--- jsr166/src/test/tck/LinkedListTest.java 2003/10/05 23:00:40 1.6 +++ jsr166/src/test/tck/LinkedListTest.java 2018/05/28 21:19:50 1.48 @@ -1,37 +1,66 @@ /* - * 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. + * 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/publicdomain/zero/1.0/ + * Other contributors include Andrew Wright, Jeffrey Hayes, + * Pat Fisher, Mike Judd. */ -import junit.framework.*; -import java.util.*; -import java.util.concurrent.*; +import java.util.Arrays; +import java.util.Collection; +import java.util.Iterator; +import java.util.LinkedList; +import java.util.List; +import java.util.NoSuchElementException; +import java.util.concurrent.ThreadLocalRandom; + +import junit.framework.Test; public class LinkedListTest extends JSR166TestCase { public static void main(String[] args) { - junit.textui.TestRunner.run (suite()); + main(suite(), args); } public static Test suite() { - return new TestSuite(LinkedListTest.class); + class Implementation implements CollectionImplementation { + public Class klazz() { return LinkedList.class; } + public List emptyCollection() { return new LinkedList(); } + public Object makeElement(int i) { return i; } + public boolean isConcurrent() { return false; } + public boolean permitsNulls() { return true; } + } + class SubListImplementation extends Implementation { + public List emptyCollection() { + List list = super.emptyCollection(); + ThreadLocalRandom rnd = ThreadLocalRandom.current(); + if (rnd.nextBoolean()) + list.add(makeElement(rnd.nextInt())); + int i = rnd.nextInt(list.size() + 1); + return list.subList(i, i); + } + } + return newTestSuite( + LinkedListTest.class, + CollectionTest.testSuite(new Implementation()), + CollectionTest.testSuite(new SubListImplementation())); } /** - * Create a queue of given size containing consecutive - * Integers 0 ... n. + * Returns a new queue of given size containing consecutive + * Integers 0 ... n - 1. */ - private LinkedList populatedQueue(int n) { - LinkedList q = new LinkedList(); + private static LinkedList populatedQueue(int n) { + LinkedList q = new LinkedList<>(); assertTrue(q.isEmpty()); - for(int i = 0; i < n; ++i) - assertTrue(q.offer(new Integer(i))); + for (int i = 0; i < n; ++i) + assertTrue(q.offer(new Integer(i))); assertFalse(q.isEmpty()); - assertEquals(n, q.size()); + assertEquals(n, q.size()); + assertEquals((Integer) 0, q.peekFirst()); + assertEquals((Integer) (n - 1), q.peekLast()); return q; } - + /** * new queue is empty */ @@ -44,26 +73,21 @@ public class LinkedListTest extends JSR1 */ public void testConstructor3() { try { - LinkedList q = new LinkedList((Collection)null); + new LinkedList((Collection)null); shouldThrow(); - } - catch (NullPointerException success) {} + } 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 {} + Integer[] ints = new Integer[SIZE]; + for (int i = 0; i < SIZE; ++i) + ints[i] = i; + LinkedList q = new LinkedList(Arrays.asList(ints)); + for (int i = 0; i < SIZE; ++i) + assertEquals(ints[i], q.poll()); } /** @@ -86,7 +110,7 @@ public class LinkedListTest extends JSR1 public void testSize() { LinkedList q = populatedQueue(SIZE); for (int i = 0; i < SIZE; ++i) { - assertEquals(SIZE-i, q.size()); + assertEquals(SIZE - i, q.size()); q.remove(); } for (int i = 0; i < SIZE; ++i) { @@ -99,16 +123,14 @@ public class LinkedListTest extends JSR1 * offer(null) succeeds */ public void testOfferNull() { - try { - LinkedList q = new LinkedList(); - q.offer(null); - } catch (NullPointerException ie) { - unexpectedException(); - } + LinkedList q = new LinkedList(); + q.offer(null); + assertNull(q.get(0)); + assertTrue(q.contains(null)); } /** - * Offer succeeds + * Offer succeeds */ public void testOffer() { LinkedList q = new LinkedList(); @@ -131,83 +153,79 @@ public class LinkedListTest extends JSR1 * addAll(null) throws NPE */ public void testAddAll1() { + LinkedList q = new LinkedList(); try { - LinkedList q = new LinkedList(); q.addAll(null); shouldThrow(); - } - catch (NullPointerException success) {} + } 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 {} + Integer[] empty = new Integer[0]; + Integer[] ints = new Integer[SIZE]; + for (int i = 0; i < SIZE; ++i) + ints[i] = 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()); } /** * 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) {} + LinkedList l = new LinkedList(); + l.add(new Object()); + LinkedList m = new LinkedList(); + m.add(new Object()); + try { + 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){} + LinkedList l = new LinkedList(); + l.add(new Object()); + LinkedList m = new LinkedList(); + m.add(new Object()); + try { + l.addAll(-1,m); + shouldThrow(); + } catch (IndexOutOfBoundsException success) {} } /** - * poll succeeds unless empty + * poll succeeds unless empty */ public void testPoll() { LinkedList q = populatedQueue(SIZE); for (int i = 0; i < SIZE; ++i) { - assertEquals(i, ((Integer)q.poll()).intValue()); + assertEquals(i, q.poll()); } - assertNull(q.poll()); + assertNull(q.poll()); } /** - * peek returns next element, or null if empty + * 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(); + assertEquals(i, q.peek()); + assertEquals(i, q.poll()); assertTrue(q.peek() == null || - i != ((Integer)q.peek()).intValue()); + !q.peek().equals(i)); } - assertNull(q.peek()); + assertNull(q.peek()); } /** @@ -216,29 +234,27 @@ public class LinkedListTest extends JSR1 public void testElement() { LinkedList q = populatedQueue(SIZE); for (int i = 0; i < SIZE; ++i) { - assertEquals(i, ((Integer)q.element()).intValue()); - q.poll(); + assertEquals(i, q.element()); + assertEquals(i, q.poll()); } try { q.element(); shouldThrow(); - } - catch (NoSuchElementException success) {} + } catch (NoSuchElementException success) {} } /** - * remove removes next element, or throws NSEE if empty + * 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()); + assertEquals(i, q.remove()); } try { q.remove(); shouldThrow(); - } catch (NoSuchElementException success){ - } + } catch (NoSuchElementException success) {} } /** @@ -246,16 +262,22 @@ public class LinkedListTest extends JSR1 */ 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))); + for (int i = 1; i < SIZE; i += 2) { + assertTrue(q.contains(i)); + assertTrue(q.remove((Integer)i)); + assertFalse(q.contains(i)); + assertTrue(q.contains(i - 1)); + } + for (int i = 0; i < SIZE; i += 2) { + assertTrue(q.contains(i)); + assertTrue(q.remove((Integer)i)); + assertFalse(q.contains(i)); + assertFalse(q.remove((Integer)(i + 1))); + assertFalse(q.contains(i + 1)); } assertTrue(q.isEmpty()); } - + /** * contains(x) reports true when elements added but not yet removed */ @@ -276,7 +298,7 @@ public class LinkedListTest extends JSR1 q.clear(); assertTrue(q.isEmpty()); assertEquals(0, q.size()); - q.add(new Integer(1)); + assertTrue(q.add(new Integer(1))); assertFalse(q.isEmpty()); q.clear(); assertTrue(q.isEmpty()); @@ -291,7 +313,7 @@ public class LinkedListTest extends JSR1 for (int i = 0; i < SIZE; ++i) { assertTrue(q.containsAll(p)); assertFalse(p.containsAll(q)); - p.add(new Integer(i)); + assertTrue(p.add(new Integer(i))); } assertTrue(p.containsAll(q)); } @@ -310,7 +332,7 @@ public class LinkedListTest extends JSR1 assertTrue(changed); assertTrue(q.containsAll(p)); - assertEquals(SIZE-i, q.size()); + assertEquals(SIZE - i, q.size()); p.remove(); } } @@ -323,77 +345,85 @@ public class LinkedListTest extends JSR1 LinkedList q = populatedQueue(SIZE); LinkedList p = populatedQueue(i); assertTrue(q.removeAll(p)); - assertEquals(SIZE-i, q.size()); + assertEquals(SIZE - i, q.size()); for (int j = 0; j < i; ++j) { - Integer I = (Integer)(p.remove()); - assertFalse(q.contains(I)); + Integer x = (Integer)(p.remove()); + assertFalse(q.contains(x)); } } } /** - * toArray contains all elements + * toArray contains all elements in FIFO order */ 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()); + Object[] a = q.toArray(); + assertSame(Object[].class, a.getClass()); + for (Object o : a) + assertSame(o, q.poll()); + assertTrue(q.isEmpty()); } /** - * toArray(a) contains all elements + * toArray(a) contains all elements in FIFO order */ 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()); + LinkedList q = populatedQueue(SIZE); + Integer[] ints = new Integer[SIZE]; + Integer[] array = q.toArray(ints); + assertSame(ints, array); + for (Integer o : ints) + assertSame(o, q.poll()); + assertTrue(q.isEmpty()); } /** - * toArray(null) throws NPE + * toArray(null) throws NullPointerException */ - public void testToArray_BadArg() { - try { - LinkedList l = new LinkedList(); - l.add(new Object()); - Object o[] = l.toArray(null); - shouldThrow(); - } catch(NullPointerException success){} + public void testToArray_NullArg() { + LinkedList l = new LinkedList(); + l.add(new Object()); + try { + l.toArray(null); + shouldThrow(); + } catch (NullPointerException success) {} } /** - * toArray with incompatable aray type throws CCE + * toArray(incompatible array type) throws ArrayStoreException */ 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){} + LinkedList l = new LinkedList(); + l.add(new Integer(5)); + try { + l.toArray(new String[10]); + shouldThrow(); + } catch (ArrayStoreException success) {} } - + /** - * iterator iterates through all elements + * iterator iterates through all elements */ public void testIterator() { LinkedList q = populatedQueue(SIZE); - int i = 0; - Iterator it = q.iterator(); - while(it.hasNext()) { + Iterator it = q.iterator(); + int i; + for (i = 0; it.hasNext(); i++) assertTrue(q.contains(it.next())); - ++i; - } assertEquals(i, SIZE); + assertIteratorExhausted(it); + } + + /** + * iterator of empty collection has no elements + */ + public void testEmptyIterator() { + assertIteratorExhausted(new LinkedList().iterator()); } /** - * iterator ordering is FIFO + * iterator ordering is FIFO */ public void testIteratorOrdering() { final LinkedList q = new LinkedList(); @@ -402,8 +432,7 @@ public class LinkedListTest extends JSR1 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(++k, it.next()); } assertEquals(3, k); @@ -412,20 +441,71 @@ public class LinkedListTest extends JSR1 /** * iterator.remove removes current element */ - public void testIteratorRemove () { + 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(); + assertEquals(1, it.next()); it.remove(); it = q.iterator(); - assertEquals(it.next(), new Integer(2)); - assertEquals(it.next(), new Integer(3)); + assertEquals(2, it.next()); + assertEquals(3, it.next()); 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(); + shouldThrow(); + } 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();) { + assertEquals(++k, it.next()); + } + + assertEquals(3, k); + } + + /** + * descendingIterator.remove removes current element + */ + public void testDescendingIteratorRemove() { + final LinkedList q = new LinkedList(); + q.add(three); + q.add(two); + q.add(one); + Iterator it = q.descendingIterator(); + it.next(); + it.remove(); + it = q.descendingIterator(); + assertSame(it.next(), two); + assertSame(it.next(), three); + assertFalse(it.hasNext()); + } /** * toString contains toStrings of elements @@ -434,17 +514,155 @@ public class LinkedListTest extends JSR1 LinkedList q = populatedQueue(SIZE); String s = q.toString(); for (int i = 0; i < SIZE; ++i) { - assertTrue(s.indexOf(String.valueOf(i)) >= 0); + assertTrue(s.contains(String.valueOf(i))); } - } + } /** * peek returns element inserted with addFirst */ public void testAddFirst() { LinkedList q = populatedQueue(3); - q.addFirst(four); - assertEquals(four,q.peek()); - } + q.addFirst(four); + assertSame(four, q.peek()); + } + + /** + * peekFirst returns element inserted with push + */ + public void testPush() { + LinkedList q = populatedQueue(3); + q.push(four); + assertSame(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, q.pop()); + } + 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, q.pollLast()); + } + 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, q.peekFirst()); + assertEquals(i, q.pollFirst()); + assertTrue(q.peekFirst() == null || + !q.peekFirst().equals(i)); + } + 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, q.peekLast()); + assertEquals(i, q.pollLast()); + assertTrue(q.peekLast() == null || + !q.peekLast().equals(i)); + } + assertNull(q.peekLast()); + } + + public void testFirstElement() { + LinkedList q = populatedQueue(SIZE); + for (int i = 0; i < SIZE; ++i) { + assertEquals(i, q.getFirst()); + assertEquals(i, 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, q.getLast()); + assertEquals(i, 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()); + } }