test/tck/PriorityQueueTest.java

/*
 * Written by members of JCP JSR-166 Expert Group and released to the
 * public domain. Use, modify, and redistribute this code in any way
 * without acknowledgement. Other contributors include Andrew Wright,
 * Jeffrey Hayes, Pat Fischer, Mike Judd.
 */

import junit.framework.*;
import java.util.*;
import java.util.concurrent.*;
import java.io.*;

public class PriorityQueueTest extends JSR166TestCase {
    public static void main(String[] args) {
        junit.textui.TestRunner.run (suite());  
    }
    public static Test suite() {
        return new TestSuite(PriorityQueueTest.class);
    }

    static class MyReverseComparator implements Comparator { 
        public int compare(Object x, Object y) {
            int i = ((Integer)x).intValue();
            int j = ((Integer)y).intValue();
            if (i < j) return 1;
            if (i > j) return -1;
            return 0;
        }
    }

    /**
     * Create a queue of given size containing consecutive
     * Integers 0 ... n.
     */
    private PriorityQueue populatedQueue(int n) {
        PriorityQueue q = new PriorityQueue(n);
        assertTrue(q.isEmpty());
        for(int i = n-1; i >= 0; i-=2)
            assertTrue(q.offer(new Integer(i)));
        for(int i = (n & 1); i < n; i+=2)
            assertTrue(q.offer(new Integer(i)));
        assertFalse(q.isEmpty());
        assertEquals(n, q.size());
        return q;
    }
 
    /**
     * A new queue has unbounded capacity
     */
    public void testConstructor1() {
        assertEquals(0, new PriorityQueue(SIZE).size());
    }

    /**
     * Constructor throws IAE if  capacity argument nonpositive
     */
    public void testConstructor2() {
        try {
            PriorityQueue q = new PriorityQueue(0);
            shouldThrow();
        }
        catch (IllegalArgumentException success) {}
    }

    /**
     * Initializing from null Collection throws NPE
     */
    public void testConstructor3() {
        try {
            PriorityQueue q = new PriorityQueue((Collection)null);
            shouldThrow();
        }
        catch (NullPointerException success) {}
    }

    /**
     * Initializing from Collection of null elements throws NPE
     */
    public void testConstructor4() {
        try {
            Integer[] ints = new Integer[SIZE];
            PriorityQueue q = new PriorityQueue(Arrays.asList(ints));
            shouldThrow();
        }
        catch (NullPointerException success) {}
    }

    /**
     * Initializing from Collection with some null elements throws NPE
     */
    public void testConstructor5() {
        try {
            Integer[] ints = new Integer[SIZE];
            for (int i = 0; i < SIZE-1; ++i)
                ints[i] = new Integer(i);
            PriorityQueue q = new PriorityQueue(Arrays.asList(ints));
            shouldThrow();
        }
        catch (NullPointerException success) {}
    }

    /**
     * Queue contains all elements of collection used to initialize
     */
    public void testConstructor6() {
        try {
            Integer[] ints = new Integer[SIZE];
            for (int i = 0; i < SIZE; ++i)
                ints[i] = new Integer(i);
            PriorityQueue q = new PriorityQueue(Arrays.asList(ints));
            for (int i = 0; i < SIZE; ++i)
                assertEquals(ints[i], q.poll());
        }
        finally {}
    }

    /**
     * The comparator used in constructor is used
     */
    public void testConstructor7() {
        try {
            MyReverseComparator cmp = new MyReverseComparator();
            PriorityQueue q = new PriorityQueue(SIZE, cmp);
            assertEquals(cmp, q.comparator());
            Integer[] ints = new Integer[SIZE];
            for (int i = 0; i < SIZE; ++i)
                ints[i] = new Integer(i);
            q.addAll(Arrays.asList(ints));
            for (int i = SIZE-1; i >= 0; --i)
                assertEquals(ints[i], q.poll());
        }
        finally {}
    }

    /**
     * isEmpty is true before add, false after
     */
    public void testEmpty() {
        PriorityQueue q = new PriorityQueue(2);
        assertTrue(q.isEmpty());
        q.add(new Integer(1));
        assertFalse(q.isEmpty());
        q.add(new Integer(2));
        q.remove();
        q.remove();
        assertTrue(q.isEmpty());
    }

    /**
     * size changes when elements added and removed
     */
    public void testSize() {
        PriorityQueue q = populatedQueue(SIZE);
        for (int i = 0; i < SIZE; ++i) {
            assertEquals(SIZE-i, q.size());
            q.remove();
        }
        for (int i = 0; i < SIZE; ++i) {
            assertEquals(i, q.size());
            q.add(new Integer(i));
        }
    }

    /**
     * offer(null) throws NPE
     */
    public void testOfferNull() {
        try {
            PriorityQueue q = new PriorityQueue(1);
            q.offer(null);
            shouldThrow();
        } catch (NullPointerException success) { }   
    }

    /**
     * Offer of comparable element succeeds
     */
    public void testOffer() {
        PriorityQueue q = new PriorityQueue(1);
        assertTrue(q.offer(zero));
        assertTrue(q.offer(one));
    }

    /**
     * Offer of non-Comparable throws CCE
     */
    public void testOfferNonComparable() {
        try {
            PriorityQueue q = new PriorityQueue(1);
            q.offer(new Object());
            q.offer(new Object());
            q.offer(new Object());
            shouldThrow();
        }
        catch(ClassCastException success) {}
    }

    /**
     * add of comparable succeeds
     */
    public void testAdd() {
        PriorityQueue q = new PriorityQueue(SIZE);
        for (int i = 0; i < SIZE; ++i) {
            assertEquals(i, q.size());
            assertTrue(q.add(new Integer(i)));
        }
    }

    /**
     * addAll(null) throws NPE
     */
    public void testAddAll1() {
        try {
            PriorityQueue q = new PriorityQueue(1);
            q.addAll(null);
            shouldThrow();
        }
        catch (NullPointerException success) {}
    }
    /**
     * addAll of a collection with null elements throws NPE
     */
    public void testAddAll2() {
        try {
            PriorityQueue q = new PriorityQueue(SIZE);
            Integer[] ints = new Integer[SIZE];
            q.addAll(Arrays.asList(ints));
            shouldThrow();
        }
        catch (NullPointerException success) {}
    }
    /**
     * addAll of a collection with any null elements throws NPE after
     * possibly adding some elements
     */
    public void testAddAll3() {
        try {
            PriorityQueue q = new PriorityQueue(SIZE);
            Integer[] ints = new Integer[SIZE];
            for (int i = 0; i < SIZE-1; ++i)
                ints[i] = new Integer(i);
            q.addAll(Arrays.asList(ints));
            shouldThrow();
        }
        catch (NullPointerException success) {}
    }

    /**
     * Queue contains all elements of successful addAll
     */
    public void testAddAll5() {
        try {
            Integer[] empty = new Integer[0];
            Integer[] ints = new Integer[SIZE];
            for (int i = 0; i < SIZE; ++i)
                ints[i] = new Integer(SIZE-1-i);
            PriorityQueue q = new PriorityQueue(SIZE);
            assertFalse(q.addAll(Arrays.asList(empty)));
            assertTrue(q.addAll(Arrays.asList(ints)));
            for (int i = 0; i < SIZE; ++i)
                assertEquals(new Integer(i), q.poll());
        }
        finally {}
    }

    /**
     * poll succeeds unless empty
     */
    public void testPoll() {
        PriorityQueue q = populatedQueue(SIZE);
        for (int i = 0; i < SIZE; ++i) {
            assertEquals(i, ((Integer)q.poll()).intValue());
        }
        assertNull(q.poll());
    }

    /**
     * peek returns next element, or null if empty
     */
    public void testPeek() {
        PriorityQueue q = populatedQueue(SIZE);
        for (int i = 0; i < SIZE; ++i) {
            assertEquals(i, ((Integer)q.peek()).intValue());
            q.poll();
            assertTrue(q.peek() == null ||
                       i != ((Integer)q.peek()).intValue());
        }
        assertNull(q.peek());
    }

    /**
     * element returns next element, or throws NSEE if empty
     */
    public void testElement() {
        PriorityQueue q = populatedQueue(SIZE);
        for (int i = 0; i < SIZE; ++i) {
            assertEquals(i, ((Integer)q.element()).intValue());
            q.poll();
        }
        try {
            q.element();
            shouldThrow();
        }
        catch (NoSuchElementException success) {}
    }

    /**
     * remove removes next element, or throws NSEE if empty
     */
    public void testRemove() {
        PriorityQueue q = populatedQueue(SIZE);
        for (int i = 0; i < SIZE; ++i) {
            assertEquals(i, ((Integer)q.remove()).intValue());
        }
        try {
            q.remove();
            shouldThrow();
        } catch (NoSuchElementException success){
        }   
    }

    /**
     * remove(x) removes x and returns true if present
     */
    public void testRemoveElement() {
        PriorityQueue q = populatedQueue(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)));
        }
        assertTrue(q.isEmpty());
    }
        
    /**
     * contains(x) reports true when elements added but not yet removed
     */
    public void testContains() {
        PriorityQueue q = populatedQueue(SIZE);
        for (int i = 0; i < SIZE; ++i) {
            assertTrue(q.contains(new Integer(i)));
            q.poll();
            assertFalse(q.contains(new Integer(i)));
        }
    }

    /**
     * clear removes all elements
     */
    public void testClear() {
        PriorityQueue q = populatedQueue(SIZE);
        q.clear();
        assertTrue(q.isEmpty());
        assertEquals(0, q.size());
        q.add(new Integer(1));
        assertFalse(q.isEmpty());
        q.clear();
        assertTrue(q.isEmpty());
    }

    /**
     * containsAll(c) is true when c contains a subset of elements
     */
    public void testContainsAll() {
        PriorityQueue q = populatedQueue(SIZE);
        PriorityQueue p = new PriorityQueue(SIZE);
        for (int i = 0; i < SIZE; ++i) {
            assertTrue(q.containsAll(p));
            assertFalse(p.containsAll(q));
            p.add(new Integer(i));
        }
        assertTrue(p.containsAll(q));
    }

    /**
     * retainAll(c) retains only those elements of c and reports true if changed
     */
    public void testRetainAll() {
        PriorityQueue q = populatedQueue(SIZE);
        PriorityQueue p = populatedQueue(SIZE);
        for (int i = 0; i < SIZE; ++i) {
            boolean changed = q.retainAll(p);
            if (i == 0)
                assertFalse(changed);
            else
                assertTrue(changed);

            assertTrue(q.containsAll(p));
            assertEquals(SIZE-i, q.size());
            p.remove();
        }
    }

    /**
     * removeAll(c) removes only those elements of c and reports true if changed
     */
    public void testRemoveAll() {
        for (int i = 1; i < SIZE; ++i) {
            PriorityQueue q = populatedQueue(SIZE);
            PriorityQueue p = populatedQueue(i);
            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));
            }
        }
    }

    /**
     * toArray contains all elements
     */
    public void testToArray() {
        PriorityQueue q = populatedQueue(SIZE);
        Object[] o = q.toArray();
        Arrays.sort(o);
        for(int i = 0; i < o.length; i++)
            assertEquals(o[i], q.poll());
    }

    /**
     * toArray(a) contains all elements
     */
    public void testToArray2() {
        PriorityQueue q = populatedQueue(SIZE);
        Integer[] ints = new Integer[SIZE];
        ints = (Integer[])q.toArray(ints);
        Arrays.sort(ints);
        for(int i = 0; i < ints.length; i++)
            assertEquals(ints[i], q.poll());
    }
    
    /**
     * iterator iterates through all elements
     */
    public void testIterator() {
        PriorityQueue q = populatedQueue(SIZE);
        int i = 0;
        Iterator it = q.iterator();
        while(it.hasNext()) {
            assertTrue(q.contains(it.next()));
            ++i;
        }
        assertEquals(i, SIZE);
    }

    /**
     * iterator.remove removes current element
     */
    public void testIteratorRemove () {
        final PriorityQueue q = new PriorityQueue(3);
        q.add(new Integer(2));
        q.add(new Integer(1));
        q.add(new Integer(3));

        Iterator it = q.iterator();
        it.next();
        it.remove();

        it = q.iterator();
        assertEquals(it.next(), new Integer(2));
        assertEquals(it.next(), new Integer(3));
        assertFalse(it.hasNext());
    }


    /**
     * toString contains toStrings of elements
     */
    public void testToString() {
        PriorityQueue q = populatedQueue(SIZE);
        String s = q.toString();
        for (int i = 0; i < SIZE; ++i) {
            assertTrue(s.indexOf(String.valueOf(i)) >= 0);
        }
    }        

    /**
     * A deserialized serialized queue has same elements 
     */
    public void testSerialization() {
        PriorityQueue q = populatedQueue(SIZE);
        try {
            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));
            PriorityQueue r = (PriorityQueue)in.readObject();
            assertEquals(q.size(), r.size());
            while (!q.isEmpty()) 
                assertEquals(q.remove(), r.remove());
        } catch(Exception e){
            unexpectedException();
        }
    }
}
Revision:	1.6
Committed:	Thu Sep 25 11:02:41 2003 UTC (20 years, 7 months ago) by dl
Branch:	MAIN
Changes since 1.5:	+36 -39 lines
Log Message:	improve tck javadocs; rename and add a few tests
#	Content
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.
6	*/
7
8	import junit.framework.*;
9	import java.util.*;
10	import java.util.concurrent.*;
11	import java.io.*;
12
13	public class PriorityQueueTest extends JSR166TestCase {
14	public static void main(String[] args) {
15	junit.textui.TestRunner.run (suite());
16	}
17	public static Test suite() {
18	return new TestSuite(PriorityQueueTest.class);
19	}
20
21	static class MyReverseComparator implements Comparator {
22	public int compare(Object x, Object y) {
23	int i = ((Integer)x).intValue();
24	int j = ((Integer)y).intValue();
25	if (i < j) return 1;
26	if (i > j) return -1;
27	return 0;
28	}
29	}
30
31	/**
32	* Create a queue of given size containing consecutive
33	* Integers 0 ... n.
34	*/
35	private PriorityQueue populatedQueue(int n) {
36	PriorityQueue q = new PriorityQueue(n);
37	assertTrue(q.isEmpty());
38	for(int i = n-1; i >= 0; i-=2)
39	assertTrue(q.offer(new Integer(i)));
40	for(int i = (n & 1); i < n; i+=2)
41	assertTrue(q.offer(new Integer(i)));
42	assertFalse(q.isEmpty());
43	assertEquals(n, q.size());
44	return q;
45	}
46
47	/**
48	* A new queue has unbounded capacity
49	*/
50	public void testConstructor1() {
51	assertEquals(0, new PriorityQueue(SIZE).size());
52	}
53
54	/**
55	* Constructor throws IAE if capacity argument nonpositive
56	*/
57	public void testConstructor2() {
58	try {
59	PriorityQueue q = new PriorityQueue(0);
60	shouldThrow();
61	}
62	catch (IllegalArgumentException success) {}
63	}
64
65	/**
66	* Initializing from null Collection throws NPE
67	*/
68	public void testConstructor3() {
69	try {
70	PriorityQueue q = new PriorityQueue((Collection)null);
71	shouldThrow();
72	}
73	catch (NullPointerException success) {}
74	}
75
76	/**
77	* Initializing from Collection of null elements throws NPE
78	*/
79	public void testConstructor4() {
80	try {
81	Integer[] ints = new Integer[SIZE];
82	PriorityQueue q = new PriorityQueue(Arrays.asList(ints));
83	shouldThrow();
84	}
85	catch (NullPointerException success) {}
86	}
87
88	/**
89	* Initializing from Collection with some null elements throws NPE
90	*/
91	public void testConstructor5() {
92	try {
93	Integer[] ints = new Integer[SIZE];
94	for (int i = 0; i < SIZE-1; ++i)
95	ints[i] = new Integer(i);
96	PriorityQueue q = new PriorityQueue(Arrays.asList(ints));
97	shouldThrow();
98	}
99	catch (NullPointerException success) {}
100	}
101
102	/**
103	* Queue contains all elements of collection used to initialize
104	*/
105	public void testConstructor6() {
106	try {
107	Integer[] ints = new Integer[SIZE];
108	for (int i = 0; i < SIZE; ++i)
109	ints[i] = new Integer(i);
110	PriorityQueue q = new PriorityQueue(Arrays.asList(ints));
111	for (int i = 0; i < SIZE; ++i)
112	assertEquals(ints[i], q.poll());
113	}
114	finally {}
115	}
116
117	/**
118	* The comparator used in constructor is used
119	*/
120	public void testConstructor7() {
121	try {
122	MyReverseComparator cmp = new MyReverseComparator();
123	PriorityQueue q = new PriorityQueue(SIZE, cmp);
124	assertEquals(cmp, q.comparator());
125	Integer[] ints = new Integer[SIZE];
126	for (int i = 0; i < SIZE; ++i)
127	ints[i] = new Integer(i);
128	q.addAll(Arrays.asList(ints));
129	for (int i = SIZE-1; i >= 0; --i)
130	assertEquals(ints[i], q.poll());
131	}
132	finally {}
133	}
134
135	/**
136	* isEmpty is true before add, false after
137	*/
138	public void testEmpty() {
139	PriorityQueue q = new PriorityQueue(2);
140	assertTrue(q.isEmpty());
141	q.add(new Integer(1));
142	assertFalse(q.isEmpty());
143	q.add(new Integer(2));
144	q.remove();
145	q.remove();
146	assertTrue(q.isEmpty());
147	}
148
149	/**
150	* size changes when elements added and removed
151	*/
152	public void testSize() {
153	PriorityQueue q = populatedQueue(SIZE);
154	for (int i = 0; i < SIZE; ++i) {
155	assertEquals(SIZE-i, q.size());
156	q.remove();
157	}
158	for (int i = 0; i < SIZE; ++i) {
159	assertEquals(i, q.size());
160	q.add(new Integer(i));
161	}
162	}
163
164	/**
165	* offer(null) throws NPE
166	*/
167	public void testOfferNull() {
168	try {
169	PriorityQueue q = new PriorityQueue(1);
170	q.offer(null);
171	shouldThrow();
172	} catch (NullPointerException success) { }
173	}
174
175	/**
176	* Offer of comparable element succeeds
177	*/
178	public void testOffer() {
179	PriorityQueue q = new PriorityQueue(1);
180	assertTrue(q.offer(zero));
181	assertTrue(q.offer(one));
182	}
183
184	/**
185	* Offer of non-Comparable throws CCE
186	*/
187	public void testOfferNonComparable() {
188	try {
189	PriorityQueue q = new PriorityQueue(1);
190	q.offer(new Object());
191	q.offer(new Object());
192	q.offer(new Object());
193	shouldThrow();
194	}
195	catch(ClassCastException success) {}
196	}
197
198	/**
199	* add of comparable succeeds
200	*/
201	public void testAdd() {
202	PriorityQueue q = new PriorityQueue(SIZE);
203	for (int i = 0; i < SIZE; ++i) {
204	assertEquals(i, q.size());
205	assertTrue(q.add(new Integer(i)));
206	}
207	}
208
209	/**
210	* addAll(null) throws NPE
211	*/
212	public void testAddAll1() {
213	try {
214	PriorityQueue q = new PriorityQueue(1);
215	q.addAll(null);
216	shouldThrow();
217	}
218	catch (NullPointerException success) {}
219	}
220	/**
221	* addAll of a collection with null elements throws NPE
222	*/
223	public void testAddAll2() {
224	try {
225	PriorityQueue q = new PriorityQueue(SIZE);
226	Integer[] ints = new Integer[SIZE];
227	q.addAll(Arrays.asList(ints));
228	shouldThrow();
229	}
230	catch (NullPointerException success) {}
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	try {
238	PriorityQueue q = new PriorityQueue(SIZE);
239	Integer[] ints = new Integer[SIZE];
240	for (int i = 0; i < SIZE-1; ++i)
241	ints[i] = new Integer(i);
242	q.addAll(Arrays.asList(ints));
243	shouldThrow();
244	}
245	catch (NullPointerException success) {}
246	}
247
248	/**
249	* Queue contains all elements of successful addAll
250	*/
251	public void testAddAll5() {
252	try {
253	Integer[] empty = new Integer[0];
254	Integer[] ints = new Integer[SIZE];
255	for (int i = 0; i < SIZE; ++i)
256	ints[i] = new Integer(SIZE-1-i);
257	PriorityQueue q = new PriorityQueue(SIZE);
258	assertFalse(q.addAll(Arrays.asList(empty)));
259	assertTrue(q.addAll(Arrays.asList(ints)));
260	for (int i = 0; i < SIZE; ++i)
261	assertEquals(new Integer(i), q.poll());
262	}
263	finally {}
264	}
265
266	/**
267	* poll succeeds unless empty
268	*/
269	public void testPoll() {
270	PriorityQueue q = populatedQueue(SIZE);
271	for (int i = 0; i < SIZE; ++i) {
272	assertEquals(i, ((Integer)q.poll()).intValue());
273	}
274	assertNull(q.poll());
275	}
276
277	/**
278	* peek returns next element, or null if empty
279	*/
280	public void testPeek() {
281	PriorityQueue q = populatedQueue(SIZE);
282	for (int i = 0; i < SIZE; ++i) {
283	assertEquals(i, ((Integer)q.peek()).intValue());
284	q.poll();
285	assertTrue(q.peek() == null \|\|
286	i != ((Integer)q.peek()).intValue());
287	}
288	assertNull(q.peek());
289	}
290
291	/**
292	* element returns next element, or throws NSEE if empty
293	*/
294	public void testElement() {
295	PriorityQueue q = populatedQueue(SIZE);
296	for (int i = 0; i < SIZE; ++i) {
297	assertEquals(i, ((Integer)q.element()).intValue());
298	q.poll();
299	}
300	try {
301	q.element();
302	shouldThrow();
303	}
304	catch (NoSuchElementException success) {}
305	}
306
307	/**
308	* remove removes next element, or throws NSEE if empty
309	*/
310	public void testRemove() {
311	PriorityQueue q = populatedQueue(SIZE);
312	for (int i = 0; i < SIZE; ++i) {
313	assertEquals(i, ((Integer)q.remove()).intValue());
314	}
315	try {
316	q.remove();
317	shouldThrow();
318	} catch (NoSuchElementException success){
319	}
320	}
321
322	/**
323	* remove(x) removes x and returns true if present
324	*/
325	public void testRemoveElement() {
326	PriorityQueue q = populatedQueue(SIZE);
327	for (int i = 1; i < SIZE; i+=2) {
328	assertTrue(q.remove(new Integer(i)));
329	}
330	for (int i = 0; i < SIZE; i+=2) {
331	assertTrue(q.remove(new Integer(i)));
332	assertFalse(q.remove(new Integer(i+1)));
333	}
334	assertTrue(q.isEmpty());
335	}
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)));
344	q.poll();
345	assertFalse(q.contains(new Integer(i)));
346	}
347	}
348
349	/**
350	* clear removes all elements
351	*/
352	public void testClear() {
353	PriorityQueue q = populatedQueue(SIZE);
354	q.clear();
355	assertTrue(q.isEmpty());
356	assertEquals(0, q.size());
357	q.add(new Integer(1));
358	assertFalse(q.isEmpty());
359	q.clear();
360	assertTrue(q.isEmpty());
361	}
362
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) {
370	assertTrue(q.containsAll(p));
371	assertFalse(p.containsAll(q));
372	p.add(new Integer(i));
373	}
374	assertTrue(p.containsAll(q));
375	}
376
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) {
384	boolean changed = q.retainAll(p);
385	if (i == 0)
386	assertFalse(changed);
387	else
388	assertTrue(changed);
389
390	assertTrue(q.containsAll(p));
391	assertEquals(SIZE-i, q.size());
392	p.remove();
393	}
394	}
395
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());
405	for (int j = 0; j < i; ++j) {
406	Integer I = (Integer)(p.remove());
407	assertFalse(q.contains(I));
408	}
409	}
410	}
411
412	/**
413	* toArray contains all elements
414	*/
415	public void testToArray() {
416	PriorityQueue q = populatedQueue(SIZE);
417	Object[] o = q.toArray();
418	Arrays.sort(o);
419	for(int i = 0; i < o.length; i++)
420	assertEquals(o[i], q.poll());
421	}
422
423	/**
424	* toArray(a) contains all elements
425	*/
426	public void testToArray2() {
427	PriorityQueue q = populatedQueue(SIZE);
428	Integer[] ints = new Integer[SIZE];
429	ints = (Integer[])q.toArray(ints);
430	Arrays.sort(ints);
431	for(int i = 0; i < ints.length; i++)
432	assertEquals(ints[i], q.poll());
433	}
434
435	/**
436	* iterator iterates through all elements
437	*/
438	public void testIterator() {
439	PriorityQueue q = populatedQueue(SIZE);
440	int i = 0;
441	Iterator it = q.iterator();
442	while(it.hasNext()) {
443	assertTrue(q.contains(it.next()));
444	++i;
445	}
446	assertEquals(i, SIZE);
447	}
448
449	/**
450	* iterator.remove removes current element
451	*/
452	public void testIteratorRemove () {
453	final PriorityQueue q = new PriorityQueue(3);
454	q.add(new Integer(2));
455	q.add(new Integer(1));
456	q.add(new Integer(3));
457
458	Iterator it = q.iterator();
459	it.next();
460	it.remove();
461
462	it = q.iterator();
463	assertEquals(it.next(), new Integer(2));
464	assertEquals(it.next(), new Integer(3));
465	assertFalse(it.hasNext());
466	}
467
468
469	/**
470	* toString contains toStrings of elements
471	*/
472	public void testToString() {
473	PriorityQueue q = populatedQueue(SIZE);
474	String s = q.toString();
475	for (int i = 0; i < SIZE; ++i) {
476	assertTrue(s.indexOf(String.valueOf(i)) >= 0);
477	}
478	}
479
480	/**
481	* A deserialized serialized queue has same elements
482	*/
483	public void testSerialization() {
484	PriorityQueue q = populatedQueue(SIZE);
485	try {
486	ByteArrayOutputStream bout = new ByteArrayOutputStream(10000);
487	ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(bout));
488	out.writeObject(q);
489	out.close();
490
491	ByteArrayInputStream bin = new ByteArrayInputStream(bout.toByteArray());
492	ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(bin));
493	PriorityQueue r = (PriorityQueue)in.readObject();
494	assertEquals(q.size(), r.size());
495	while (!q.isEmpty())
496	assertEquals(q.remove(), r.remove());
497	} catch(Exception e){
498	unexpectedException();
499	}
500	}
501	}