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* Pat Fisher, Mike Judd. |
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*/ |
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import junit.framework.*; |
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import java.util.Arrays; |
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import java.util.Collection; |
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import java.util.Iterator; |
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import java.util.LinkedList; |
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import java.util.List; |
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import java.util.NoSuchElementException; |
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import java.util.concurrent.ThreadLocalRandom; |
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|
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import junit.framework.Test; |
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|
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public class LinkedListTest extends JSR166TestCase { |
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public static void main(String[] args) { |
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junit.textui.TestRunner.run(suite()); |
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main(suite(), args); |
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} |
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|
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public static Test suite() { |
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return new TestSuite(LinkedListTest.class); |
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class Implementation implements CollectionImplementation { |
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> |
public Class<?> klazz() { return LinkedList.class; } |
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> |
public List emptyCollection() { return new LinkedList(); } |
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> |
public Object makeElement(int i) { return i; } |
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> |
public boolean isConcurrent() { return false; } |
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> |
public boolean permitsNulls() { return true; } |
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> |
} |
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> |
class SubListImplementation extends Implementation { |
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> |
public List emptyCollection() { |
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List list = super.emptyCollection(); |
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> |
ThreadLocalRandom rnd = ThreadLocalRandom.current(); |
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if (rnd.nextBoolean()) |
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> |
list.add(makeElement(rnd.nextInt())); |
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int i = rnd.nextInt(list.size() + 1); |
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return list.subList(i, i); |
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} |
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} |
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return newTestSuite( |
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LinkedListTest.class, |
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CollectionTest.testSuite(new Implementation()), |
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CollectionTest.testSuite(new SubListImplementation())); |
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} |
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|
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/** |
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* Creates a queue of given size containing consecutive |
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* Integers 0 ... n. |
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* Returns a new queue of given size containing consecutive |
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* Integers 0 ... n - 1. |
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*/ |
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< |
private LinkedList<Integer> populatedQueue(int n) { |
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LinkedList<Integer> q = new LinkedList<Integer>(); |
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private static LinkedList<Integer> populatedQueue(int n) { |
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> |
LinkedList<Integer> q = new LinkedList<>(); |
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assertTrue(q.isEmpty()); |
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for (int i = 0; i < n; ++i) |
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assertTrue(q.offer(new Integer(i))); |
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assertFalse(q.isEmpty()); |
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assertEquals(n, q.size()); |
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assertEquals((Integer) 0, q.peekFirst()); |
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assertEquals((Integer) (n - 1), q.peekLast()); |
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return q; |
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} |
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|
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*/ |
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public void testConstructor3() { |
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try { |
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LinkedList q = new LinkedList((Collection)null); |
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new LinkedList((Collection)null); |
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shouldThrow(); |
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} catch (NullPointerException success) {} |
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} |
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public void testSize() { |
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LinkedList q = populatedQueue(SIZE); |
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for (int i = 0; i < SIZE; ++i) { |
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assertEquals(SIZE-i, q.size()); |
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> |
assertEquals(SIZE - i, q.size()); |
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q.remove(); |
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} |
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for (int i = 0; i < SIZE; ++i) { |
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public void testOfferNull() { |
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LinkedList q = new LinkedList(); |
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q.offer(null); |
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assertNull(q.get(0)); |
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assertTrue(q.contains(null)); |
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} |
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|
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/** |
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* addAll(null) throws NPE |
154 |
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*/ |
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public void testAddAll1() { |
156 |
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LinkedList q = new LinkedList(); |
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try { |
130 |
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LinkedList q = new LinkedList(); |
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q.addAll(null); |
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shouldThrow(); |
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} catch (NullPointerException success) {} |
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*/ |
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public void testRemoveElement() { |
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LinkedList q = populatedQueue(SIZE); |
265 |
< |
for (int i = 1; i < SIZE; i+=2) { |
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for (int i = 1; i < SIZE; i += 2) { |
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assertTrue(q.contains(i)); |
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assertTrue(q.remove((Integer)i)); |
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assertFalse(q.contains(i)); |
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< |
assertTrue(q.contains(i-1)); |
269 |
> |
assertTrue(q.contains(i - 1)); |
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} |
271 |
< |
for (int i = 0; i < SIZE; i+=2) { |
271 |
> |
for (int i = 0; i < SIZE; i += 2) { |
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assertTrue(q.contains(i)); |
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assertTrue(q.remove((Integer)i)); |
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assertFalse(q.contains(i)); |
275 |
< |
assertFalse(q.remove((Integer)(i+1))); |
276 |
< |
assertFalse(q.contains(i+1)); |
275 |
> |
assertFalse(q.remove((Integer)(i + 1))); |
276 |
> |
assertFalse(q.contains(i + 1)); |
277 |
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} |
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assertTrue(q.isEmpty()); |
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} |
332 |
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assertTrue(changed); |
333 |
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|
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assertTrue(q.containsAll(p)); |
335 |
< |
assertEquals(SIZE-i, q.size()); |
335 |
> |
assertEquals(SIZE - i, q.size()); |
336 |
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p.remove(); |
337 |
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} |
338 |
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} |
345 |
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LinkedList q = populatedQueue(SIZE); |
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LinkedList p = populatedQueue(i); |
347 |
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assertTrue(q.removeAll(p)); |
348 |
< |
assertEquals(SIZE-i, q.size()); |
348 |
> |
assertEquals(SIZE - i, q.size()); |
349 |
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for (int j = 0; j < i; ++j) { |
350 |
< |
Integer I = (Integer)(p.remove()); |
351 |
< |
assertFalse(q.contains(I)); |
350 |
> |
Integer x = (Integer)(p.remove()); |
351 |
> |
assertFalse(q.contains(x)); |
352 |
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} |
353 |
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} |
354 |
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} |
358 |
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*/ |
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public void testToArray() { |
360 |
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LinkedList q = populatedQueue(SIZE); |
361 |
< |
Object[] o = q.toArray(); |
362 |
< |
for (int i = 0; i < o.length; i++) |
363 |
< |
assertSame(o[i], q.poll()); |
361 |
> |
Object[] a = q.toArray(); |
362 |
> |
assertSame(Object[].class, a.getClass()); |
363 |
> |
for (Object o : a) |
364 |
> |
assertSame(o, q.poll()); |
365 |
> |
assertTrue(q.isEmpty()); |
366 |
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} |
367 |
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|
368 |
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/** |
373 |
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Integer[] ints = new Integer[SIZE]; |
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Integer[] array = q.toArray(ints); |
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assertSame(ints, array); |
376 |
< |
for (int i = 0; i < ints.length; i++) |
377 |
< |
assertSame(ints[i], q.poll()); |
376 |
> |
for (Integer o : ints) |
377 |
> |
assertSame(o, q.poll()); |
378 |
> |
assertTrue(q.isEmpty()); |
379 |
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} |
380 |
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|
381 |
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/** |
385 |
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LinkedList l = new LinkedList(); |
386 |
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l.add(new Object()); |
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try { |
388 |
< |
l.toArray(null); |
388 |
> |
l.toArray((Object[])null); |
389 |
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shouldThrow(); |
390 |
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} catch (NullPointerException success) {} |
391 |
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} |
407 |
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*/ |
408 |
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public void testIterator() { |
409 |
|
LinkedList q = populatedQueue(SIZE); |
380 |
– |
int i = 0; |
410 |
|
Iterator it = q.iterator(); |
411 |
< |
while (it.hasNext()) { |
411 |
> |
int i; |
412 |
> |
for (i = 0; it.hasNext(); i++) |
413 |
|
assertTrue(q.contains(it.next())); |
384 |
– |
++i; |
385 |
– |
} |
414 |
|
assertEquals(i, SIZE); |
415 |
+ |
assertIteratorExhausted(it); |
416 |
+ |
} |
417 |
+ |
|
418 |
+ |
/** |
419 |
+ |
* iterator of empty collection has no elements |
420 |
+ |
*/ |
421 |
+ |
public void testEmptyIterator() { |
422 |
+ |
assertIteratorExhausted(new LinkedList().iterator()); |
423 |
|
} |
424 |
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|
425 |
|
/** |
573 |
|
*/ |
574 |
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public void testPollLast() { |
575 |
|
LinkedList q = populatedQueue(SIZE); |
576 |
< |
for (int i = SIZE-1; i >= 0; --i) { |
576 |
> |
for (int i = SIZE - 1; i >= 0; --i) { |
577 |
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assertEquals(i, q.pollLast()); |
578 |
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} |
579 |
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assertNull(q.pollLast()); |
598 |
|
*/ |
599 |
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public void testPeekLast() { |
600 |
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LinkedList q = populatedQueue(SIZE); |
601 |
< |
for (int i = SIZE-1; i >= 0; --i) { |
601 |
> |
for (int i = SIZE - 1; i >= 0; --i) { |
602 |
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assertEquals(i, q.peekLast()); |
603 |
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assertEquals(i, q.pollLast()); |
604 |
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assertTrue(q.peekLast() == null || |
624 |
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*/ |
625 |
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public void testLastElement() { |
626 |
|
LinkedList q = populatedQueue(SIZE); |
627 |
< |
for (int i = SIZE-1; i >= 0; --i) { |
627 |
> |
for (int i = SIZE - 1; i >= 0; --i) { |
628 |
|
assertEquals(i, q.getLast()); |
629 |
|
assertEquals(i, q.pollLast()); |
630 |
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} |
640 |
|
*/ |
641 |
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public void testRemoveFirstOccurrence() { |
642 |
|
LinkedList q = populatedQueue(SIZE); |
643 |
< |
for (int i = 1; i < SIZE; i+=2) { |
643 |
> |
for (int i = 1; i < SIZE; i += 2) { |
644 |
|
assertTrue(q.removeFirstOccurrence(new Integer(i))); |
645 |
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} |
646 |
< |
for (int i = 0; i < SIZE; i+=2) { |
646 |
> |
for (int i = 0; i < SIZE; i += 2) { |
647 |
|
assertTrue(q.removeFirstOccurrence(new Integer(i))); |
648 |
< |
assertFalse(q.removeFirstOccurrence(new Integer(i+1))); |
648 |
> |
assertFalse(q.removeFirstOccurrence(new Integer(i + 1))); |
649 |
|
} |
650 |
|
assertTrue(q.isEmpty()); |
651 |
|
} |
655 |
|
*/ |
656 |
|
public void testRemoveLastOccurrence() { |
657 |
|
LinkedList q = populatedQueue(SIZE); |
658 |
< |
for (int i = 1; i < SIZE; i+=2) { |
658 |
> |
for (int i = 1; i < SIZE; i += 2) { |
659 |
|
assertTrue(q.removeLastOccurrence(new Integer(i))); |
660 |
|
} |
661 |
< |
for (int i = 0; i < SIZE; i+=2) { |
661 |
> |
for (int i = 0; i < SIZE; i += 2) { |
662 |
|
assertTrue(q.removeLastOccurrence(new Integer(i))); |
663 |
< |
assertFalse(q.removeLastOccurrence(new Integer(i+1))); |
663 |
> |
assertFalse(q.removeLastOccurrence(new Integer(i + 1))); |
664 |
|
} |
665 |
|
assertTrue(q.isEmpty()); |
666 |
|
} |