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

Comparing jsr166/src/test/tck/ConcurrentLinkedQueueTest.java (file contents):
Revision 1.4 by dl, Sat Sep 20 18:20:07 2003 UTC vs.
Revision 1.49 by jsr166, Fri Jun 22 00:04:58 2018 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 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	>	* Integers 0 ... n - 1.
39		*/
40	<	private ConcurrentLinkedQueue populatedQueue(int n) {
41	<	ConcurrentLinkedQueue q = new ConcurrentLinkedQueue();
40	>	private static ConcurrentLinkedQueue<Integer> populatedQueue(int n) {
41	>	ConcurrentLinkedQueue<Integer> 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	>	assertTrue(q.offer(new Integer(i)));
45		assertFalse(q.isEmpty());
46	<	assertEquals(n, q.size());
46	>	assertEquals(n, q.size());
47	>	assertEquals((Integer) 0, q.peek());
48		return q;
49		}
50	<
50	>
51		/**
52	<	*
52	>	* new queue is empty
53		*/
54		public void testConstructor1() {
55		assertEquals(0, new ConcurrentLinkedQueue().size());
56		}
57
58		/**
59	<	*
59	>	* Initializing from null Collection throws NPE
60		*/
61		public void testConstructor3() {
62		try {
63	<	ConcurrentLinkedQueue q = new ConcurrentLinkedQueue((Collection)null);
63	>	new ConcurrentLinkedQueue((Collection)null);
64		shouldThrow();
65	<	}
52	<	catch (NullPointerException success) {}
65	>	} catch (NullPointerException success) {}
66		}
67
68		/**
69	<	*
69	>	* Initializing from Collection of null elements throws NPE
70		*/
71		public void testConstructor4() {
72		try {
73	<	Integer[] ints = new Integer[SIZE];
61	<	ConcurrentLinkedQueue q = new ConcurrentLinkedQueue(Arrays.asList(ints));
73	>	new ConcurrentLinkedQueue(Arrays.asList(new Integer[SIZE]));
74		shouldThrow();
75	<	}
64	<	catch (NullPointerException success) {}
75	>	} catch (NullPointerException success) {}
76		}
77
78		/**
79	<	*
79	>	* Initializing from Collection with some null elements throws NPE
80		*/
81		public void testConstructor5() {
82	+	Integer[] ints = new Integer[SIZE];
83	+	for (int i = 0; i < SIZE - 1; ++i)
84	+	ints[i] = new Integer(i);
85		try {
86	<	Integer[] ints = new Integer[SIZE];
73	<	for (int i = 0; i < SIZE-1; ++i)
74	<	ints[i] = new Integer(i);
75	<	ConcurrentLinkedQueue q = new ConcurrentLinkedQueue(Arrays.asList(ints));
86	>	new ConcurrentLinkedQueue(Arrays.asList(ints));
87		shouldThrow();
88	<	}
78	<	catch (NullPointerException success) {}
88	>	} catch (NullPointerException success) {}
89		}
90
91		/**
92	<	*
92	>	* Queue contains all elements of collection used to initialize
93		*/
94		public void testConstructor6() {
95	<	try {
96	<	Integer[] ints = new Integer[SIZE];
97	<	for (int i = 0; i < SIZE; ++i)
98	<	ints[i] = new Integer(i);
99	<	ConcurrentLinkedQueue q = new ConcurrentLinkedQueue(Arrays.asList(ints));
100	<	for (int i = 0; i < SIZE; ++i)
91	<	assertEquals(ints[i], q.poll());
92	<	}
93	<	finally {}
95	>	Integer[] ints = new Integer[SIZE];
96	>	for (int i = 0; i < SIZE; ++i)
97	>	ints[i] = new Integer(i);
98	>	ConcurrentLinkedQueue q = new ConcurrentLinkedQueue(Arrays.asList(ints));
99	>	for (int i = 0; i < SIZE; ++i)
100	>	assertEquals(ints[i], q.poll());
101		}
102
103		/**
104	<	*
104	>	* isEmpty is true before add, false after
105		*/
106		public void testEmpty() {
107		ConcurrentLinkedQueue q = new ConcurrentLinkedQueue();
#	Line 108 | Line 115 | public class ConcurrentLinkedQueueTest e
115		}
116
117		/**
118	<	*
118	>	* size changes when elements added and removed
119		*/
120		public void testSize() {
121		ConcurrentLinkedQueue q = populatedQueue(SIZE);
122		for (int i = 0; i < SIZE; ++i) {
123	<	assertEquals(SIZE-i, q.size());
123	>	assertEquals(SIZE - i, q.size());
124		q.remove();
125		}
126		for (int i = 0; i < SIZE; ++i) {
#	Line 123 | Line 130 | public class ConcurrentLinkedQueueTest e
130		}
131
132		/**
133	<	*
133	>	* offer(null) throws NPE
134		*/
135		public void testOfferNull() {
136	<	try {
137	<	ConcurrentLinkedQueue q = new ConcurrentLinkedQueue();
136	>	ConcurrentLinkedQueue q = new ConcurrentLinkedQueue();
137	>	try {
138		q.offer(null);
139		shouldThrow();
140	<	} catch (NullPointerException success) { }
140	>	} catch (NullPointerException success) {}
141	>	}
142	>
143	>	/**
144	>	* add(null) throws NPE
145	>	*/
146	>	public void testAddNull() {
147	>	ConcurrentLinkedQueue q = new ConcurrentLinkedQueue();
148	>	try {
149	>	q.add(null);
150	>	shouldThrow();
151	>	} catch (NullPointerException success) {}
152		}
153
154		/**
155	<	*
155	>	* Offer returns true
156		*/
157		public void testOffer() {
158		ConcurrentLinkedQueue q = new ConcurrentLinkedQueue();
#	Line 143 | Line 161 | public class ConcurrentLinkedQueueTest e
161		}
162
163		/**
164	<	*
164	>	* add returns true
165		*/
166		public void testAdd() {
167		ConcurrentLinkedQueue q = new ConcurrentLinkedQueue();
#	Line 154 | Line 172 | public class ConcurrentLinkedQueueTest e
172		}
173
174		/**
175	<	*
175	>	* addAll(null) throws NullPointerException
176		*/
177		public void testAddAll1() {
178	+	ConcurrentLinkedQueue q = new ConcurrentLinkedQueue();
179		try {
161	–	ConcurrentLinkedQueue q = new ConcurrentLinkedQueue();
180		q.addAll(null);
181		shouldThrow();
182	<	}
165	<	catch (NullPointerException success) {}
182	>	} catch (NullPointerException success) {}
183		}
184	+
185	+	/**
186	+	* addAll(this) throws IllegalArgumentException
187	+	*/
188	+	public void testAddAllSelf() {
189	+	ConcurrentLinkedQueue q = populatedQueue(SIZE);
190	+	try {
191	+	q.addAll(q);
192	+	shouldThrow();
193	+	} catch (IllegalArgumentException success) {}
194	+	}
195	+
196		/**
197	<	*
197	>	* addAll of a collection with null elements throws NullPointerException
198		*/
199		public void testAddAll2() {
200	+	ConcurrentLinkedQueue q = new ConcurrentLinkedQueue();
201		try {
202	<	ConcurrentLinkedQueue q = new ConcurrentLinkedQueue();
173	<	Integer[] ints = new Integer[SIZE];
174	<	q.addAll(Arrays.asList(ints));
202	>	q.addAll(Arrays.asList(new Integer[SIZE]));
203		shouldThrow();
204	<	}
177	<	catch (NullPointerException success) {}
204	>	} catch (NullPointerException success) {}
205		}
206	+
207		/**
208	<	*
208	>	* addAll of a collection with any null elements throws NPE after
209	>	* possibly adding some elements
210		*/
211		public void testAddAll3() {
212	+	ConcurrentLinkedQueue q = new ConcurrentLinkedQueue();
213	+	Integer[] ints = new Integer[SIZE];
214	+	for (int i = 0; i < SIZE - 1; ++i)
215	+	ints[i] = new Integer(i);
216		try {
184	–	ConcurrentLinkedQueue q = new ConcurrentLinkedQueue();
185	–	Integer[] ints = new Integer[SIZE];
186	–	for (int i = 0; i < SIZE-1; ++i)
187	–	ints[i] = new Integer(i);
217		q.addAll(Arrays.asList(ints));
218		shouldThrow();
219	<	}
191	<	catch (NullPointerException success) {}
219	>	} catch (NullPointerException success) {}
220		}
221
222		/**
223	<	*
223	>	* Queue contains all elements, in traversal order, of successful addAll
224		*/
225		public void testAddAll5() {
226	<	try {
227	<	Integer[] empty = new Integer[0];
228	<	Integer[] ints = new Integer[SIZE];
229	<	for (int i = 0; i < SIZE; ++i)
230	<	ints[i] = new Integer(i);
231	<	ConcurrentLinkedQueue q = new ConcurrentLinkedQueue();
232	<	assertFalse(q.addAll(Arrays.asList(empty)));
233	<	assertTrue(q.addAll(Arrays.asList(ints)));
234	<	for (int i = 0; i < SIZE; ++i)
207	<	assertEquals(ints[i], q.poll());
208	<	}
209	<	finally {}
226	>	Integer[] empty = new Integer[0];
227	>	Integer[] ints = new Integer[SIZE];
228	>	for (int i = 0; i < SIZE; ++i)
229	>	ints[i] = new Integer(i);
230	>	ConcurrentLinkedQueue q = new ConcurrentLinkedQueue();
231	>	assertFalse(q.addAll(Arrays.asList(empty)));
232	>	assertTrue(q.addAll(Arrays.asList(ints)));
233	>	for (int i = 0; i < SIZE; ++i)
234	>	assertEquals(ints[i], q.poll());
235		}
236
237		/**
238	<	*
238	>	* poll succeeds unless empty
239		*/
240		public void testPoll() {
241		ConcurrentLinkedQueue q = populatedQueue(SIZE);
242		for (int i = 0; i < SIZE; ++i) {
243	<	assertEquals(i, ((Integer)q.poll()).intValue());
243	>	assertEquals(i, q.poll());
244		}
245	<	assertNull(q.poll());
245	>	assertNull(q.poll());
246		}
247
248		/**
249	<	*
249	>	* peek returns next element, or null if empty
250		*/
251		public void testPeek() {
252		ConcurrentLinkedQueue q = populatedQueue(SIZE);
253		for (int i = 0; i < SIZE; ++i) {
254	<	assertEquals(i, ((Integer)q.peek()).intValue());
255	<	q.poll();
254	>	assertEquals(i, q.peek());
255	>	assertEquals(i, q.poll());
256		assertTrue(q.peek() == null ||
257	<	i != ((Integer)q.peek()).intValue());
257	>	!q.peek().equals(i));
258		}
259	<	assertNull(q.peek());
259	>	assertNull(q.peek());
260		}
261
262		/**
263	<	*
263	>	* element returns next element, or throws NSEE if empty
264		*/
265		public void testElement() {
266		ConcurrentLinkedQueue q = populatedQueue(SIZE);
267		for (int i = 0; i < SIZE; ++i) {
268	<	assertEquals(i, ((Integer)q.element()).intValue());
269	<	q.poll();
268	>	assertEquals(i, q.element());
269	>	assertEquals(i, q.poll());
270		}
271		try {
272		q.element();
273		shouldThrow();
274	<	}
250	<	catch (NoSuchElementException success) {}
274	>	} catch (NoSuchElementException success) {}
275		}
276
277		/**
278	<	*
278	>	* remove removes next element, or throws NSEE if empty
279		*/
280		public void testRemove() {
281		ConcurrentLinkedQueue q = populatedQueue(SIZE);
282		for (int i = 0; i < SIZE; ++i) {
283	<	assertEquals(i, ((Integer)q.remove()).intValue());
283	>	assertEquals(i, q.remove());
284		}
285		try {
286		q.remove();
287		shouldThrow();
288	<	} catch (NoSuchElementException success){
265	<	}
288	>	} catch (NoSuchElementException success) {}
289		}
290
291		/**
292	<	*
292	>	* remove(x) removes x and returns true if present
293		*/
294		public void testRemoveElement() {
295		ConcurrentLinkedQueue q = populatedQueue(SIZE);
296	<	for (int i = 1; i < SIZE; i+=2) {
297	<	assertTrue(q.remove(new Integer(i)));
298	<	}
299	<	for (int i = 0; i < SIZE; i+=2) {
300	<	assertTrue(q.remove(new Integer(i)));
301	<	assertFalse(q.remove(new Integer(i+1)));
296	>	for (int i = 1; i < SIZE; i += 2) {
297	>	assertTrue(q.contains(i));
298	>	assertTrue(q.remove(i));
299	>	assertFalse(q.contains(i));
300	>	assertTrue(q.contains(i - 1));
301	>	}
302	>	for (int i = 0; i < SIZE; i += 2) {
303	>	assertTrue(q.contains(i));
304	>	assertTrue(q.remove(i));
305	>	assertFalse(q.contains(i));
306	>	assertFalse(q.remove(i + 1));
307	>	assertFalse(q.contains(i + 1));
308		}
309		assertTrue(q.isEmpty());
310		}
311	<
311	>
312		/**
313	<	*
313	>	* contains(x) reports true when elements added but not yet removed
314		*/
315		public void testContains() {
316		ConcurrentLinkedQueue q = populatedQueue(SIZE);
#	Line 293 | Line 322 | public class ConcurrentLinkedQueueTest e
322		}
323
324		/**
325	<	*
325	>	* clear removes all elements
326		*/
327		public void testClear() {
328		ConcurrentLinkedQueue q = populatedQueue(SIZE);
#	Line 307 | Line 336 | public class ConcurrentLinkedQueueTest e
336		}
337
338		/**
339	<	*
339	>	* containsAll(c) is true when c contains a subset of elements
340		*/
341		public void testContainsAll() {
342		ConcurrentLinkedQueue q = populatedQueue(SIZE);
#	Line 321 | Line 350 | public class ConcurrentLinkedQueueTest e
350		}
351
352		/**
353	<	*
353	>	* retainAll(c) retains only those elements of c and reports true if change
354		*/
355		public void testRetainAll() {
356		ConcurrentLinkedQueue q = populatedQueue(SIZE);
#	Line 334 | Line 363 | public class ConcurrentLinkedQueueTest e
363		assertTrue(changed);
364
365		assertTrue(q.containsAll(p));
366	<	assertEquals(SIZE-i, q.size());
366	>	assertEquals(SIZE - i, q.size());
367		p.remove();
368		}
369		}
370
371		/**
372	<	*
372	>	* removeAll(c) removes only those elements of c and reports true if changed
373		*/
374		public void testRemoveAll() {
375		for (int i = 1; i < SIZE; ++i) {
376		ConcurrentLinkedQueue q = populatedQueue(SIZE);
377		ConcurrentLinkedQueue p = populatedQueue(i);
378		assertTrue(q.removeAll(p));
379	<	assertEquals(SIZE-i, q.size());
379	>	assertEquals(SIZE - i, q.size());
380		for (int j = 0; j < i; ++j) {
381	<	Integer I = (Integer)(p.remove());
382	<	assertFalse(q.contains(I));
381	>	Integer x = (Integer)(p.remove());
382	>	assertFalse(q.contains(x));
383		}
384		}
385		}
386
387		/**
388	<	*
388	>	* toArray contains all elements in FIFO order
389		*/
390		public void testToArray() {
391		ConcurrentLinkedQueue q = populatedQueue(SIZE);
392	<	Object[] o = q.toArray();
393	<	Arrays.sort(o);
394	<	for(int i = 0; i < o.length; i++)
395	<	assertEquals(o[i], q.poll());
392	>	Object[] a = q.toArray();
393	>	assertSame(Object[].class, a.getClass());
394	>	for (Object o : a)
395	>	assertSame(o, q.poll());
396	>	assertTrue(q.isEmpty());
397		}
398
399		/**
400	<	*
400	>	* toArray(a) contains all elements in FIFO order
401		*/
402		public void testToArray2() {
403	+	ConcurrentLinkedQueue<Integer> q = populatedQueue(SIZE);
404	+	Integer[] ints = new Integer[SIZE];
405	+	Integer[] array = q.toArray(ints);
406	+	assertSame(ints, array);
407	+	for (Integer o : ints)
408	+	assertSame(o, q.poll());
409	+	assertTrue(q.isEmpty());
410	+	}
411	+
412	+	/**
413	+	* toArray(null) throws NullPointerException
414	+	*/
415	+	public void testToArray_NullArg() {
416		ConcurrentLinkedQueue q = populatedQueue(SIZE);
417	<	Integer[] ints = new Integer[SIZE];
418	<	ints = (Integer[])q.toArray(ints);
419	<	Arrays.sort(ints);
420	<	for(int i = 0; i < ints.length; i++)
421	<	assertEquals(ints[i], q.poll());
417	>	try {
418	>	q.toArray((Object[])null);
419	>	shouldThrow();
420	>	} catch (NullPointerException success) {}
421	>	}
422	>
423	>	/**
424	>	* toArray(incompatible array type) throws ArrayStoreException
425	>	*/
426	>	public void testToArray1_BadArg() {
427	>	ConcurrentLinkedQueue q = populatedQueue(SIZE);
428	>	try {
429	>	q.toArray(new String[10]);
430	>	shouldThrow();
431	>	} catch (ArrayStoreException success) {}
432		}
433	<
433	>
434		/**
435	<	*
435	>	* iterator iterates through all elements
436		*/
437		public void testIterator() {
438		ConcurrentLinkedQueue q = populatedQueue(SIZE);
439	<	int i = 0;
440	<	Iterator it = q.iterator();
441	<	while(it.hasNext()) {
439	>	Iterator it = q.iterator();
440	>	int i;
441	>	for (i = 0; it.hasNext(); i++)
442		assertTrue(q.contains(it.next()));
390	–	++i;
391	–	}
443		assertEquals(i, SIZE);
444	+	assertIteratorExhausted(it);
445	+	}
446	+
447	+	/**
448	+	* iterator of empty collection has no elements
449	+	*/
450	+	public void testEmptyIterator() {
451	+	assertIteratorExhausted(new ConcurrentLinkedQueue().iterator());
452		}
453
454		/**
455	<	*
455	>	* iterator ordering is FIFO
456		*/
457		public void testIteratorOrdering() {
458		final ConcurrentLinkedQueue q = new ConcurrentLinkedQueue();
#	Line 403 | Line 462 | public class ConcurrentLinkedQueueTest e
462
463		int k = 0;
464		for (Iterator it = q.iterator(); it.hasNext();) {
465	<	int i = ((Integer)(it.next())).intValue();
407	<	assertEquals(++k, i);
465	>	assertEquals(++k, it.next());
466		}
467
468		assertEquals(3, k);
469		}
470
471		/**
472	<	*
472	>	* Modifications do not cause iterators to fail
473		*/
474	<	public void testWeaklyConsistentIteration () {
474	>	public void testWeaklyConsistentIteration() {
475		final ConcurrentLinkedQueue q = new ConcurrentLinkedQueue();
476		q.add(one);
477		q.add(two);
478		q.add(three);
479
480	<	try {
481	<	for (Iterator it = q.iterator(); it.hasNext();) {
482	<	q.remove();
425	<	it.next();
426	<	}
427	<	}
428	<	catch (ConcurrentModificationException e) {
429	<	shouldThrow();
480	>	for (Iterator it = q.iterator(); it.hasNext();) {
481	>	q.remove();
482	>	it.next();
483		}
484
485		assertEquals("queue should be empty again", 0, q.size());
486		}
487
488		/**
489	<	*
489	>	* iterator.remove removes current element
490		*/
491	<	public void testIteratorRemove () {
491	>	public void testIteratorRemove() {
492		final ConcurrentLinkedQueue q = new ConcurrentLinkedQueue();
493		q.add(one);
494		q.add(two);
#	Line 444 | Line 497 | public class ConcurrentLinkedQueueTest e
497		it.next();
498		it.remove();
499		it = q.iterator();
500	<	assertEquals(it.next(), two);
501	<	assertEquals(it.next(), three);
500	>	assertSame(it.next(), two);
501	>	assertSame(it.next(), three);
502		assertFalse(it.hasNext());
503		}
504
452	–
505		/**
506	<	*
506	>	* toString contains toStrings of elements
507		*/
508		public void testToString() {
509		ConcurrentLinkedQueue q = populatedQueue(SIZE);
510		String s = q.toString();
511		for (int i = 0; i < SIZE; ++i) {
512	<	assertTrue(s.indexOf(String.valueOf(i)) >= 0);
512	>	assertTrue(s.contains(String.valueOf(i)));
513		}
514	<	}
514	>	}
515
516		/**
517	<	*
517	>	* A deserialized/reserialized queue has same elements in same order
518		*/
519	<	public void testSerialization() {
520	<	ConcurrentLinkedQueue q = populatedQueue(SIZE);
521	<	try {
470	<	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
471	<	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
472	<	out.writeObject(q);
473	<	out.close();
519	>	public void testSerialization() throws Exception {
520	>	Queue x = populatedQueue(SIZE);
521	>	Queue y = serialClone(x);
522
523	<	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
524	<	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
525	<	ConcurrentLinkedQueue r = (ConcurrentLinkedQueue)in.readObject();
526	<	assertEquals(q.size(), r.size());
527	<	while (!q.isEmpty())
528	<	assertEquals(q.remove(), r.remove());
529	<	} catch(Exception e){
482	<	unexpectedException();
523	>	assertNotSame(x, y);
524	>	assertEquals(x.size(), y.size());
525	>	assertEquals(x.toString(), y.toString());
526	>	assertTrue(Arrays.equals(x.toArray(), y.toArray()));
527	>	while (!x.isEmpty()) {
528	>	assertFalse(y.isEmpty());
529	>	assertEquals(x.remove(), y.remove());
530		}
531	+	assertTrue(y.isEmpty());
532		}
533
534	+	/**
535	+	* remove(null), contains(null) always return false
536	+	*/
537	+	public void testNeverContainsNull() {
538	+	Collection<?>[] qs = {
539	+	new ConcurrentLinkedQueue<Object>(),
540	+	populatedQueue(2),
541	+	};
542	+
543	+	for (Collection<?> q : qs) {
544	+	assertFalse(q.contains(null));
545	+	assertFalse(q.remove(null));
546	+	}
547	+	}
548		}

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