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

Comparing jsr166/src/test/tck/PriorityQueueTest.java (file contents):
Revision 1.4 by dl, Sat Sep 20 00:31:57 2003 UTC vs.
Revision 1.35 by jsr166, Sat May 23 00:53:08 2015 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.Comparator;
12	>	import java.util.Iterator;
13	>	import java.util.NoSuchElementException;
14	>	import java.util.PriorityQueue;
15	>	import java.util.Queue;
16
17	<	public class PriorityQueueTest extends JSR166TestCase {
17	>	import junit.framework.Test;
18	>	import junit.framework.TestSuite;
19
20	+	public class PriorityQueueTest extends JSR166TestCase {
21		public static void main(String[] args) {
22	<	junit.textui.TestRunner.run (suite());
22	>	main(suite(), args);
23		}
18	–
24		public static Test suite() {
25	<	return new TestSuite(PriorityQueueTest.class);
25	>	return new TestSuite(PriorityQueueTest.class);
26		}
27
28	<	static class MyReverseComparator implements Comparator {
28	>	static class MyReverseComparator implements Comparator {
29		public int compare(Object x, Object y) {
30	<	int i = ((Integer)x).intValue();
26	<	int j = ((Integer)y).intValue();
27	<	if (i < j) return 1;
28	<	if (i > j) return -1;
29	<	return 0;
30	>	return ((Comparable)y).compareTo(x);
31		}
32		}
33
33	–
34		/**
35	<	* Create a queue of given size containing consecutive
35	>	* Returns a new queue of given size containing consecutive
36		* Integers 0 ... n.
37		*/
38	<	private PriorityQueue populatedQueue(int n) {
39	<	PriorityQueue q = new PriorityQueue(n);
38	>	private PriorityQueue<Integer> populatedQueue(int n) {
39	>	PriorityQueue<Integer> q = new PriorityQueue<Integer>(n);
40		assertTrue(q.isEmpty());
41	<	for(int i = n-1; i >= 0; i-=2)
42	<	assertTrue(q.offer(new Integer(i)));
43	<	for(int i = (n & 1); i < n; i+=2)
44	<	assertTrue(q.offer(new Integer(i)));
41	>	for (int i = n-1; i >= 0; i -= 2)
42	>	assertTrue(q.offer(new Integer(i)));
43	>	for (int i = (n & 1); i < n; i += 2)
44	>	assertTrue(q.offer(new Integer(i)));
45		assertFalse(q.isEmpty());
46	<	assertEquals(n, q.size());
46	>	assertEquals(n, q.size());
47		return q;
48		}
49	<
50	<	public void testConstructor1(){
49	>
50	>	/**
51	>	* A new queue has unbounded capacity
52	>	*/
53	>	public void testConstructor1() {
54		assertEquals(0, new PriorityQueue(SIZE).size());
55		}
56
57	<	public void testConstructor2(){
57	>	/**
58	>	* Constructor throws IAE if capacity argument nonpositive
59	>	*/
60	>	public void testConstructor2() {
61		try {
62	<	PriorityQueue q = new PriorityQueue(0);
63	<	fail("Cannot make zero-sized");
64	<	}
59	<	catch (IllegalArgumentException success) {}
62	>	new PriorityQueue(0);
63	>	shouldThrow();
64	>	} catch (IllegalArgumentException success) {}
65		}
66
67	+	/**
68	+	* Initializing from null Collection throws NPE
69	+	*/
70		public void testConstructor3() {
63	–
71		try {
72	<	PriorityQueue q = new PriorityQueue((Collection)null);
73	<	fail("Cannot make from null collection");
74	<	}
68	<	catch (NullPointerException success) {}
72	>	new PriorityQueue((Collection)null);
73	>	shouldThrow();
74	>	} catch (NullPointerException success) {}
75		}
76
77	<	public void testConstructor4(){
77	>	/**
78	>	* Initializing from Collection of null elements throws NPE
79	>	*/
80	>	public void testConstructor4() {
81		try {
82	<	Integer[] ints = new Integer[SIZE];
83	<	PriorityQueue q = new PriorityQueue(Arrays.asList(ints));
84	<	fail("Cannot make with null elements");
76	<	}
77	<	catch (NullPointerException success) {}
82	>	new PriorityQueue(Arrays.asList(new Integer[SIZE]));
83	>	shouldThrow();
84	>	} catch (NullPointerException success) {}
85		}
86
87	<	public void testConstructor5(){
88	<	try {
89	<	Integer[] ints = new Integer[SIZE];
90	<	for (int i = 0; i < SIZE-1; ++i)
91	<	ints[i] = new Integer(i);
92	<	PriorityQueue q = new PriorityQueue(Arrays.asList(ints));
93	<	fail("Cannot make with null elements");
94	<	}
95	<	catch (NullPointerException success) {}
87	>	/**
88	>	* Initializing from Collection with some null elements throws NPE
89	>	*/
90	>	public void testConstructor5() {
91	>	Integer[] ints = new Integer[SIZE];
92	>	for (int i = 0; i < SIZE - 1; ++i)
93	>	ints[i] = new Integer(i);
94	>	try {
95	>	new PriorityQueue(Arrays.asList(ints));
96	>	shouldThrow();
97	>	} catch (NullPointerException success) {}
98		}
99
100	<	public void testConstructor6(){
101	<	try {
102	<	Integer[] ints = new Integer[SIZE];
103	<	for (int i = 0; i < SIZE; ++i)
104	<	ints[i] = new Integer(i);
105	<	PriorityQueue q = new PriorityQueue(Arrays.asList(ints));
106	<	for (int i = 0; i < SIZE; ++i)
107	<	assertEquals(ints[i], q.poll());
108	<	}
109	<	finally {}
100	>	/**
101	>	* Queue contains all elements of collection used to initialize
102	>	*/
103	>	public void testConstructor6() {
104	>	Integer[] ints = new Integer[SIZE];
105	>	for (int i = 0; i < SIZE; ++i)
106	>	ints[i] = new Integer(i);
107	>	PriorityQueue q = new PriorityQueue(Arrays.asList(ints));
108	>	for (int i = 0; i < SIZE; ++i)
109	>	assertEquals(ints[i], q.poll());
110		}
111
112	<	public void testConstructor7(){
113	<	try {
114	<	MyReverseComparator cmp = new MyReverseComparator();
115	<	PriorityQueue q = new PriorityQueue(SIZE, cmp);
116	<	assertEquals(cmp, q.comparator());
117	<	Integer[] ints = new Integer[SIZE];
118	<	for (int i = 0; i < SIZE; ++i)
119	<	ints[i] = new Integer(i);
120	<	q.addAll(Arrays.asList(ints));
121	<	for (int i = SIZE-1; i >= 0; --i)
122	<	assertEquals(ints[i], q.poll());
123	<	}
124	<	finally {}
112	>	/**
113	>	* The comparator used in constructor is used
114	>	*/
115	>	public void testConstructor7() {
116	>	MyReverseComparator cmp = new MyReverseComparator();
117	>	PriorityQueue q = new PriorityQueue(SIZE, cmp);
118	>	assertEquals(cmp, q.comparator());
119	>	Integer[] ints = new Integer[SIZE];
120	>	for (int i = 0; i < SIZE; ++i)
121	>	ints[i] = new Integer(i);
122	>	q.addAll(Arrays.asList(ints));
123	>	for (int i = SIZE - 1; i >= 0; --i)
124	>	assertEquals(ints[i], q.poll());
125		}
126
127	+	/**
128	+	* isEmpty is true before add, false after
129	+	*/
130		public void testEmpty() {
131		PriorityQueue q = new PriorityQueue(2);
132		assertTrue(q.isEmpty());
#	Line 126 | Line 138 | public class PriorityQueueTest extends J
138		assertTrue(q.isEmpty());
139		}
140
141	+	/**
142	+	* size changes when elements added and removed
143	+	*/
144		public void testSize() {
145		PriorityQueue q = populatedQueue(SIZE);
146		for (int i = 0; i < SIZE; ++i) {
147	<	assertEquals(SIZE-i, q.size());
147	>	assertEquals(SIZE - i, q.size());
148		q.remove();
149		}
150		for (int i = 0; i < SIZE; ++i) {
#	Line 138 | Line 153 | public class PriorityQueueTest extends J
153		}
154		}
155
156	<	public void testOfferNull(){
157	<	try {
158	<	PriorityQueue q = new PriorityQueue(1);
156	>	/**
157	>	* offer(null) throws NPE
158	>	*/
159	>	public void testOfferNull() {
160	>	PriorityQueue q = new PriorityQueue(1);
161	>	try {
162		q.offer(null);
163	<	fail("should throw NPE");
164	<	} catch (NullPointerException success) { }
163	>	shouldThrow();
164	>	} catch (NullPointerException success) {}
165		}
166
167	+	/**
168	+	* add(null) throws NPE
169	+	*/
170	+	public void testAddNull() {
171	+	PriorityQueue q = new PriorityQueue(1);
172	+	try {
173	+	q.add(null);
174	+	shouldThrow();
175	+	} catch (NullPointerException success) {}
176	+	}
177	+
178	+	/**
179	+	* Offer of comparable element succeeds
180	+	*/
181		public void testOffer() {
182		PriorityQueue q = new PriorityQueue(1);
183	<	assertTrue(q.offer(new Integer(0)));
184	<	assertTrue(q.offer(new Integer(1)));
183	>	assertTrue(q.offer(zero));
184	>	assertTrue(q.offer(one));
185		}
186
187	+	/**
188	+	* Offer of non-Comparable throws CCE
189	+	*/
190		public void testOfferNonComparable() {
191	+	PriorityQueue q = new PriorityQueue(1);
192		try {
157	–	PriorityQueue q = new PriorityQueue(1);
158	–	q.offer(new Object());
193		q.offer(new Object());
194		q.offer(new Object());
195	<	fail("should throw CCE");
196	<	}
163	<	catch(ClassCastException success) {}
195	>	shouldThrow();
196	>	} catch (ClassCastException success) {}
197		}
198
199	<	public void testAdd(){
199	>	/**
200	>	* add of comparable succeeds
201	>	*/
202	>	public void testAdd() {
203		PriorityQueue q = new PriorityQueue(SIZE);
204		for (int i = 0; i < SIZE; ++i) {
205		assertEquals(i, q.size());
#	Line 171 | Line 207 | public class PriorityQueueTest extends J
207		}
208		}
209
210	<	public void testAddAll1(){
210	>	/**
211	>	* addAll(null) throws NPE
212	>	*/
213	>	public void testAddAll1() {
214	>	PriorityQueue q = new PriorityQueue(1);
215		try {
176	–	PriorityQueue q = new PriorityQueue(1);
216		q.addAll(null);
217	<	fail("Cannot add null collection");
218	<	}
180	<	catch (NullPointerException success) {}
217	>	shouldThrow();
218	>	} catch (NullPointerException success) {}
219		}
220	<	public void testAddAll2(){
220	>
221	>	/**
222	>	* addAll of a collection with null elements throws NPE
223	>	*/
224	>	public void testAddAll2() {
225	>	PriorityQueue q = new PriorityQueue(SIZE);
226		try {
227	<	PriorityQueue q = new PriorityQueue(SIZE);
228	<	Integer[] ints = new Integer[SIZE];
229	<	q.addAll(Arrays.asList(ints));
187	<	fail("Cannot add null elements");
188	<	}
189	<	catch (NullPointerException success) {}
227	>	q.addAll(Arrays.asList(new Integer[SIZE]));
228	>	shouldThrow();
229	>	} catch (NullPointerException success) {}
230		}
231	<	public void testAddAll3(){
231	>
232	>	/**
233	>	* addAll of a collection with any null elements throws NPE after
234	>	* possibly adding some elements
235	>	*/
236	>	public void testAddAll3() {
237	>	PriorityQueue q = new PriorityQueue(SIZE);
238	>	Integer[] ints = new Integer[SIZE];
239	>	for (int i = 0; i < SIZE - 1; ++i)
240	>	ints[i] = new Integer(i);
241		try {
193	–	PriorityQueue q = new PriorityQueue(SIZE);
194	–	Integer[] ints = new Integer[SIZE];
195	–	for (int i = 0; i < SIZE-1; ++i)
196	–	ints[i] = new Integer(i);
242		q.addAll(Arrays.asList(ints));
243	<	fail("Cannot add null elements");
244	<	}
200	<	catch (NullPointerException success) {}
243	>	shouldThrow();
244	>	} catch (NullPointerException success) {}
245		}
246
247	<	public void testAddAll5(){
248	<	try {
249	<	Integer[] empty = new Integer[0];
250	<	Integer[] ints = new Integer[SIZE];
251	<	for (int i = 0; i < SIZE; ++i)
252	<	ints[i] = new Integer(SIZE-1-i);
253	<	PriorityQueue q = new PriorityQueue(SIZE);
254	<	assertFalse(q.addAll(Arrays.asList(empty)));
255	<	assertTrue(q.addAll(Arrays.asList(ints)));
256	<	for (int i = 0; i < SIZE; ++i)
257	<	assertEquals(new Integer(i), q.poll());
258	<	}
259	<	finally {}
247	>	/**
248	>	* Queue contains all elements of successful addAll
249	>	*/
250	>	public void testAddAll5() {
251	>	Integer[] empty = new Integer[0];
252	>	Integer[] ints = new Integer[SIZE];
253	>	for (int i = 0; i < SIZE; ++i)
254	>	ints[i] = new Integer(SIZE - 1 - i);
255	>	PriorityQueue q = new PriorityQueue(SIZE);
256	>	assertFalse(q.addAll(Arrays.asList(empty)));
257	>	assertTrue(q.addAll(Arrays.asList(ints)));
258	>	for (int i = 0; i < SIZE; ++i)
259	>	assertEquals(new Integer(i), q.poll());
260		}
261
262	<	public void testPoll(){
262	>	/**
263	>	* poll succeeds unless empty
264	>	*/
265	>	public void testPoll() {
266		PriorityQueue q = populatedQueue(SIZE);
267		for (int i = 0; i < SIZE; ++i) {
268	<	assertEquals(i, ((Integer)q.poll()).intValue());
268	>	assertEquals(i, q.poll());
269		}
270	<	assertNull(q.poll());
270	>	assertNull(q.poll());
271		}
272
273	<	public void testPeek(){
273	>	/**
274	>	* peek returns next element, or null if empty
275	>	*/
276	>	public void testPeek() {
277		PriorityQueue q = populatedQueue(SIZE);
278		for (int i = 0; i < SIZE; ++i) {
279	<	assertEquals(i, ((Integer)q.peek()).intValue());
280	<	q.poll();
279	>	assertEquals(i, q.peek());
280	>	assertEquals(i, q.poll());
281		assertTrue(q.peek() == null ||
282	<	i != ((Integer)q.peek()).intValue());
282	>	!q.peek().equals(i));
283		}
284	<	assertNull(q.peek());
284	>	assertNull(q.peek());
285		}
286
287	<	public void testElement(){
287	>	/**
288	>	* element returns next element, or throws NSEE if empty
289	>	*/
290	>	public void testElement() {
291		PriorityQueue q = populatedQueue(SIZE);
292		for (int i = 0; i < SIZE; ++i) {
293	<	assertEquals(i, ((Integer)q.element()).intValue());
294	<	q.poll();
293	>	assertEquals(i, q.element());
294	>	assertEquals(i, q.poll());
295		}
296		try {
297		q.element();
298	<	fail("no such element");
299	<	}
247	<	catch (NoSuchElementException success) {}
298	>	shouldThrow();
299	>	} catch (NoSuchElementException success) {}
300		}
301
302	<	public void testRemove(){
302	>	/**
303	>	* remove removes next element, or throws NSEE if empty
304	>	*/
305	>	public void testRemove() {
306		PriorityQueue q = populatedQueue(SIZE);
307		for (int i = 0; i < SIZE; ++i) {
308	<	assertEquals(i, ((Integer)q.remove()).intValue());
308	>	assertEquals(i, q.remove());
309		}
310		try {
311		q.remove();
312	<	fail("remove should throw");
313	<	} catch (NoSuchElementException success){
259	<	}
312	>	shouldThrow();
313	>	} catch (NoSuchElementException success) {}
314		}
315
316	<	public void testRemoveElement(){
316	>	/**
317	>	* remove(x) removes x and returns true if present
318	>	*/
319	>	public void testRemoveElement() {
320		PriorityQueue q = populatedQueue(SIZE);
321	<	for (int i = 1; i < SIZE; i+=2) {
322	<	assertTrue(q.remove(new Integer(i)));
323	<	}
324	<	for (int i = 0; i < SIZE; i+=2) {
325	<	assertTrue(q.remove(new Integer(i)));
326	<	assertFalse(q.remove(new Integer(i+1)));
321	>	for (int i = 1; i < SIZE; i += 2) {
322	>	assertTrue(q.contains(i));
323	>	assertTrue(q.remove(i));
324	>	assertFalse(q.contains(i));
325	>	assertTrue(q.contains(i-1));
326	>	}
327	>	for (int i = 0; i < SIZE; i += 2) {
328	>	assertTrue(q.contains(i));
329	>	assertTrue(q.remove(i));
330	>	assertFalse(q.contains(i));
331	>	assertFalse(q.remove(i+1));
332	>	assertFalse(q.contains(i+1));
333		}
334		assertTrue(q.isEmpty());
335		}
336	<
337	<	public void testContains(){
336	>
337	>	/**
338	>	* contains(x) reports true when elements added but not yet removed
339	>	*/
340	>	public void testContains() {
341		PriorityQueue q = populatedQueue(SIZE);
342		for (int i = 0; i < SIZE; ++i) {
343		assertTrue(q.contains(new Integer(i)));
#	Line 280 | Line 346 | public class PriorityQueueTest extends J
346		}
347		}
348
349	<	public void testClear(){
349	>	/**
350	>	* clear removes all elements
351	>	*/
352	>	public void testClear() {
353		PriorityQueue q = populatedQueue(SIZE);
354		q.clear();
355		assertTrue(q.isEmpty());
#	Line 291 | Line 360 | public class PriorityQueueTest extends J
360		assertTrue(q.isEmpty());
361		}
362
363	<	public void testContainsAll(){
363	>	/**
364	>	* containsAll(c) is true when c contains a subset of elements
365	>	*/
366	>	public void testContainsAll() {
367		PriorityQueue q = populatedQueue(SIZE);
368		PriorityQueue p = new PriorityQueue(SIZE);
369		for (int i = 0; i < SIZE; ++i) {
#	Line 302 | Line 374 | public class PriorityQueueTest extends J
374		assertTrue(p.containsAll(q));
375		}
376
377	<	public void testRetainAll(){
377	>	/**
378	>	* retainAll(c) retains only those elements of c and reports true if changed
379	>	*/
380	>	public void testRetainAll() {
381		PriorityQueue q = populatedQueue(SIZE);
382		PriorityQueue p = populatedQueue(SIZE);
383		for (int i = 0; i < SIZE; ++i) {
#	Line 313 | Line 388 | public class PriorityQueueTest extends J
388		assertTrue(changed);
389
390		assertTrue(q.containsAll(p));
391	<	assertEquals(SIZE-i, q.size());
391	>	assertEquals(SIZE - i, q.size());
392		p.remove();
393		}
394		}
395
396	<	public void testRemoveAll(){
396	>	/**
397	>	* removeAll(c) removes only those elements of c and reports true if changed
398	>	*/
399	>	public void testRemoveAll() {
400		for (int i = 1; i < SIZE; ++i) {
401		PriorityQueue q = populatedQueue(SIZE);
402		PriorityQueue p = populatedQueue(i);
403		assertTrue(q.removeAll(p));
404	<	assertEquals(SIZE-i, q.size());
404	>	assertEquals(SIZE - i, q.size());
405		for (int j = 0; j < i; ++j) {
406	<	Integer I = (Integer)(p.remove());
407	<	assertFalse(q.contains(I));
406	>	Integer x = (Integer)(p.remove());
407	>	assertFalse(q.contains(x));
408		}
409		}
410		}
411
412	<	public void testToArray(){
412	>	/**
413	>	* toArray contains all elements
414	>	*/
415	>	public void testToArray() {
416		PriorityQueue q = populatedQueue(SIZE);
417	<	Object[] o = q.toArray();
417	>	Object[] o = q.toArray();
418		Arrays.sort(o);
419	<	for(int i = 0; i < o.length; i++)
420	<	assertEquals(o[i], q.poll());
419	>	for (int i = 0; i < o.length; i++)
420	>	assertSame(o[i], q.poll());
421		}
422
423	<	public void testToArray2(){
424	<	PriorityQueue q = populatedQueue(SIZE);
425	<	Integer[] ints = new Integer[SIZE];
426	<	ints = (Integer[])q.toArray(ints);
423	>	/**
424	>	* toArray(a) contains all elements
425	>	*/
426	>	public void testToArray2() {
427	>	PriorityQueue<Integer> q = populatedQueue(SIZE);
428	>	Integer[] ints = new Integer[SIZE];
429	>	Integer[] array = q.toArray(ints);
430	>	assertSame(ints, array);
431		Arrays.sort(ints);
432	<	for(int i = 0; i < ints.length; i++)
433	<	assertEquals(ints[i], q.poll());
432	>	for (int i = 0; i < ints.length; i++)
433	>	assertSame(ints[i], q.poll());
434		}
435	<
436	<	public void testIterator(){
435	>
436	>	/**
437	>	* iterator iterates through all elements
438	>	*/
439	>	public void testIterator() {
440		PriorityQueue q = populatedQueue(SIZE);
441	<	int i = 0;
442	<	Iterator it = q.iterator();
443	<	while(it.hasNext()) {
441	>	Iterator it = q.iterator();
442	>	int i;
443	>	for (i = 0; it.hasNext(); i++)
444		assertTrue(q.contains(it.next()));
357	–	++i;
358	–	}
445		assertEquals(i, SIZE);
446	+	assertIteratorExhausted(it);
447		}
448
449	<	public void testIteratorRemove () {
449	>	/**
450	>	* iterator of empty collection has no elements
451	>	*/
452	>	public void testEmptyIterator() {
453	>	assertIteratorExhausted(new PriorityQueue().iterator());
454	>	}
455
456	+	/**
457	+	* iterator.remove removes current element
458	+	*/
459	+	public void testIteratorRemove() {
460		final PriorityQueue q = new PriorityQueue(3);
365	–
461		q.add(new Integer(2));
462		q.add(new Integer(1));
463		q.add(new Integer(3));
#	Line 377 | Line 472 | public class PriorityQueueTest extends J
472		assertFalse(it.hasNext());
473		}
474
475	<
476	<	public void testToString(){
475	>	/**
476	>	* toString contains toStrings of elements
477	>	*/
478	>	public void testToString() {
479		PriorityQueue q = populatedQueue(SIZE);
480		String s = q.toString();
481		for (int i = 0; i < SIZE; ++i) {
482	<	assertTrue(s.indexOf(String.valueOf(i)) >= 0);
482	>	assertTrue(s.contains(String.valueOf(i)));
483		}
484	<	}
484	>	}
485
486	<	public void testSerialization() {
487	<	PriorityQueue q = populatedQueue(SIZE);
488	<	try {
489	<	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
490	<	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
491	<	out.writeObject(q);
492	<	out.close();
493	<
494	<	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
495	<	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
496	<	PriorityQueue r = (PriorityQueue)in.readObject();
497	<	assertEquals(q.size(), r.size());
401	<	while (!q.isEmpty())
402	<	assertEquals(q.remove(), r.remove());
403	<	} catch(Exception e){
404	<	fail("unexpected exception");
486	>	/**
487	>	* A deserialized serialized queue has same elements
488	>	*/
489	>	public void testSerialization() throws Exception {
490	>	Queue x = populatedQueue(SIZE);
491	>	Queue y = serialClone(x);
492	>
493	>	assertNotSame(x, y);
494	>	assertEquals(x.size(), y.size());
495	>	while (!x.isEmpty()) {
496	>	assertFalse(y.isEmpty());
497	>	assertEquals(x.remove(), y.remove());
498		}
499	+	assertTrue(y.isEmpty());
500		}
501		}

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