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

Comparing jsr166/src/test/tck/ConcurrentSkipListSetTest.java (file contents):
Revision 1.1 by dl, Tue Dec 28 16:15:59 2004 UTC vs.
Revision 1.18 by jsr166, Fri Nov 5 00:17:22 2010 UTC

#	Line 11 | Line 11 | import java.io.*;
11
12		public class ConcurrentSkipListSetTest extends JSR166TestCase {
13		public static void main(String[] args) {
14	<	junit.textui.TestRunner.run (suite());
14	>	junit.textui.TestRunner.run(suite());
15		}
16		public static Test suite() {
17	<	return new TestSuite(ConcurrentSkipListSetTest.class);
17	>	return new TestSuite(ConcurrentSkipListSetTest.class);
18		}
19
20	<	static class MyReverseComparator implements Comparator {
20	>	static class MyReverseComparator implements Comparator {
21		public int compare(Object x, Object y) {
22	<	int i = ((Integer)x).intValue();
23	<	int j = ((Integer)y).intValue();
24	<	if (i < j) return 1;
25	<	if (i > j) return -1;
26	<	return 0;
22	>	return ((Comparable)y).compareTo(x);
23		}
24		}
25
#	Line 31 | Line 27 | public class ConcurrentSkipListSetTest e
27		* Create a set of given size containing consecutive
28		* Integers 0 ... n.
29		*/
30	<	private ConcurrentSkipListSet populatedSet(int n) {
31	<	ConcurrentSkipListSet q = new ConcurrentSkipListSet();
30	>	private ConcurrentSkipListSet<Integer> populatedSet(int n) {
31	>	ConcurrentSkipListSet<Integer> q =
32	>	new ConcurrentSkipListSet<Integer>();
33		assertTrue(q.isEmpty());
34	<	for(int i = n-1; i >= 0; i-=2)
35	<	assertTrue(q.add(new Integer(i)));
36	<	for(int i = (n & 1); i < n; i+=2)
37	<	assertTrue(q.add(new Integer(i)));
34	>	for (int i = n-1; i >= 0; i-=2)
35	>	assertTrue(q.add(new Integer(i)));
36	>	for (int i = (n & 1); i < n; i+=2)
37	>	assertTrue(q.add(new Integer(i)));
38		assertFalse(q.isEmpty());
39	<	assertEquals(n, q.size());
39	>	assertEquals(n, q.size());
40		return q;
41		}
42
#	Line 54 | Line 51 | public class ConcurrentSkipListSetTest e
51		q.add(three);
52		q.add(four);
53		q.add(five);
54	<	assertEquals(5, q.size());
54	>	assertEquals(5, q.size());
55		return q;
56		}
57	<
57	>
58		/**
59		* A new set has unbounded capacity
60		*/
#	Line 72 | Line 69 | public class ConcurrentSkipListSetTest e
69		try {
70		ConcurrentSkipListSet q = new ConcurrentSkipListSet((Collection)null);
71		shouldThrow();
72	<	}
76	<	catch (NullPointerException success) {}
72	>	} catch (NullPointerException success) {}
73		}
74
75		/**
#	Line 84 | Line 80 | public class ConcurrentSkipListSetTest e
80		Integer[] ints = new Integer[SIZE];
81		ConcurrentSkipListSet q = new ConcurrentSkipListSet(Arrays.asList(ints));
82		shouldThrow();
83	<	}
88	<	catch (NullPointerException success) {}
83	>	} catch (NullPointerException success) {}
84		}
85
86		/**
#	Line 98 | Line 93 | public class ConcurrentSkipListSetTest e
93		ints[i] = new Integer(i);
94		ConcurrentSkipListSet q = new ConcurrentSkipListSet(Arrays.asList(ints));
95		shouldThrow();
96	<	}
102	<	catch (NullPointerException success) {}
96	>	} catch (NullPointerException success) {}
97		}
98
99		/**
100		* Set contains all elements of collection used to initialize
101		*/
102		public void testConstructor6() {
103	<	try {
104	<	Integer[] ints = new Integer[SIZE];
105	<	for (int i = 0; i < SIZE; ++i)
106	<	ints[i] = new Integer(i);
107	<	ConcurrentSkipListSet q = new ConcurrentSkipListSet(Arrays.asList(ints));
108	<	for (int i = 0; i < SIZE; ++i)
115	<	assertEquals(ints[i], q.pollFirst());
116	<	}
117	<	finally {}
103	>	Integer[] ints = new Integer[SIZE];
104	>	for (int i = 0; i < SIZE; ++i)
105	>	ints[i] = new Integer(i);
106	>	ConcurrentSkipListSet q = new ConcurrentSkipListSet(Arrays.asList(ints));
107	>	for (int i = 0; i < SIZE; ++i)
108	>	assertEquals(ints[i], q.pollFirst());
109		}
110
111		/**
112		* The comparator used in constructor is used
113		*/
114		public void testConstructor7() {
115	<	try {
116	<	MyReverseComparator cmp = new MyReverseComparator();
117	<	ConcurrentSkipListSet q = new ConcurrentSkipListSet(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)
133	<	assertEquals(ints[i], q.pollFirst());
134	<	}
135	<	finally {}
115	>	MyReverseComparator cmp = new MyReverseComparator();
116	>	ConcurrentSkipListSet q = new ConcurrentSkipListSet(cmp);
117	>	assertEquals(cmp, q.comparator());
118	>	Integer[] ints = new Integer[SIZE];
119	>	for (int i = 0; i < SIZE; ++i)
120	>	ints[i] = new Integer(i);
121	>	q.addAll(Arrays.asList(ints));
122	>	for (int i = SIZE-1; i >= 0; --i)
123	>	assertEquals(ints[i], q.pollFirst());
124		}
125
126		/**
#	Line 168 | Line 156 | public class ConcurrentSkipListSetTest e
156		* add(null) throws NPE
157		*/
158		public void testAddNull() {
159	<	try {
159	>	try {
160		ConcurrentSkipListSet q = new ConcurrentSkipListSet();
161		q.add(null);
162		shouldThrow();
163	<	} catch (NullPointerException success) { }
163	>	} catch (NullPointerException success) {}
164		}
165
166		/**
#	Line 203 | Line 191 | public class ConcurrentSkipListSetTest e
191		q.add(new Object());
192		q.add(new Object());
193		shouldThrow();
194	<	}
207	<	catch(ClassCastException success) {}
194	>	} catch (ClassCastException success) {}
195		}
196
197		/**
#	Line 215 | Line 202 | public class ConcurrentSkipListSetTest e
202		ConcurrentSkipListSet q = new ConcurrentSkipListSet();
203		q.addAll(null);
204		shouldThrow();
205	<	}
219	<	catch (NullPointerException success) {}
205	>	} catch (NullPointerException success) {}
206		}
207	+
208		/**
209		* addAll of a collection with null elements throws NPE
210		*/
#	Line 227 | Line 214 | public class ConcurrentSkipListSetTest e
214		Integer[] ints = new Integer[SIZE];
215		q.addAll(Arrays.asList(ints));
216		shouldThrow();
217	<	}
231	<	catch (NullPointerException success) {}
217	>	} catch (NullPointerException success) {}
218		}
219	+
220		/**
221		* addAll of a collection with any null elements throws NPE after
222		* possibly adding some elements
#	Line 242 | Line 229 | public class ConcurrentSkipListSetTest e
229		ints[i] = new Integer(i);
230		q.addAll(Arrays.asList(ints));
231		shouldThrow();
232	<	}
246	<	catch (NullPointerException success) {}
232	>	} catch (NullPointerException success) {}
233		}
234
235		/**
236		* Set contains all elements of successful addAll
237		*/
238		public void testAddAll5() {
239	<	try {
240	<	Integer[] empty = new Integer[0];
241	<	Integer[] ints = new Integer[SIZE];
242	<	for (int i = 0; i < SIZE; ++i)
243	<	ints[i] = new Integer(SIZE-1-i);
244	<	ConcurrentSkipListSet q = new ConcurrentSkipListSet();
245	<	assertFalse(q.addAll(Arrays.asList(empty)));
246	<	assertTrue(q.addAll(Arrays.asList(ints)));
247	<	for (int i = 0; i < SIZE; ++i)
262	<	assertEquals(new Integer(i), q.pollFirst());
263	<	}
264	<	finally {}
239	>	Integer[] empty = new Integer[0];
240	>	Integer[] ints = new Integer[SIZE];
241	>	for (int i = 0; i < SIZE; ++i)
242	>	ints[i] = new Integer(SIZE-1-i);
243	>	ConcurrentSkipListSet q = new ConcurrentSkipListSet();
244	>	assertFalse(q.addAll(Arrays.asList(empty)));
245	>	assertTrue(q.addAll(Arrays.asList(ints)));
246	>	for (int i = 0; i < SIZE; ++i)
247	>	assertEquals(i, q.pollFirst());
248		}
249
250		/**
#	Line 270 | Line 253 | public class ConcurrentSkipListSetTest e
253		public void testPollFirst() {
254		ConcurrentSkipListSet q = populatedSet(SIZE);
255		for (int i = 0; i < SIZE; ++i) {
256	<	assertEquals(i, ((Integer)q.pollFirst()).intValue());
256	>	assertEquals(i, q.pollFirst());
257		}
258	<	assertNull(q.pollFirst());
258	>	assertNull(q.pollFirst());
259		}
260
261		/**
#	Line 281 | Line 264 | public class ConcurrentSkipListSetTest e
264		public void testPollLast() {
265		ConcurrentSkipListSet q = populatedSet(SIZE);
266		for (int i = SIZE-1; i >= 0; --i) {
267	<	assertEquals(i, ((Integer)q.pollLast()).intValue());
267	>	assertEquals(i, q.pollLast());
268		}
269	<	assertNull(q.pollFirst());
269	>	assertNull(q.pollFirst());
270		}
271
272
#	Line 301 | Line 284 | public class ConcurrentSkipListSetTest e
284		}
285		assertTrue(q.isEmpty());
286		}
287	<
287	>
288		/**
289		* contains(x) reports true when elements added but not yet removed
290		*/
#	Line 377 | Line 360 | public class ConcurrentSkipListSetTest e
360		}
361		}
362
363	<
363	>
364
365		/**
366		* lower returns preceding element
#	Line 395 | Line 378 | public class ConcurrentSkipListSetTest e
378
379		Object e4 = q.lower(zero);
380		assertNull(e4);
398	–
381		}
382
383		/**
#	Line 414 | Line 396 | public class ConcurrentSkipListSetTest e
396
397		Object e4 = q.higher(six);
398		assertNull(e4);
417	–
399		}
400
401		/**
#	Line 433 | Line 414 | public class ConcurrentSkipListSetTest e
414
415		Object e4 = q.floor(zero);
416		assertNull(e4);
436	–
417		}
418
419		/**
#	Line 452 | Line 432 | public class ConcurrentSkipListSetTest e
432
433		Object e4 = q.ceiling(six);
434		assertNull(e4);
455	–
435		}
436
437		/**
438	<	* toArray contains all elements
438	>	* toArray contains all elements in sorted order
439		*/
440		public void testToArray() {
441		ConcurrentSkipListSet q = populatedSet(SIZE);
442	<	Object[] o = q.toArray();
443	<	Arrays.sort(o);
444	<	for(int i = 0; i < o.length; i++)
466	<	assertEquals(o[i], q.pollFirst());
442	>	Object[] o = q.toArray();
443	>	for (int i = 0; i < o.length; i++)
444	>	assertSame(o[i], q.pollFirst());
445		}
446
447		/**
448	<	* toArray(a) contains all elements
448	>	* toArray(a) contains all elements in sorted order
449		*/
450		public void testToArray2() {
451	<	ConcurrentSkipListSet q = populatedSet(SIZE);
452	<	Integer[] ints = new Integer[SIZE];
453	<	ints = (Integer[])q.toArray(ints);
454	<	Arrays.sort(ints);
455	<	for(int i = 0; i < ints.length; i++)
456	<	assertEquals(ints[i], q.pollFirst());
451	>	ConcurrentSkipListSet<Integer> q = populatedSet(SIZE);
452	>	Integer[] ints = new Integer[SIZE];
453	>	Integer[] array = q.toArray(ints);
454	>	assertSame(ints, array);
455	>	for (int i = 0; i < ints.length; i++)
456	>	assertSame(ints[i], q.pollFirst());
457		}
458	<
458	>
459		/**
460		* iterator iterates through all elements
461		*/
462		public void testIterator() {
463		ConcurrentSkipListSet q = populatedSet(SIZE);
464		int i = 0;
465	<	Iterator it = q.iterator();
466	<	while(it.hasNext()) {
465	>	Iterator it = q.iterator();
466	>	while (it.hasNext()) {
467		assertTrue(q.contains(it.next()));
468		++i;
469		}
#	Line 498 | Line 476 | public class ConcurrentSkipListSetTest e
476		public void testEmptyIterator() {
477		ConcurrentSkipListSet q = new ConcurrentSkipListSet();
478		int i = 0;
479	<	Iterator it = q.iterator();
480	<	while(it.hasNext()) {
479	>	Iterator it = q.iterator();
480	>	while (it.hasNext()) {
481		assertTrue(q.contains(it.next()));
482		++i;
483		}
#	Line 509 | Line 487 | public class ConcurrentSkipListSetTest e
487		/**
488		* iterator.remove removes current element
489		*/
490	<	public void testIteratorRemove () {
490	>	public void testIteratorRemove() {
491		final ConcurrentSkipListSet q = new ConcurrentSkipListSet();
492		q.add(new Integer(2));
493		q.add(new Integer(1));
#	Line 535 | Line 513 | public class ConcurrentSkipListSetTest e
513		for (int i = 0; i < SIZE; ++i) {
514		assertTrue(s.indexOf(String.valueOf(i)) >= 0);
515		}
516	<	}
516	>	}
517
518		/**
519	<	* A deserialized serialized set has same elements
519	>	* A deserialized serialized set has same elements
520		*/
521	<	public void testSerialization() {
521	>	public void testSerialization() throws Exception {
522		ConcurrentSkipListSet q = populatedSet(SIZE);
523	<	try {
524	<	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
525	<	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
526	<	out.writeObject(q);
527	<	out.close();
528	<
529	<	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
530	<	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
531	<	ConcurrentSkipListSet r = (ConcurrentSkipListSet)in.readObject();
532	<	assertEquals(q.size(), r.size());
533	<	while (!q.isEmpty())
556	<	assertEquals(q.pollFirst(), r.pollFirst());
557	<	} catch(Exception e){
558	<	e.printStackTrace();
559	<	unexpectedException();
560	<	}
523	>	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
524	>	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
525	>	out.writeObject(q);
526	>	out.close();
527	>
528	>	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
529	>	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
530	>	ConcurrentSkipListSet r = (ConcurrentSkipListSet)in.readObject();
531	>	assertEquals(q.size(), r.size());
532	>	while (!q.isEmpty())
533	>	assertEquals(q.pollFirst(), r.pollFirst());
534		}
535
536		/**
#	Line 679 | Line 652 | public class ConcurrentSkipListSetTest e
652		assertEquals(4, set.size());
653		}
654
655	+	Random rnd = new Random(666);
656	+	BitSet bs;
657	+
658	+	/**
659	+	* Subsets of subsets subdivide correctly
660	+	*/
661	+	public void testRecursiveSubSets() throws Exception {
662	+	int setSize = expensiveTests ? 1000 : 100;
663	+	Class cl = ConcurrentSkipListSet.class;
664	+
665	+	NavigableSet<Integer> set = newSet(cl);
666	+	bs = new BitSet(setSize);
667	+
668	+	populate(set, setSize);
669	+	check(set,                 0, setSize - 1, true);
670	+	check(set.descendingSet(), 0, setSize - 1, false);
671	+
672	+	mutateSet(set, 0, setSize - 1);
673	+	check(set,                 0, setSize - 1, true);
674	+	check(set.descendingSet(), 0, setSize - 1, false);
675	+
676	+	bashSubSet(set.subSet(0, true, setSize, false),
677	+	0, setSize - 1, true);
678	+	}
679	+
680	+	static NavigableSet<Integer> newSet(Class cl) throws Exception {
681	+	NavigableSet<Integer> result = (NavigableSet<Integer>) cl.newInstance();
682	+	assertEquals(result.size(), 0);
683	+	assertFalse(result.iterator().hasNext());
684	+	return result;
685	+	}
686	+
687	+	void populate(NavigableSet<Integer> set, int limit) {
688	+	for (int i = 0, n = 2 * limit / 3; i < n; i++) {
689	+	int element = rnd.nextInt(limit);
690	+	put(set, element);
691	+	}
692	+	}
693	+
694	+	void mutateSet(NavigableSet<Integer> set, int min, int max) {
695	+	int size = set.size();
696	+	int rangeSize = max - min + 1;
697	+
698	+	// Remove a bunch of entries directly
699	+	for (int i = 0, n = rangeSize / 2; i < n; i++) {
700	+	remove(set, min - 5 + rnd.nextInt(rangeSize + 10));
701	+	}
702	+
703	+	// Remove a bunch of entries with iterator
704	+	for (Iterator<Integer> it = set.iterator(); it.hasNext(); ) {
705	+	if (rnd.nextBoolean()) {
706	+	bs.clear(it.next());
707	+	it.remove();
708	+	}
709	+	}
710	+
711	+	// Add entries till we're back to original size
712	+	while (set.size() < size) {
713	+	int element = min + rnd.nextInt(rangeSize);
714	+	assertTrue(element >= min && element<= max);
715	+	put(set, element);
716	+	}
717	+	}
718	+
719	+	void mutateSubSet(NavigableSet<Integer> set, int min, int max) {
720	+	int size = set.size();
721	+	int rangeSize = max - min + 1;
722	+
723	+	// Remove a bunch of entries directly
724	+	for (int i = 0, n = rangeSize / 2; i < n; i++) {
725	+	remove(set, min - 5 + rnd.nextInt(rangeSize + 10));
726	+	}
727	+
728	+	// Remove a bunch of entries with iterator
729	+	for (Iterator<Integer> it = set.iterator(); it.hasNext(); ) {
730	+	if (rnd.nextBoolean()) {
731	+	bs.clear(it.next());
732	+	it.remove();
733	+	}
734	+	}
735	+
736	+	// Add entries till we're back to original size
737	+	while (set.size() < size) {
738	+	int element = min - 5 + rnd.nextInt(rangeSize + 10);
739	+	if (element >= min && element<= max) {
740	+	put(set, element);
741	+	} else {
742	+	try {
743	+	set.add(element);
744	+	shouldThrow();
745	+	} catch (IllegalArgumentException success) {}
746	+	}
747	+	}
748	+	}
749	+
750	+	void put(NavigableSet<Integer> set, int element) {
751	+	if (set.add(element))
752	+	bs.set(element);
753	+	}
754	+
755	+	void remove(NavigableSet<Integer> set, int element) {
756	+	if (set.remove(element))
757	+	bs.clear(element);
758	+	}
759	+
760	+	void bashSubSet(NavigableSet<Integer> set,
761	+	int min, int max, boolean ascending) {
762	+	check(set, min, max, ascending);
763	+	check(set.descendingSet(), min, max, !ascending);
764	+
765	+	mutateSubSet(set, min, max);
766	+	check(set, min, max, ascending);
767	+	check(set.descendingSet(), min, max, !ascending);
768	+
769	+	// Recurse
770	+	if (max - min < 2)
771	+	return;
772	+	int midPoint = (min + max) / 2;
773	+
774	+	// headSet - pick direction and endpoint inclusion randomly
775	+	boolean incl = rnd.nextBoolean();
776	+	NavigableSet<Integer> hm = set.headSet(midPoint, incl);
777	+	if (ascending) {
778	+	if (rnd.nextBoolean())
779	+	bashSubSet(hm, min, midPoint - (incl ? 0 : 1), true);
780	+	else
781	+	bashSubSet(hm.descendingSet(), min, midPoint - (incl ? 0 : 1),
782	+	false);
783	+	} else {
784	+	if (rnd.nextBoolean())
785	+	bashSubSet(hm, midPoint + (incl ? 0 : 1), max, false);
786	+	else
787	+	bashSubSet(hm.descendingSet(), midPoint + (incl ? 0 : 1), max,
788	+	true);
789	+	}
790	+
791	+	// tailSet - pick direction and endpoint inclusion randomly
792	+	incl = rnd.nextBoolean();
793	+	NavigableSet<Integer> tm = set.tailSet(midPoint,incl);
794	+	if (ascending) {
795	+	if (rnd.nextBoolean())
796	+	bashSubSet(tm, midPoint + (incl ? 0 : 1), max, true);
797	+	else
798	+	bashSubSet(tm.descendingSet(), midPoint + (incl ? 0 : 1), max,
799	+	false);
800	+	} else {
801	+	if (rnd.nextBoolean()) {
802	+	bashSubSet(tm, min, midPoint - (incl ? 0 : 1), false);
803	+	} else {
804	+	bashSubSet(tm.descendingSet(), min, midPoint - (incl ? 0 : 1),
805	+	true);
806	+	}
807	+	}
808	+
809	+	// subSet - pick direction and endpoint inclusion randomly
810	+	int rangeSize = max - min + 1;
811	+	int[] endpoints = new int[2];
812	+	endpoints[0] = min + rnd.nextInt(rangeSize);
813	+	endpoints[1] = min + rnd.nextInt(rangeSize);
814	+	Arrays.sort(endpoints);
815	+	boolean lowIncl = rnd.nextBoolean();
816	+	boolean highIncl = rnd.nextBoolean();
817	+	if (ascending) {
818	+	NavigableSet<Integer> sm = set.subSet(
819	+	endpoints[0], lowIncl, endpoints[1], highIncl);
820	+	if (rnd.nextBoolean())
821	+	bashSubSet(sm, endpoints[0] + (lowIncl ? 0 : 1),
822	+	endpoints[1] - (highIncl ? 0 : 1), true);
823	+	else
824	+	bashSubSet(sm.descendingSet(), endpoints[0] + (lowIncl ? 0 : 1),
825	+	endpoints[1] - (highIncl ? 0 : 1), false);
826	+	} else {
827	+	NavigableSet<Integer> sm = set.subSet(
828	+	endpoints[1], highIncl, endpoints[0], lowIncl);
829	+	if (rnd.nextBoolean())
830	+	bashSubSet(sm, endpoints[0] + (lowIncl ? 0 : 1),
831	+	endpoints[1] - (highIncl ? 0 : 1), false);
832	+	else
833	+	bashSubSet(sm.descendingSet(), endpoints[0] + (lowIncl ? 0 : 1),
834	+	endpoints[1] - (highIncl ? 0 : 1), true);
835	+	}
836	+	}
837	+
838	+	/**
839	+	* min and max are both inclusive.  If max < min, interval is empty.
840	+	*/
841	+	void check(NavigableSet<Integer> set,
842	+	final int min, final int max, final boolean ascending) {
843	+	class ReferenceSet {
844	+	int lower(int element) {
845	+	return ascending ?
846	+	lowerAscending(element) : higherAscending(element);
847	+	}
848	+	int floor(int element) {
849	+	return ascending ?
850	+	floorAscending(element) : ceilingAscending(element);
851	+	}
852	+	int ceiling(int element) {
853	+	return ascending ?
854	+	ceilingAscending(element) : floorAscending(element);
855	+	}
856	+	int higher(int element) {
857	+	return ascending ?
858	+	higherAscending(element) : lowerAscending(element);
859	+	}
860	+	int first() {
861	+	return ascending ? firstAscending() : lastAscending();
862	+	}
863	+	int last() {
864	+	return ascending ? lastAscending() : firstAscending();
865	+	}
866	+	int lowerAscending(int element) {
867	+	return floorAscending(element - 1);
868	+	}
869	+	int floorAscending(int element) {
870	+	if (element < min)
871	+	return -1;
872	+	else if (element > max)
873	+	element = max;
874	+
875	+	// BitSet should support this! Test would run much faster
876	+	while (element >= min) {
877	+	if (bs.get(element))
878	+	return element;
879	+	element--;
880	+	}
881	+	return -1;
882	+	}
883	+	int ceilingAscending(int element) {
884	+	if (element < min)
885	+	element = min;
886	+	else if (element > max)
887	+	return -1;
888	+	int result = bs.nextSetBit(element);
889	+	return result > max ? -1 : result;
890	+	}
891	+	int higherAscending(int element) {
892	+	return ceilingAscending(element + 1);
893	+	}
894	+	private int firstAscending() {
895	+	int result = ceilingAscending(min);
896	+	return result > max ? -1 : result;
897	+	}
898	+	private int lastAscending() {
899	+	int result = floorAscending(max);
900	+	return result < min ? -1 : result;
901	+	}
902	+	}
903	+	ReferenceSet rs = new ReferenceSet();
904	+
905	+	// Test contents using containsElement
906	+	int size = 0;
907	+	for (int i = min; i <= max; i++) {
908	+	boolean bsContainsI = bs.get(i);
909	+	assertEquals(bsContainsI, set.contains(i));
910	+	if (bsContainsI)
911	+	size++;
912	+	}
913	+	assertEquals(set.size(), size);
914	+
915	+	// Test contents using contains elementSet iterator
916	+	int size2 = 0;
917	+	int previousElement = -1;
918	+	for (int element : set) {
919	+	assertTrue(bs.get(element));
920	+	size2++;
921	+	assertTrue(previousElement < 0 || (ascending ?
922	+	element - previousElement > 0 : element - previousElement < 0));
923	+	previousElement = element;
924	+	}
925	+	assertEquals(size2, size);
926	+
927	+	// Test navigation ops
928	+	for (int element = min - 1; element <= max + 1; element++) {
929	+	assertEq(set.lower(element), rs.lower(element));
930	+	assertEq(set.floor(element), rs.floor(element));
931	+	assertEq(set.higher(element), rs.higher(element));
932	+	assertEq(set.ceiling(element), rs.ceiling(element));
933	+	}
934	+
935	+	// Test extrema
936	+	if (set.size() != 0) {
937	+	assertEq(set.first(), rs.first());
938	+	assertEq(set.last(), rs.last());
939	+	} else {
940	+	assertEq(rs.first(), -1);
941	+	assertEq(rs.last(),  -1);
942	+	try {
943	+	set.first();
944	+	shouldThrow();
945	+	} catch (NoSuchElementException success) {}
946	+	try {
947	+	set.last();
948	+	shouldThrow();
949	+	} catch (NoSuchElementException success) {}
950	+	}
951	+	}
952	+
953	+	static void assertEq(Integer i, int j) {
954	+	if (i == null)
955	+	assertEquals(j, -1);
956	+	else
957	+	assertEquals((int) i, j);
958	+	}
959	+
960	+	static boolean eq(Integer i, int j) {
961	+	return i == null ? j == -1 : i == j;
962	+	}
963	+
964		}

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