test/tck/LinkedListTest.java

/*
 * Written by Doug Lea with assistance from members of JCP JSR-166
 * Expert Group and released to the public domain, as explained at
 * http://creativecommons.org/licenses/publicdomain
 * Other contributors include Andrew Wright, Jeffrey Hayes, 
 * Pat Fisher, Mike Judd. 
 */

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

public class LinkedListTest extends JSR166TestCase {
    public static void main(String[] args) {
        junit.textui.TestRunner.run (suite());  
    }

    public static Test suite() {
        return new TestSuite(LinkedListTest.class);
    }

    /**
     * Create a queue of given size containing consecutive
     * Integers 0 ... n.
     */
    private LinkedList populatedQueue(int n) {
        LinkedList q = new LinkedList();
        assertTrue(q.isEmpty());
        for(int i = 0; i < n; ++i)
            assertTrue(q.offer(new Integer(i)));
        assertFalse(q.isEmpty());
        assertEquals(n, q.size());
        return q;
    }
 
    /**
     * new queue is empty
     */
    public void testConstructor1() {
        assertEquals(0, new LinkedList().size());
    }

    /**
     * Initializing from null Collection throws NPE
     */
    public void testConstructor3() {
        try {
            LinkedList q = new LinkedList((Collection)null);
            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);
            LinkedList q = new LinkedList(Arrays.asList(ints));
            for (int i = 0; i < SIZE; ++i)
                assertEquals(ints[i], q.poll());
        }
        finally {}
    }

    /**
     * isEmpty is true before add, false after
     */
    public void testEmpty() {
        LinkedList q = new LinkedList();
        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() {
        LinkedList 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) succeeds
     */
    public void testOfferNull() {
        try {
            LinkedList q = new LinkedList();
            q.offer(null);
        } catch (NullPointerException ie) { 
            unexpectedException();
        }   
    }

    /**
     * Offer succeeds 
     */
    public void testOffer() {
        LinkedList q = new LinkedList();
        assertTrue(q.offer(new Integer(0)));
        assertTrue(q.offer(new Integer(1)));
    }

    /**
     * add succeeds
     */
    public void testAdd() {
        LinkedList q = new LinkedList();
        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 {
            LinkedList q = new LinkedList();
            q.addAll(null);
            shouldThrow();
        }
        catch (NullPointerException success) {}
    }

    /**
     * Queue contains all elements, in traversal order, 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(i);
            LinkedList q = new LinkedList();
            assertFalse(q.addAll(Arrays.asList(empty)));
            assertTrue(q.addAll(Arrays.asList(ints)));
            for (int i = 0; i < SIZE; ++i)
                assertEquals(ints[i], q.poll());
        }
        finally {}
    }

    /**
     * addAll with too large an index throws IOOBE
     */
    public void testAddAll2_IndexOutOfBoundsException() {
        try {
            LinkedList l = new LinkedList();
            l.add(new Object());
            LinkedList m = new LinkedList();
            m.add(new Object());
            l.addAll(4,m);
            shouldThrow();
        } catch(IndexOutOfBoundsException  success) {}
    }

    /**
     * addAll with negative index throws IOOBE
     */
    public void testAddAll4_BadIndex() {
        try {
            LinkedList l = new LinkedList();
            l.add(new Object());
            LinkedList m = new LinkedList();
            m.add(new Object());
            l.addAll(-1,m);
            shouldThrow();
        } catch(IndexOutOfBoundsException  success){}
    }

    /**
     *  poll succeeds unless empty
     */
    public void testPoll() {
        LinkedList 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() {
        LinkedList 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() {
        LinkedList 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() {
        LinkedList 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() {
        LinkedList 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() {
        LinkedList 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() {
        LinkedList 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() {
        LinkedList q = populatedQueue(SIZE);
        LinkedList p = new LinkedList();
        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() {
        LinkedList q = populatedQueue(SIZE);
        LinkedList 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) {
            LinkedList q = populatedQueue(SIZE);
            LinkedList 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() {
        LinkedList 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() {
        LinkedList 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());
    }

    /**
     * toArray(null) throws NPE
     */
    public void testToArray_BadArg() {
        try {
            LinkedList l = new LinkedList();
            l.add(new Object());
            Object o[] = l.toArray(null);
            shouldThrow();
        } catch(NullPointerException success){}
    }

    /**
     * toArray with incompatable aray type throws CCE
     */
    public void testToArray1_BadArg() {
        try {
            LinkedList l = new LinkedList();
            l.add(new Integer(5));
            Object o[] = l.toArray(new String[10] );
            shouldThrow();
        } catch(ArrayStoreException  success){}
    }
    
    /**
     *  iterator iterates through all elements
     */
    public void testIterator() {
        LinkedList q = populatedQueue(SIZE);
        int i = 0;
        Iterator it = q.iterator();
        while(it.hasNext()) {
            assertTrue(q.contains(it.next()));
            ++i;
        }
        assertEquals(i, SIZE);
    }

    /**
     *  iterator ordering is FIFO
     */
    public void testIteratorOrdering() {
        final LinkedList q = new LinkedList();
        q.add(new Integer(1));
        q.add(new Integer(2));
        q.add(new Integer(3));
        int k = 0;
        for (Iterator it = q.iterator(); it.hasNext();) {
            int i = ((Integer)(it.next())).intValue();
            assertEquals(++k, i);
        }

        assertEquals(3, k);
    }

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

    /**
     *  Descending iterator iterates through all elements
     */
    public void testDescendingIterator() {
        LinkedList q = populatedQueue(SIZE);
        int i = 0;
        Iterator it = q.descendingIterator();
        while(it.hasNext()) {
            assertTrue(q.contains(it.next()));
            ++i;
        }
        assertEquals(i, SIZE);
        assertFalse(it.hasNext());
        try {
            it.next();
        } catch(NoSuchElementException success) {
        }
    }

    /**
     *  Descending iterator ordering is reverse FIFO
     */
    public void testDescendingIteratorOrdering() {
        final LinkedList q = new LinkedList();
        q.add(new Integer(3));
        q.add(new Integer(2));
        q.add(new Integer(1));
        int k = 0;
        for (Iterator it = q.descendingIterator(); it.hasNext();) {
            int i = ((Integer)(it.next())).intValue();
            assertEquals(++k, i);
        }

        assertEquals(3, k);
    }

    /**
     * descendingIterator.remove removes current element
     */
    public void testDescendingIteratorRemove () {
        final LinkedList q = new LinkedList();
        q.add(new Integer(3));
        q.add(new Integer(2));
        q.add(new Integer(1));
        Iterator it = q.descendingIterator();
        it.next();
        it.remove();
        it = q.descendingIterator();
        assertEquals(it.next(), new Integer(2));
        assertEquals(it.next(), new Integer(3));
        assertFalse(it.hasNext());
    }


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

    /**
     * peek returns element inserted with addFirst
     */
    public void testAddFirst() {
        LinkedList q = populatedQueue(3);
        q.addFirst(four);
        assertEquals(four,q.peek());
    }   

    /**
     * peekFirst returns element inserted with push
     */
    public void testPush() {
        LinkedList q = populatedQueue(3);
        q.pollLast();
        q.push(four);
        assertEquals(four,q.peekFirst());
    }   

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

    /**
     * OfferFirst succeeds 
     */
    public void testOfferFirst() {
        LinkedList q = new LinkedList();
        assertTrue(q.offerFirst(new Integer(0)));
        assertTrue(q.offerFirst(new Integer(1)));
    }

    /**
     * OfferLast succeeds 
     */
    public void testOfferLast() {
        LinkedList q = new LinkedList();
        assertTrue(q.offerLast(new Integer(0)));
        assertTrue(q.offerLast(new Integer(1)));
    }

    /**
     *  pollLast succeeds unless empty
     */
    public void testPollLast() {
        LinkedList q = populatedQueue(SIZE);
        for (int i = SIZE-1; i >= 0; --i) {
            assertEquals(i, ((Integer)q.pollLast()).intValue());
        }
        assertNull(q.pollLast());
    }

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


    /**
     *  peekLast returns next element, or null if empty
     */
    public void testPeekLast() {
        LinkedList q = populatedQueue(SIZE);
        for (int i = SIZE-1; i >= 0; --i) {
            assertEquals(i, ((Integer)q.peekLast()).intValue());
            q.pollLast();
            assertTrue(q.peekLast() == null ||
                       i != ((Integer)q.peekLast()).intValue());
        }
        assertNull(q.peekLast());
    }

    public void testFirstElement() {
        LinkedList q = populatedQueue(SIZE);
        for (int i = 0; i < SIZE; ++i) {
            assertEquals(i, ((Integer)q.getFirst()).intValue());
            q.pollFirst();
        }
        try {
            q.getFirst();
            shouldThrow();
        }
        catch (NoSuchElementException success) {}
    }

    /**
     *  getLast returns next element, or throws NSEE if empty
     */
    public void testLastElement() {
        LinkedList q = populatedQueue(SIZE);
        for (int i = SIZE-1; i >= 0; --i) {
            assertEquals(i, ((Integer)q.getLast()).intValue());
            q.pollLast();
        }
        try {
            q.getLast();
            shouldThrow();
        }
        catch (NoSuchElementException success) {}
        assertNull(q.peekLast());
    }

    /**
     * removeFirstOccurrence(x) removes x and returns true if present
     */
    public void testRemoveFirstOccurrence() {
        LinkedList q = populatedQueue(SIZE);
        for (int i = 1; i < SIZE; i+=2) {
            assertTrue(q.removeFirstOccurrence(new Integer(i)));
        }
        for (int i = 0; i < SIZE; i+=2) {
            assertTrue(q.removeFirstOccurrence(new Integer(i)));
            assertFalse(q.removeFirstOccurrence(new Integer(i+1)));
        }
        assertTrue(q.isEmpty());
    }

    /**
     * removeLastOccurrence(x) removes x and returns true if present
     */
    public void testRemoveLastOccurrence() {
        LinkedList q = populatedQueue(SIZE);
        for (int i = 1; i < SIZE; i+=2) {
            assertTrue(q.removeLastOccurrence(new Integer(i)));
        }
        for (int i = 0; i < SIZE; i+=2) {
            assertTrue(q.removeLastOccurrence(new Integer(i)));
            assertFalse(q.removeLastOccurrence(new Integer(i+1)));
        }
        assertTrue(q.isEmpty());
    }

}
Revision:	1.9
Committed:	Wed Sep 14 23:50:31 2005 UTC (18 years, 8 months ago) by dl
Branch:	MAIN
Changes since 1.8:	+53 -0 lines
Log Message:	Test Deque.descendingIterator
#	Content
1	/*
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/licenses/publicdomain
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
13	public class LinkedListTest extends JSR166TestCase {
14	public static void main(String[] args) {
15	junit.textui.TestRunner.run (suite());
16	}
17
18	public static Test suite() {
19	return new TestSuite(LinkedListTest.class);
20	}
21
22	/**
23	* Create a queue of given size containing consecutive
24	* Integers 0 ... n.
25	*/
26	private LinkedList populatedQueue(int n) {
27	LinkedList q = new LinkedList();
28	assertTrue(q.isEmpty());
29	for(int i = 0; i < n; ++i)
30	assertTrue(q.offer(new Integer(i)));
31	assertFalse(q.isEmpty());
32	assertEquals(n, q.size());
33	return q;
34	}
35
36	/**
37	* new queue is empty
38	*/
39	public void testConstructor1() {
40	assertEquals(0, new LinkedList().size());
41	}
42
43	/**
44	* Initializing from null Collection throws NPE
45	*/
46	public void testConstructor3() {
47	try {
48	LinkedList q = new LinkedList((Collection)null);
49	shouldThrow();
50	}
51	catch (NullPointerException success) {}
52	}
53
54	/**
55	* Queue contains all elements of collection used to initialize
56
57	*/
58	public void testConstructor6() {
59	try {
60	Integer[] ints = new Integer[SIZE];
61	for (int i = 0; i < SIZE; ++i)
62	ints[i] = new Integer(i);
63	LinkedList q = new LinkedList(Arrays.asList(ints));
64	for (int i = 0; i < SIZE; ++i)
65	assertEquals(ints[i], q.poll());
66	}
67	finally {}
68	}
69
70	/**
71	* isEmpty is true before add, false after
72	*/
73	public void testEmpty() {
74	LinkedList q = new LinkedList();
75	assertTrue(q.isEmpty());
76	q.add(new Integer(1));
77	assertFalse(q.isEmpty());
78	q.add(new Integer(2));
79	q.remove();
80	q.remove();
81	assertTrue(q.isEmpty());
82	}
83
84	/**
85	* size changes when elements added and removed
86	*/
87	public void testSize() {
88	LinkedList q = populatedQueue(SIZE);
89	for (int i = 0; i < SIZE; ++i) {
90	assertEquals(SIZE-i, q.size());
91	q.remove();
92	}
93	for (int i = 0; i < SIZE; ++i) {
94	assertEquals(i, q.size());
95	q.add(new Integer(i));
96	}
97	}
98
99	/**
100	* offer(null) succeeds
101	*/
102	public void testOfferNull() {
103	try {
104	LinkedList q = new LinkedList();
105	q.offer(null);
106	} catch (NullPointerException ie) {
107	unexpectedException();
108	}
109	}
110
111	/**
112	* Offer succeeds
113	*/
114	public void testOffer() {
115	LinkedList q = new LinkedList();
116	assertTrue(q.offer(new Integer(0)));
117	assertTrue(q.offer(new Integer(1)));
118	}
119
120	/**
121	* add succeeds
122	*/
123	public void testAdd() {
124	LinkedList q = new LinkedList();
125	for (int i = 0; i < SIZE; ++i) {
126	assertEquals(i, q.size());
127	assertTrue(q.add(new Integer(i)));
128	}
129	}
130
131	/**
132	* addAll(null) throws NPE
133	*/
134	public void testAddAll1() {
135	try {
136	LinkedList q = new LinkedList();
137	q.addAll(null);
138	shouldThrow();
139	}
140	catch (NullPointerException success) {}
141	}
142
143	/**
144	* Queue contains all elements, in traversal order, of successful addAll
145	*/
146	public void testAddAll5() {
147	try {
148	Integer[] empty = new Integer[0];
149	Integer[] ints = new Integer[SIZE];
150	for (int i = 0; i < SIZE; ++i)
151	ints[i] = new Integer(i);
152	LinkedList q = new LinkedList();
153	assertFalse(q.addAll(Arrays.asList(empty)));
154	assertTrue(q.addAll(Arrays.asList(ints)));
155	for (int i = 0; i < SIZE; ++i)
156	assertEquals(ints[i], q.poll());
157	}
158	finally {}
159	}
160
161	/**
162	* addAll with too large an index throws IOOBE
163	*/
164	public void testAddAll2_IndexOutOfBoundsException() {
165	try {
166	LinkedList l = new LinkedList();
167	l.add(new Object());
168	LinkedList m = new LinkedList();
169	m.add(new Object());
170	l.addAll(4,m);
171	shouldThrow();
172	} catch(IndexOutOfBoundsException success) {}
173	}
174
175	/**
176	* addAll with negative index throws IOOBE
177	*/
178	public void testAddAll4_BadIndex() {
179	try {
180	LinkedList l = new LinkedList();
181	l.add(new Object());
182	LinkedList m = new LinkedList();
183	m.add(new Object());
184	l.addAll(-1,m);
185	shouldThrow();
186	} catch(IndexOutOfBoundsException success){}
187	}
188
189	/**
190	* poll succeeds unless empty
191	*/
192	public void testPoll() {
193	LinkedList q = populatedQueue(SIZE);
194	for (int i = 0; i < SIZE; ++i) {
195	assertEquals(i, ((Integer)q.poll()).intValue());
196	}
197	assertNull(q.poll());
198	}
199
200	/**
201	* peek returns next element, or null if empty
202	*/
203	public void testPeek() {
204	LinkedList q = populatedQueue(SIZE);
205	for (int i = 0; i < SIZE; ++i) {
206	assertEquals(i, ((Integer)q.peek()).intValue());
207	q.poll();
208	assertTrue(q.peek() == null \|\|
209	i != ((Integer)q.peek()).intValue());
210	}
211	assertNull(q.peek());
212	}
213
214	/**
215	* element returns next element, or throws NSEE if empty
216	*/
217	public void testElement() {
218	LinkedList q = populatedQueue(SIZE);
219	for (int i = 0; i < SIZE; ++i) {
220	assertEquals(i, ((Integer)q.element()).intValue());
221	q.poll();
222	}
223	try {
224	q.element();
225	shouldThrow();
226	}
227	catch (NoSuchElementException success) {}
228	}
229
230	/**
231	* remove removes next element, or throws NSEE if empty
232	*/
233	public void testRemove() {
234	LinkedList q = populatedQueue(SIZE);
235	for (int i = 0; i < SIZE; ++i) {
236	assertEquals(i, ((Integer)q.remove()).intValue());
237	}
238	try {
239	q.remove();
240	shouldThrow();
241	} catch (NoSuchElementException success){
242	}
243	}
244
245	/**
246	* remove(x) removes x and returns true if present
247	*/
248	public void testRemoveElement() {
249	LinkedList q = populatedQueue(SIZE);
250	for (int i = 1; i < SIZE; i+=2) {
251	assertTrue(q.remove(new Integer(i)));
252	}
253	for (int i = 0; i < SIZE; i+=2) {
254	assertTrue(q.remove(new Integer(i)));
255	assertFalse(q.remove(new Integer(i+1)));
256	}
257	assertTrue(q.isEmpty());
258	}
259
260	/**
261	* contains(x) reports true when elements added but not yet removed
262	*/
263	public void testContains() {
264	LinkedList q = populatedQueue(SIZE);
265	for (int i = 0; i < SIZE; ++i) {
266	assertTrue(q.contains(new Integer(i)));
267	q.poll();
268	assertFalse(q.contains(new Integer(i)));
269	}
270	}
271
272	/**
273	* clear removes all elements
274	*/
275	public void testClear() {
276	LinkedList q = populatedQueue(SIZE);
277	q.clear();
278	assertTrue(q.isEmpty());
279	assertEquals(0, q.size());
280	q.add(new Integer(1));
281	assertFalse(q.isEmpty());
282	q.clear();
283	assertTrue(q.isEmpty());
284	}
285
286	/**
287	* containsAll(c) is true when c contains a subset of elements
288	*/
289	public void testContainsAll() {
290	LinkedList q = populatedQueue(SIZE);
291	LinkedList p = new LinkedList();
292	for (int i = 0; i < SIZE; ++i) {
293	assertTrue(q.containsAll(p));
294	assertFalse(p.containsAll(q));
295	p.add(new Integer(i));
296	}
297	assertTrue(p.containsAll(q));
298	}
299
300	/**
301	* retainAll(c) retains only those elements of c and reports true if changed
302	*/
303	public void testRetainAll() {
304	LinkedList q = populatedQueue(SIZE);
305	LinkedList p = populatedQueue(SIZE);
306	for (int i = 0; i < SIZE; ++i) {
307	boolean changed = q.retainAll(p);
308	if (i == 0)
309	assertFalse(changed);
310	else
311	assertTrue(changed);
312
313	assertTrue(q.containsAll(p));
314	assertEquals(SIZE-i, q.size());
315	p.remove();
316	}
317	}
318
319	/**
320	* removeAll(c) removes only those elements of c and reports true if changed
321	*/
322	public void testRemoveAll() {
323	for (int i = 1; i < SIZE; ++i) {
324	LinkedList q = populatedQueue(SIZE);
325	LinkedList p = populatedQueue(i);
326	assertTrue(q.removeAll(p));
327	assertEquals(SIZE-i, q.size());
328	for (int j = 0; j < i; ++j) {
329	Integer I = (Integer)(p.remove());
330	assertFalse(q.contains(I));
331	}
332	}
333	}
334
335	/**
336	* toArray contains all elements
337	*/
338	public void testToArray() {
339	LinkedList q = populatedQueue(SIZE);
340	Object[] o = q.toArray();
341	Arrays.sort(o);
342	for(int i = 0; i < o.length; i++)
343	assertEquals(o[i], q.poll());
344	}
345
346	/**
347	* toArray(a) contains all elements
348	*/
349	public void testToArray2() {
350	LinkedList q = populatedQueue(SIZE);
351	Integer[] ints = new Integer[SIZE];
352	ints = (Integer[])q.toArray(ints);
353	Arrays.sort(ints);
354	for(int i = 0; i < ints.length; i++)
355	assertEquals(ints[i], q.poll());
356	}
357
358	/**
359	* toArray(null) throws NPE
360	*/
361	public void testToArray_BadArg() {
362	try {
363	LinkedList l = new LinkedList();
364	l.add(new Object());
365	Object o[] = l.toArray(null);
366	shouldThrow();
367	} catch(NullPointerException success){}
368	}
369
370	/**
371	* toArray with incompatable aray type throws CCE
372	*/
373	public void testToArray1_BadArg() {
374	try {
375	LinkedList l = new LinkedList();
376	l.add(new Integer(5));
377	Object o[] = l.toArray(new String[10] );
378	shouldThrow();
379	} catch(ArrayStoreException success){}
380	}
381
382	/**
383	* iterator iterates through all elements
384	*/
385	public void testIterator() {
386	LinkedList q = populatedQueue(SIZE);
387	int i = 0;
388	Iterator it = q.iterator();
389	while(it.hasNext()) {
390	assertTrue(q.contains(it.next()));
391	++i;
392	}
393	assertEquals(i, SIZE);
394	}
395
396	/**
397	* iterator ordering is FIFO
398	*/
399	public void testIteratorOrdering() {
400	final LinkedList q = new LinkedList();
401	q.add(new Integer(1));
402	q.add(new Integer(2));
403	q.add(new Integer(3));
404	int k = 0;
405	for (Iterator it = q.iterator(); it.hasNext();) {
406	int i = ((Integer)(it.next())).intValue();
407	assertEquals(++k, i);
408	}
409
410	assertEquals(3, k);
411	}
412
413	/**
414	* iterator.remove removes current element
415	*/
416	public void testIteratorRemove () {
417	final LinkedList q = new LinkedList();
418	q.add(new Integer(1));
419	q.add(new Integer(2));
420	q.add(new Integer(3));
421	Iterator it = q.iterator();
422	it.next();
423	it.remove();
424	it = q.iterator();
425	assertEquals(it.next(), new Integer(2));
426	assertEquals(it.next(), new Integer(3));
427	assertFalse(it.hasNext());
428	}
429
430	/**
431	* Descending iterator iterates through all elements
432	*/
433	public void testDescendingIterator() {
434	LinkedList q = populatedQueue(SIZE);
435	int i = 0;
436	Iterator it = q.descendingIterator();
437	while(it.hasNext()) {
438	assertTrue(q.contains(it.next()));
439	++i;
440	}
441	assertEquals(i, SIZE);
442	assertFalse(it.hasNext());
443	try {
444	it.next();
445	} catch(NoSuchElementException success) {
446	}
447	}
448
449	/**
450	* Descending iterator ordering is reverse FIFO
451	*/
452	public void testDescendingIteratorOrdering() {
453	final LinkedList q = new LinkedList();
454	q.add(new Integer(3));
455	q.add(new Integer(2));
456	q.add(new Integer(1));
457	int k = 0;
458	for (Iterator it = q.descendingIterator(); it.hasNext();) {
459	int i = ((Integer)(it.next())).intValue();
460	assertEquals(++k, i);
461	}
462
463	assertEquals(3, k);
464	}
465
466	/**
467	* descendingIterator.remove removes current element
468	*/
469	public void testDescendingIteratorRemove () {
470	final LinkedList q = new LinkedList();
471	q.add(new Integer(3));
472	q.add(new Integer(2));
473	q.add(new Integer(1));
474	Iterator it = q.descendingIterator();
475	it.next();
476	it.remove();
477	it = q.descendingIterator();
478	assertEquals(it.next(), new Integer(2));
479	assertEquals(it.next(), new Integer(3));
480	assertFalse(it.hasNext());
481	}
482
483
484	/**
485	* toString contains toStrings of elements
486	*/
487	public void testToString() {
488	LinkedList q = populatedQueue(SIZE);
489	String s = q.toString();
490	for (int i = 0; i < SIZE; ++i) {
491	assertTrue(s.indexOf(String.valueOf(i)) >= 0);
492	}
493	}
494
495	/**
496	* peek returns element inserted with addFirst
497	*/
498	public void testAddFirst() {
499	LinkedList q = populatedQueue(3);
500	q.addFirst(four);
501	assertEquals(four,q.peek());
502	}
503
504	/**
505	* peekFirst returns element inserted with push
506	*/
507	public void testPush() {
508	LinkedList q = populatedQueue(3);
509	q.pollLast();
510	q.push(four);
511	assertEquals(four,q.peekFirst());
512	}
513
514	/**
515	* pop removes next element, or throws NSEE if empty
516	*/
517	public void testPop() {
518	LinkedList q = populatedQueue(SIZE);
519	for (int i = 0; i < SIZE; ++i) {
520	assertEquals(i, ((Integer)q.pop()).intValue());
521	}
522	try {
523	q.pop();
524	shouldThrow();
525	} catch (NoSuchElementException success){
526	}
527	}
528
529	/**
530	* OfferFirst succeeds
531	*/
532	public void testOfferFirst() {
533	LinkedList q = new LinkedList();
534	assertTrue(q.offerFirst(new Integer(0)));
535	assertTrue(q.offerFirst(new Integer(1)));
536	}
537
538	/**
539	* OfferLast succeeds
540	*/
541	public void testOfferLast() {
542	LinkedList q = new LinkedList();
543	assertTrue(q.offerLast(new Integer(0)));
544	assertTrue(q.offerLast(new Integer(1)));
545	}
546
547	/**
548	* pollLast succeeds unless empty
549	*/
550	public void testPollLast() {
551	LinkedList q = populatedQueue(SIZE);
552	for (int i = SIZE-1; i >= 0; --i) {
553	assertEquals(i, ((Integer)q.pollLast()).intValue());
554	}
555	assertNull(q.pollLast());
556	}
557
558	/**
559	* peekFirst returns next element, or null if empty
560	*/
561	public void testPeekFirst() {
562	LinkedList q = populatedQueue(SIZE);
563	for (int i = 0; i < SIZE; ++i) {
564	assertEquals(i, ((Integer)q.peekFirst()).intValue());
565	q.pollFirst();
566	assertTrue(q.peekFirst() == null \|\|
567	i != ((Integer)q.peekFirst()).intValue());
568	}
569	assertNull(q.peekFirst());
570	}
571
572
573	/**
574	* peekLast returns next element, or null if empty
575	*/
576	public void testPeekLast() {
577	LinkedList q = populatedQueue(SIZE);
578	for (int i = SIZE-1; i >= 0; --i) {
579	assertEquals(i, ((Integer)q.peekLast()).intValue());
580	q.pollLast();
581	assertTrue(q.peekLast() == null \|\|
582	i != ((Integer)q.peekLast()).intValue());
583	}
584	assertNull(q.peekLast());
585	}
586
587	public void testFirstElement() {
588	LinkedList q = populatedQueue(SIZE);
589	for (int i = 0; i < SIZE; ++i) {
590	assertEquals(i, ((Integer)q.getFirst()).intValue());
591	q.pollFirst();
592	}
593	try {
594	q.getFirst();
595	shouldThrow();
596	}
597	catch (NoSuchElementException success) {}
598	}
599
600	/**
601	* getLast returns next element, or throws NSEE if empty
602	*/
603	public void testLastElement() {
604	LinkedList q = populatedQueue(SIZE);
605	for (int i = SIZE-1; i >= 0; --i) {
606	assertEquals(i, ((Integer)q.getLast()).intValue());
607	q.pollLast();
608	}
609	try {
610	q.getLast();
611	shouldThrow();
612	}
613	catch (NoSuchElementException success) {}
614	assertNull(q.peekLast());
615	}
616
617	/**
618	* removeFirstOccurrence(x) removes x and returns true if present
619	*/
620	public void testRemoveFirstOccurrence() {
621	LinkedList q = populatedQueue(SIZE);
622	for (int i = 1; i < SIZE; i+=2) {
623	assertTrue(q.removeFirstOccurrence(new Integer(i)));
624	}
625	for (int i = 0; i < SIZE; i+=2) {
626	assertTrue(q.removeFirstOccurrence(new Integer(i)));
627	assertFalse(q.removeFirstOccurrence(new Integer(i+1)));
628	}
629	assertTrue(q.isEmpty());
630	}
631
632	/**
633	* removeLastOccurrence(x) removes x and returns true if present
634	*/
635	public void testRemoveLastOccurrence() {
636	LinkedList q = populatedQueue(SIZE);
637	for (int i = 1; i < SIZE; i+=2) {
638	assertTrue(q.removeLastOccurrence(new Integer(i)));
639	}
640	for (int i = 0; i < SIZE; i+=2) {
641	assertTrue(q.removeLastOccurrence(new Integer(i)));
642	assertFalse(q.removeLastOccurrence(new Integer(i+1)));
643	}
644	assertTrue(q.isEmpty());
645	}
646
647	}