedQueue().size());
50	>
51	>	/**
52	>	* new queue is empty
53	>	*/
54	>	public void testConstructor1() {
55	>	mustEqual(0, new ConcurrentLinkedQueue<Item>().size());
56		}
57
58	+	/**
59	+	* Initializing from null Collection throws NPE
60	+	*/
61		public void testConstructor3() {
62		try {
63	<	ConcurrentLinkedQueue q = new ConcurrentLinkedQueue((Collection)null);
64	<	fail("Cannot make from null collection");
65	<	}
46	<	catch (NullPointerException success) {}
63	>	new ConcurrentLinkedQueue<Item>((Collection<Item>)null);
64	>	shouldThrow();
65	>	} catch (NullPointerException success) {}
66		}
67
68	<	public void testConstructor4(){
68	>	/**
69	>	* Initializing from Collection of null elements throws NPE
70	>	*/
71	>	public void testConstructor4() {
72		try {
73	<	Integer[] ints = new Integer[SIZE];
74	<	ConcurrentLinkedQueue q = new ConcurrentLinkedQueue(Arrays.asList(ints));
75	<	fail("Cannot make with null elements");
54	<	}
55	<	catch (NullPointerException success) {}
73	>	new ConcurrentLinkedQueue<Item>(Arrays.asList(new Item[SIZE]));
74	>	shouldThrow();
75	>	} catch (NullPointerException success) {}
76		}
77
78	<	public void testConstructor5(){
79	<	try {
80	<	Integer[] ints = new Integer[SIZE];
81	<	for (int i = 0; i < SIZE-1; ++i)
82	<	ints[i] = new Integer(i);
83	<	ConcurrentLinkedQueue q = new ConcurrentLinkedQueue(Arrays.asList(ints));
84	<	fail("Cannot make with null elements");
85	<	}
86	<	catch (NullPointerException success) {}
78	>	/**
79	>	* Initializing from Collection with some null elements throws NPE
80	>	*/
81	>	public void testConstructor5() {
82	>	Item[] items = new Item[2];
83	>	items[0] = zero;
84	>	try {
85	>	new ConcurrentLinkedQueue<Item>(Arrays.asList(items));
86	>	shouldThrow();
87	>	} catch (NullPointerException success) {}
88		}
89
90	<	public void testConstructor6(){
91	<	try {
92	<	Integer[] ints = new Integer[SIZE];
93	<	for (int i = 0; i < SIZE; ++i)
94	<	ints[i] = new Integer(i);
95	<	ConcurrentLinkedQueue q = new ConcurrentLinkedQueue(Arrays.asList(ints));
96	<	for (int i = 0; i < SIZE; ++i)
97	<	assertEquals(ints[i], q.poll());
77	<	}
78	<	finally {}
90	>	/**
91	>	* Queue contains all elements of collection used to initialize
92	>	*/
93	>	public void testConstructor6() {
94	>	Item[] items = defaultItems;
95	>	ConcurrentLinkedQueue<Item> q = new ConcurrentLinkedQueue<>(Arrays.asList(items));
96	>	for (int i = 0; i < SIZE; ++i)
97	>	mustEqual(items[i], q.poll());
98		}
99
100	+	/**
101	+	* isEmpty is true before add, false after
102	+	*/
103		public void testEmpty() {
104	<	ConcurrentLinkedQueue q = new ConcurrentLinkedQueue();
104	>	ConcurrentLinkedQueue<Item> q = new ConcurrentLinkedQueue<>();
105		assertTrue(q.isEmpty());
106		q.add(one);
107		assertFalse(q.isEmpty());
#	Line 89 | Line 111 | public class ConcurrentLinkedQueueTest e
111		assertTrue(q.isEmpty());
112		}
113
114	+	/**
115	+	* size changes when elements added and removed
116	+	*/
117		public void testSize() {
118	<	ConcurrentLinkedQueue q = populatedQueue(SIZE);
118	>	ConcurrentLinkedQueue<Item> q = populatedQueue(SIZE);
119		for (int i = 0; i < SIZE; ++i) {
120	<	assertEquals(SIZE-i, q.size());
120	>	mustEqual(SIZE - i, q.size());
121		q.remove();
122		}
123		for (int i = 0; i < SIZE; ++i) {
124	<	assertEquals(i, q.size());
125	<	q.add(new Integer(i));
124	>	mustEqual(i, q.size());
125	>	mustAdd(q, i);
126		}
127		}
128
129	<	public void testOfferNull(){
130	<	try {
131	<	ConcurrentLinkedQueue q = new ConcurrentLinkedQueue();
129	>	/**
130	>	* offer(null) throws NPE
131	>	*/
132	>	public void testOfferNull() {
133	>	ConcurrentLinkedQueue<Item> q = new ConcurrentLinkedQueue<>();
134	>	try {
135		q.offer(null);
136	<	fail("should throw NPE");
137	<	} catch (NullPointerException success) { }
136	>	shouldThrow();
137	>	} catch (NullPointerException success) {}
138	>	}
139	>
140	>	/**
141	>	* add(null) throws NPE
142	>	*/
143	>	public void testAddNull() {
144	>	ConcurrentLinkedQueue<Item> q = new ConcurrentLinkedQueue<>();
145	>	try {
146	>	q.add(null);
147	>	shouldThrow();
148	>	} catch (NullPointerException success) {}
149		}
150
151	+	/**
152	+	* Offer returns true
153	+	*/
154		public void testOffer() {
155	<	ConcurrentLinkedQueue q = new ConcurrentLinkedQueue();
155	>	ConcurrentLinkedQueue<Item> q = new ConcurrentLinkedQueue<>();
156		assertTrue(q.offer(zero));
157		assertTrue(q.offer(one));
158		}
159
160	<	public void testAdd(){
161	<	ConcurrentLinkedQueue q = new ConcurrentLinkedQueue();
160	>	/**
161	>	* add returns true
162	>	*/
163	>	public void testAdd() {
164	>	ConcurrentLinkedQueue<Item> q = new ConcurrentLinkedQueue<>();
165		for (int i = 0; i < SIZE; ++i) {
166	<	assertEquals(i, q.size());
167	<	assertTrue(q.add(new Integer(i)));
166	>	mustEqual(i, q.size());
167	>	mustAdd(q, i);
168		}
169		}
170
171	<	public void testAddAll1(){
171	>	/**
172	>	* addAll(null) throws NullPointerException
173	>	*/
174	>	public void testAddAll1() {
175	>	ConcurrentLinkedQueue<Item> q = new ConcurrentLinkedQueue<>();
176		try {
128	–	ConcurrentLinkedQueue q = new ConcurrentLinkedQueue();
177		q.addAll(null);
178	<	fail("Cannot add null collection");
179	<	}
132	<	catch (NullPointerException success) {}
178	>	shouldThrow();
179	>	} catch (NullPointerException success) {}
180		}
181	<	public void testAddAll2(){
181	>
182	>	/**
183	>	* addAll(this) throws IllegalArgumentException
184	>	*/
185	>	public void testAddAllSelf() {
186	>	ConcurrentLinkedQueue<Item> q = populatedQueue(SIZE);
187		try {
188	<	ConcurrentLinkedQueue q = new ConcurrentLinkedQueue();
189	<	Integer[] ints = new Integer[SIZE];
190	<	q.addAll(Arrays.asList(ints));
139	<	fail("Cannot add null elements");
140	<	}
141	<	catch (NullPointerException success) {}
188	>	q.addAll(q);
189	>	shouldThrow();
190	>	} catch (IllegalArgumentException success) {}
191		}
192	<	public void testAddAll3(){
192	>
193	>	/**
194	>	* addAll of a collection with null elements throws NullPointerException
195	>	*/
196	>	public void testAddAll2() {
197	>	ConcurrentLinkedQueue<Item> q = new ConcurrentLinkedQueue<>();
198		try {
199	<	ConcurrentLinkedQueue q = new ConcurrentLinkedQueue();
200	<	Integer[] ints = new Integer[SIZE];
201	<	for (int i = 0; i < SIZE-1; ++i)
148	<	ints[i] = new Integer(i);
149	<	q.addAll(Arrays.asList(ints));
150	<	fail("Cannot add null elements");
151	<	}
152	<	catch (NullPointerException success) {}
199	>	q.addAll(Arrays.asList(new Item[SIZE]));
200	>	shouldThrow();
201	>	} catch (NullPointerException success) {}
202		}
203
204	<	public void testAddAll5(){
205	<	try {
206	<	Integer[] empty = new Integer[0];
207	<	Integer[] ints = new Integer[SIZE];
208	<	for (int i = 0; i < SIZE; ++i)
209	<	ints[i] = new Integer(i);
210	<	ConcurrentLinkedQueue q = new ConcurrentLinkedQueue();
211	<	assertFalse(q.addAll(Arrays.asList(empty)));
212	<	assertTrue(q.addAll(Arrays.asList(ints)));
213	<	for (int i = 0; i < SIZE; ++i)
214	<	assertEquals(ints[i], q.poll());
215	<	}
216	<	finally {}
204	>	/**
205	>	* addAll of a collection with any null elements throws NPE after
206	>	* possibly adding some elements
207	>	*/
208	>	public void testAddAll3() {
209	>	ConcurrentLinkedQueue<Item> q = new ConcurrentLinkedQueue<>();
210	>	Item[] items = new Item[2];
211	>	items[0] = zero;
212	>	try {
213	>	q.addAll(Arrays.asList(items));
214	>	shouldThrow();
215	>	} catch (NullPointerException success) {}
216	>	}
217	>
218	>	/**
219	>	* Queue contains all elements, in traversal order, of successful addAll
220	>	*/
221	>	public void testAddAll5() {
222	>	Item[] empty = new Item[0];
223	>	Item[] items = defaultItems;
224	>	ConcurrentLinkedQueue<Item> q = new ConcurrentLinkedQueue<>();
225	>	assertFalse(q.addAll(Arrays.asList(empty)));
226	>	assertTrue(q.addAll(Arrays.asList(items)));
227	>	for (int i = 0; i < SIZE; ++i)
228	>	mustEqual(items[i], q.poll());
229		}
230
231	<	public void testPoll(){
232	<	ConcurrentLinkedQueue q = populatedQueue(SIZE);
231	>	/**
232	>	* poll succeeds unless empty
233	>	*/
234	>	public void testPoll() {
235	>	ConcurrentLinkedQueue<Item> q = populatedQueue(SIZE);
236		for (int i = 0; i < SIZE; ++i) {
237	<	assertEquals(i, ((Integer)q.poll()).intValue());
237	>	mustEqual(i, q.poll());
238		}
239	<	assertNull(q.poll());
239	>	assertNull(q.poll());
240		}
241
242	<	public void testPeek(){
243	<	ConcurrentLinkedQueue q = populatedQueue(SIZE);
242	>	/**
243	>	* peek returns next element, or null if empty
244	>	*/
245	>	public void testPeek() {
246	>	ConcurrentLinkedQueue<Item> q = populatedQueue(SIZE);
247		for (int i = 0; i < SIZE; ++i) {
248	<	assertEquals(i, ((Integer)q.peek()).intValue());
249	<	q.poll();
248	>	mustEqual(i, q.peek());
249	>	mustEqual(i, q.poll());
250		assertTrue(q.peek() == null ||
251	<	i != ((Integer)q.peek()).intValue());
251	>	!q.peek().equals(i));
252		}
253	<	assertNull(q.peek());
253	>	assertNull(q.peek());
254		}
255
256	<	public void testElement(){
257	<	ConcurrentLinkedQueue q = populatedQueue(SIZE);
256	>	/**
257	>	* element returns next element, or throws NSEE if empty
258	>	*/
259	>	public void testElement() {
260	>	ConcurrentLinkedQueue<Item> q = populatedQueue(SIZE);
261		for (int i = 0; i < SIZE; ++i) {
262	<	assertEquals(i, ((Integer)q.element()).intValue());
263	<	q.poll();
262	>	mustEqual(i, q.element());
263	>	mustEqual(i, q.poll());
264		}
265		try {
266		q.element();
267	<	fail("no such element");
268	<	}
199	<	catch (NoSuchElementException success) {}
267	>	shouldThrow();
268	>	} catch (NoSuchElementException success) {}
269		}
270
271	<	public void testRemove(){
272	<	ConcurrentLinkedQueue q = populatedQueue(SIZE);
271	>	/**
272	>	* remove removes next element, or throws NSEE if empty
273	>	*/
274	>	public void testRemove() {
275	>	ConcurrentLinkedQueue<Item> q = populatedQueue(SIZE);
276		for (int i = 0; i < SIZE; ++i) {
277	<	assertEquals(i, ((Integer)q.remove()).intValue());
277	>	mustEqual(i, q.remove());
278		}
279		try {
280		q.remove();
281	<	fail("remove should throw");
282	<	} catch (NoSuchElementException success){
211	<	}
281	>	shouldThrow();
282	>	} catch (NoSuchElementException success) {}
283		}
284
285	<	public void testRemoveElement(){
286	<	ConcurrentLinkedQueue q = populatedQueue(SIZE);
287	<	for (int i = 1; i < SIZE; i+=2) {
288	<	assertTrue(q.remove(new Integer(i)));
289	<	}
290	<	for (int i = 0; i < SIZE; i+=2) {
291	<	assertTrue(q.remove(new Integer(i)));
292	<	assertFalse(q.remove(new Integer(i+1)));
285	>	/**
286	>	* remove(x) removes x and returns true if present
287	>	*/
288	>	public void testRemoveElement() {
289	>	ConcurrentLinkedQueue<Item> q = populatedQueue(SIZE);
290	>	for (int i = 1; i < SIZE; i += 2) {
291	>	mustContain(q, i);
292	>	mustRemove(q, i);
293	>	mustNotContain(q, i);
294	>	mustContain(q, i - 1);
295	>	}
296	>	for (int i = 0; i < SIZE; i += 2) {
297	>	mustContain(q, i);
298	>	mustRemove(q, i);
299	>	mustNotContain(q, i);
300	>	mustNotRemove(q, i + 1);
301	>	mustNotContain(q, i + 1);
302		}
303		assertTrue(q.isEmpty());
304		}
305	<
306	<	public void testContains(){
307	<	ConcurrentLinkedQueue q = populatedQueue(SIZE);
305	>
306	>	/**
307	>	* contains(x) reports true when elements added but not yet removed
308	>	*/
309	>	public void testContains() {
310	>	ConcurrentLinkedQueue<Item> q = populatedQueue(SIZE);
311		for (int i = 0; i < SIZE; ++i) {
312	<	assertTrue(q.contains(new Integer(i)));
312	>	mustContain(q, i);
313		q.poll();
314	<	assertFalse(q.contains(new Integer(i)));
314	>	mustNotContain(q, i);
315		}
316		}
317
318	<	public void testClear(){
319	<	ConcurrentLinkedQueue q = populatedQueue(SIZE);
318	>	/**
319	>	* clear removes all elements
320	>	*/
321	>	public void testClear() {
322	>	ConcurrentLinkedQueue<Item> q = populatedQueue(SIZE);
323		q.clear();
324		assertTrue(q.isEmpty());
325	<	assertEquals(0, q.size());
325	>	mustEqual(0, q.size());
326		q.add(one);
327		assertFalse(q.isEmpty());
328		q.clear();
329		assertTrue(q.isEmpty());
330		}
331
332	<	public void testContainsAll(){
333	<	ConcurrentLinkedQueue q = populatedQueue(SIZE);
334	<	ConcurrentLinkedQueue p = new ConcurrentLinkedQueue();
332	>	/**
333	>	* containsAll(c) is true when c contains a subset of elements
334	>	*/
335	>	public void testContainsAll() {
336	>	ConcurrentLinkedQueue<Item> q = populatedQueue(SIZE);
337	>	ConcurrentLinkedQueue<Item> p = new ConcurrentLinkedQueue<>();
338		for (int i = 0; i < SIZE; ++i) {
339		assertTrue(q.containsAll(p));
340		assertFalse(p.containsAll(q));
341	<	p.add(new Integer(i));
341	>	mustAdd(p, i);
342		}
343		assertTrue(p.containsAll(q));
344		}
345
346	<	public void testRetainAll(){
347	<	ConcurrentLinkedQueue q = populatedQueue(SIZE);
348	<	ConcurrentLinkedQueue p = populatedQueue(SIZE);
346	>	/**
347	>	* retainAll(c) retains only those elements of c and reports true if change
348	>	*/
349	>	public void testRetainAll() {
350	>	ConcurrentLinkedQueue<Item> q = populatedQueue(SIZE);
351	>	ConcurrentLinkedQueue<Item> p = populatedQueue(SIZE);
352		for (int i = 0; i < SIZE; ++i) {
353		boolean changed = q.retainAll(p);
354		if (i == 0)
#	Line 265 | Line 357 | public class ConcurrentLinkedQueueTest e
357		assertTrue(changed);
358
359		assertTrue(q.containsAll(p));
360	<	assertEquals(SIZE-i, q.size());
360	>	mustEqual(SIZE - i, q.size());
361		p.remove();
362		}
363		}
364
365	<	public void testRemoveAll(){
365	>	/**
366	>	* removeAll(c) removes only those elements of c and reports true if changed
367	>	*/
368	>	public void testRemoveAll() {
369		for (int i = 1; i < SIZE; ++i) {
370	<	ConcurrentLinkedQueue q = populatedQueue(SIZE);
371	<	ConcurrentLinkedQueue p = populatedQueue(i);
370	>	ConcurrentLinkedQueue<Item> q = populatedQueue(SIZE);
371	>	ConcurrentLinkedQueue<Item> p = populatedQueue(i);
372		assertTrue(q.removeAll(p));
373	<	assertEquals(SIZE-i, q.size());
373	>	mustEqual(SIZE - i, q.size());
374		for (int j = 0; j < i; ++j) {
375	<	Integer I = (Integer)(p.remove());
376	<	assertFalse(q.contains(I));
375	>	Item x = p.remove();
376	>	assertFalse(q.contains(x));
377		}
378		}
379		}
380
381	<	public void testToArray(){
382	<	ConcurrentLinkedQueue q = populatedQueue(SIZE);
383	<	Object[] o = q.toArray();
384	<	Arrays.sort(o);
385	<	for(int i = 0; i < o.length; i++)
386	<	assertEquals(o[i], q.poll());
387	<	}
388	<
389	<	public void testToArray2(){
390	<	ConcurrentLinkedQueue q = populatedQueue(SIZE);
391	<	Integer[] ints = new Integer[SIZE];
392	<	ints = (Integer[])q.toArray(ints);
393	<	Arrays.sort(ints);
394	<	for(int i = 0; i < ints.length; i++)
395	<	assertEquals(ints[i], q.poll());
396	<	}
397	<
398	<	public void testIterator(){
399	<	ConcurrentLinkedQueue q = populatedQueue(SIZE);
400	<	int i = 0;
401	<	Iterator it = q.iterator();
402	<	while(it.hasNext()) {
403	<	assertTrue(q.contains(it.next()));
309	<	++i;
310	<	}
311	<	assertEquals(i, SIZE);
381	>	/**
382	>	* toArray contains all elements in FIFO order
383	>	*/
384	>	public void testToArray() {
385	>	ConcurrentLinkedQueue<Item> q = populatedQueue(SIZE);
386	>	Object[] a = q.toArray();
387	>	assertSame(Object[].class, a.getClass());
388	>	for (Object o : a)
389	>	assertSame(o, q.poll());
390	>	assertTrue(q.isEmpty());
391	>	}
392	>
393	>	/**
394	>	* toArray(a) contains all elements in FIFO order
395	>	*/
396	>	public void testToArray2() {
397	>	ConcurrentLinkedQueue<Item> q = populatedQueue(SIZE);
398	>	Item[] items = new Item[SIZE];
399	>	Item[] array = q.toArray(items);
400	>	assertSame(items, array);
401	>	for (Item o : items)
402	>	assertSame(o, q.poll());
403	>	assertTrue(q.isEmpty());
404		}
405
406	+	/**
407	+	* toArray(null) throws NullPointerException
408	+	*/
409	+	public void testToArray_NullArg() {
410	+	ConcurrentLinkedQueue<Item> q = populatedQueue(SIZE);
411	+	try {
412	+	q.toArray((Object[])null);
413	+	shouldThrow();
414	+	} catch (NullPointerException success) {}
415	+	}
416	+
417	+	/**
418	+	* toArray(incompatible array type) throws ArrayStoreException
419	+	*/
420	+	public void testToArray1_BadArg() {
421	+	ConcurrentLinkedQueue<Item> q = populatedQueue(SIZE);
422	+	try {
423	+	q.toArray(new String[10]);
424	+	shouldThrow();
425	+	} catch (ArrayStoreException success) {}
426	+	}
427	+
428	+	/**
429	+	* iterator iterates through all elements
430	+	*/
431	+	public void testIterator() {
432	+	ConcurrentLinkedQueue<Item> q = populatedQueue(SIZE);
433	+	Iterator<? extends Item> it = q.iterator();
434	+	int i;
435	+	for (i = 0; it.hasNext(); i++)
436	+	mustContain(q, it.next());
437	+	mustEqual(i, SIZE);
438	+	assertIteratorExhausted(it);
439	+	}
440	+
441	+	/**
442	+	* iterator of empty collection has no elements
443	+	*/
444	+	public void testEmptyIterator() {
445	+	assertIteratorExhausted(new ConcurrentLinkedQueue<>().iterator());
446	+	}
447	+
448	+	/**
449	+	* iterator ordering is FIFO
450	+	*/
451		public void testIteratorOrdering() {
452	<	final ConcurrentLinkedQueue q = new ConcurrentLinkedQueue();
452	>	final ConcurrentLinkedQueue<Item> q = new ConcurrentLinkedQueue<>();
453		q.add(one);
454		q.add(two);
455		q.add(three);
456
457		int k = 0;
458	<	for (Iterator it = q.iterator(); it.hasNext();) {
459	<	int i = ((Integer)(it.next())).intValue();
323	<	assertEquals("items should come out in order", ++k, i);
458	>	for (Iterator<? extends Item> it = q.iterator(); it.hasNext();) {
459	>	mustEqual(++k, it.next());
460		}
461
462	<	assertEquals("should go through 3 elements", 3, k);
462	>	mustEqual(3, k);
463		}
464
465	<	public void testWeaklyConsistentIteration () {
466	<	final ConcurrentLinkedQueue q = new ConcurrentLinkedQueue();
465	>	/**
466	>	* Modifications do not cause iterators to fail
467	>	*/
468	>	public void testWeaklyConsistentIteration() {
469	>	final ConcurrentLinkedQueue<Item> q = new ConcurrentLinkedQueue<>();
470		q.add(one);
471		q.add(two);
472		q.add(three);
473
474	<	try {
475	<	for (Iterator it = q.iterator(); it.hasNext();) {
476	<	q.remove();
338	<	it.next();
339	<	}
340	<	}
341	<	catch (ConcurrentModificationException e) {
342	<	fail("weakly consistent iterator; should not get CME");
474	>	for (Iterator<? extends Item> it = q.iterator(); it.hasNext();) {
475	>	q.remove();
476	>	it.next();
477		}
478
479	<	assertEquals("queue should be empty again", 0, q.size());
479	>	mustEqual(0, q.size());
480		}
481
482	<	public void testIteratorRemove () {
483	<	final ConcurrentLinkedQueue q = new ConcurrentLinkedQueue();
482	>	/**
483	>	* iterator.remove removes current element
484	>	*/
485	>	public void testIteratorRemove() {
486	>	final ConcurrentLinkedQueue<Item> q = new ConcurrentLinkedQueue<>();
487		q.add(one);
488		q.add(two);
489		q.add(three);
490	<	Iterator it = q.iterator();
490	>	Iterator<? extends Item> it = q.iterator();
491		it.next();
492		it.remove();
493		it = q.iterator();
494	<	assertEquals(it.next(), two);
495	<	assertEquals(it.next(), three);
494	>	assertSame(it.next(), two);
495	>	assertSame(it.next(), three);
496		assertFalse(it.hasNext());
497		}
498
499	<
500	<	public void testToString(){
501	<	ConcurrentLinkedQueue q = populatedQueue(SIZE);
499	>	/**
500	>	* toString contains toStrings of elements
501	>	*/
502	>	public void testToString() {
503	>	ConcurrentLinkedQueue<Item> q = populatedQueue(SIZE);
504		String s = q.toString();
505		for (int i = 0; i < SIZE; ++i) {
506	<	assertTrue(s.indexOf(String.valueOf(i)) >= 0);
506	>	assertTrue(s.contains(String.valueOf(i)));
507		}
508	<	}
508	>	}
509
510	<	public void testSerialization() {
511	<	ConcurrentLinkedQueue q = populatedQueue(SIZE);
512	<	try {
513	<	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
514	<	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
515	<	out.writeObject(q);
516	<	out.close();
517	<
518	<	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
519	<	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
520	<	ConcurrentLinkedQueue r = (ConcurrentLinkedQueue)in.readObject();
521	<	assertEquals(q.size(), r.size());
522	<	while (!q.isEmpty())
523	<	assertEquals(q.remove(), r.remove());
385	<	} catch(Exception e){
386	<	e.printStackTrace();
387	<	fail("unexpected exception");
510	>	/**
511	>	* A deserialized/reserialized queue has same elements in same order
512	>	*/
513	>	public void testSerialization() throws Exception {
514	>	Queue<Item> x = populatedQueue(SIZE);
515	>	Queue<Item> y = serialClone(x);
516	>
517	>	assertNotSame(x, y);
518	>	mustEqual(x.size(), y.size());
519	>	mustEqual(x.toString(), y.toString());
520	>	assertTrue(Arrays.equals(x.toArray(), y.toArray()));
521	>	while (!x.isEmpty()) {
522	>	assertFalse(y.isEmpty());
523	>	mustEqual(x.remove(), y.remove());
524		}
525	+	assertTrue(y.isEmpty());
526		}
527
528	+	/**
529	+	* remove(null), contains(null) always return false
530	+	*/
531	+	public void testNeverContainsNull() {
532	+	Collection<?>[] qs = {
533	+	new ConcurrentLinkedQueue<>(),
534	+	populatedQueue(2),
535	+	};
536	+
537	+	for (Collection<?> q : qs) {
538	+	assertFalse(q.contains(null));
539	+	assertFalse(q.remove(null));
540	+	}
541	+	}
542		}

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