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/* |
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* Written by Doug Lea with assistance from members of JCP JSR-166 |
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* Expert Group and released to the public domain, as explained at |
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* http://creativecommons.org/publicdomain/zero/1.0/ |
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* Other contributors include Andrew Wright, Jeffrey Hayes, |
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* Pat Fisher, Mike Judd. |
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*/ |
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|
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import java.util.Arrays; |
10 |
import java.util.Collection; |
11 |
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; |
15 |
import java.util.concurrent.ThreadLocalRandom; |
16 |
|
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import junit.framework.Test; |
18 |
|
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public class LinkedListTest extends JSR166TestCase { |
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public static void main(String[] args) { |
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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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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 JSR166TestCase.itemFor(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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@SuppressWarnings("unchecked") |
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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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* Returns a new queue of given size containing consecutive |
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* Items 0 ... n - 1. |
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*/ |
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private static LinkedList<Item> populatedQueue(int n) { |
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LinkedList<Item> 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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mustOffer(q, i); |
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assertFalse(q.isEmpty()); |
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mustEqual(n, q.size()); |
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mustEqual(0, q.peekFirst()); |
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mustEqual((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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* new queue is empty |
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*/ |
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public void testConstructor1() { |
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mustEqual(0, new LinkedList<Item>().size()); |
70 |
} |
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|
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/** |
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* Initializing from null Collection throws NPE |
74 |
*/ |
75 |
public void testConstructor3() { |
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try { |
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new LinkedList<Item>((Collection<Item>)null); |
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shouldThrow(); |
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} catch (NullPointerException success) {} |
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} |
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|
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/** |
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* Queue contains all elements of collection used to initialize |
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*/ |
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public void testConstructor6() { |
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Item[] items = defaultItems; |
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LinkedList<Item> q = new LinkedList<Item>(Arrays.asList(items)); |
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for (int i = 0; i < SIZE; ++i) |
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mustEqual(items[i], q.poll()); |
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} |
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|
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/** |
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* isEmpty is true before add, false after |
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*/ |
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public void testEmpty() { |
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LinkedList<Item> q = new LinkedList<Item>(); |
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assertTrue(q.isEmpty()); |
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q.add(one); |
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assertFalse(q.isEmpty()); |
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q.add(two); |
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q.remove(); |
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q.remove(); |
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assertTrue(q.isEmpty()); |
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} |
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|
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/** |
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* size changes when elements added and removed |
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*/ |
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public void testSize() { |
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LinkedList<Item> q = populatedQueue(SIZE); |
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for (int i = 0; i < SIZE; ++i) { |
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mustEqual(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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mustEqual(i, q.size()); |
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mustAdd(q, i); |
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} |
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} |
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|
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/** |
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* offer(null) succeeds |
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*/ |
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public void testOfferNull() { |
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LinkedList<Item> q = new LinkedList<Item>(); |
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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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* Offer succeeds |
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*/ |
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public void testOffer() { |
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LinkedList<Item> q = new LinkedList<Item>(); |
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mustOffer(q, zero); |
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mustOffer(q, one); |
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} |
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|
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/** |
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* add succeeds |
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*/ |
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public void testAdd() { |
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LinkedList<Item> q = new LinkedList<Item>(); |
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for (int i = 0; i < SIZE; ++i) { |
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mustEqual(i, q.size()); |
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mustAdd(q, i); |
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} |
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} |
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|
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/** |
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* addAll(null) throws NPE |
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*/ |
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public void testAddAll1() { |
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LinkedList<Item> q = new LinkedList<Item>(); |
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try { |
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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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|
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/** |
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* Queue contains all elements, in traversal order, of successful addAll |
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*/ |
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public void testAddAll5() { |
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Item[] empty = new Item[0]; |
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Item[] items = defaultItems; |
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LinkedList<Item> q = new LinkedList<Item>(); |
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assertFalse(q.addAll(Arrays.asList(empty))); |
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assertTrue(q.addAll(Arrays.asList(items))); |
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for (int i = 0; i < SIZE; ++i) |
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mustEqual(items[i], q.poll()); |
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} |
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|
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/** |
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* addAll with too large an index throws IOOBE |
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*/ |
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public void testAddAll2_IndexOutOfBoundsException() { |
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LinkedList<Item> l = new LinkedList<Item>(); |
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l.add(zero); |
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LinkedList<Item> m = new LinkedList<Item>(); |
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m.add(one); |
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try { |
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l.addAll(4,m); |
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shouldThrow(); |
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} catch (IndexOutOfBoundsException success) {} |
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} |
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|
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/** |
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* addAll with negative index throws IOOBE |
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*/ |
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public void testAddAll4_BadIndex() { |
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LinkedList<Item> l = new LinkedList<Item>(); |
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l.add(zero); |
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LinkedList<Item> m = new LinkedList<Item>(); |
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m.add(one); |
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try { |
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l.addAll(-1,m); |
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shouldThrow(); |
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} catch (IndexOutOfBoundsException success) {} |
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} |
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|
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/** |
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* poll succeeds unless empty |
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*/ |
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public void testPoll() { |
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LinkedList<Item> q = populatedQueue(SIZE); |
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for (int i = 0; i < SIZE; ++i) { |
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mustEqual(i, q.poll()); |
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} |
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assertNull(q.poll()); |
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} |
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|
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/** |
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* peek returns next element, or null if empty |
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*/ |
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public void testPeek() { |
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LinkedList<Item> q = populatedQueue(SIZE); |
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for (int i = 0; i < SIZE; ++i) { |
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mustEqual(i, q.peek()); |
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mustEqual(i, q.poll()); |
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assertTrue(q.peek() == null || |
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!q.peek().equals(i)); |
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} |
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assertNull(q.peek()); |
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} |
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|
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/** |
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* element returns next element, or throws NSEE if empty |
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*/ |
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public void testElement() { |
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LinkedList<Item> q = populatedQueue(SIZE); |
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for (int i = 0; i < SIZE; ++i) { |
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mustEqual(i, q.element()); |
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mustEqual(i, q.poll()); |
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} |
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try { |
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q.element(); |
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shouldThrow(); |
240 |
} catch (NoSuchElementException success) {} |
241 |
} |
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|
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/** |
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* remove removes next element, or throws NSEE if empty |
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*/ |
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public void testRemove() { |
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LinkedList<Item> q = populatedQueue(SIZE); |
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for (int i = 0; i < SIZE; ++i) { |
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mustEqual(i, q.remove()); |
250 |
} |
251 |
try { |
252 |
q.remove(); |
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shouldThrow(); |
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} catch (NoSuchElementException success) {} |
255 |
} |
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|
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/** |
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* remove(x) removes x and returns true if present |
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*/ |
260 |
public void testRemoveElement() { |
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LinkedList<Item> q = populatedQueue(SIZE); |
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for (int i = 1; i < SIZE; i += 2) { |
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mustContain(q, i); |
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mustRemove(q, i); |
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mustNotContain(q, i); |
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mustContain(q, i - 1); |
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} |
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for (int i = 0; i < SIZE; i += 2) { |
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mustContain(q, i); |
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mustRemove(q, i); |
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mustNotContain(q, i); |
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mustNotRemove(q, i + 1); |
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mustNotContain(q, i + 1); |
274 |
} |
275 |
assertTrue(q.isEmpty()); |
276 |
} |
277 |
|
278 |
/** |
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* contains(x) reports true when elements added but not yet removed |
280 |
*/ |
281 |
public void testContains() { |
282 |
LinkedList<Item> q = populatedQueue(SIZE); |
283 |
for (int i = 0; i < SIZE; ++i) { |
284 |
mustContain(q, i); |
285 |
q.poll(); |
286 |
mustNotContain(q, i); |
287 |
} |
288 |
} |
289 |
|
290 |
/** |
291 |
* clear removes all elements |
292 |
*/ |
293 |
public void testClear() { |
294 |
LinkedList<Item> q = populatedQueue(SIZE); |
295 |
q.clear(); |
296 |
assertTrue(q.isEmpty()); |
297 |
mustEqual(0, q.size()); |
298 |
mustAdd(q, one); |
299 |
assertFalse(q.isEmpty()); |
300 |
q.clear(); |
301 |
assertTrue(q.isEmpty()); |
302 |
} |
303 |
|
304 |
/** |
305 |
* containsAll(c) is true when c contains a subset of elements |
306 |
*/ |
307 |
public void testContainsAll() { |
308 |
LinkedList<Item> q = populatedQueue(SIZE); |
309 |
LinkedList<Item> p = new LinkedList<Item>(); |
310 |
for (int i = 0; i < SIZE; ++i) { |
311 |
assertTrue(q.containsAll(p)); |
312 |
assertFalse(p.containsAll(q)); |
313 |
mustAdd(p, i); |
314 |
} |
315 |
assertTrue(p.containsAll(q)); |
316 |
} |
317 |
|
318 |
/** |
319 |
* retainAll(c) retains only those elements of c and reports true if changed |
320 |
*/ |
321 |
public void testRetainAll() { |
322 |
LinkedList<Item> q = populatedQueue(SIZE); |
323 |
LinkedList<Item> p = populatedQueue(SIZE); |
324 |
for (int i = 0; i < SIZE; ++i) { |
325 |
boolean changed = q.retainAll(p); |
326 |
if (i == 0) |
327 |
assertFalse(changed); |
328 |
else |
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assertTrue(changed); |
330 |
|
331 |
assertTrue(q.containsAll(p)); |
332 |
mustEqual(SIZE - i, q.size()); |
333 |
p.remove(); |
334 |
} |
335 |
} |
336 |
|
337 |
/** |
338 |
* removeAll(c) removes only those elements of c and reports true if changed |
339 |
*/ |
340 |
public void testRemoveAll() { |
341 |
for (int i = 1; i < SIZE; ++i) { |
342 |
LinkedList<Item> q = populatedQueue(SIZE); |
343 |
LinkedList<Item> p = populatedQueue(i); |
344 |
assertTrue(q.removeAll(p)); |
345 |
mustEqual(SIZE - i, q.size()); |
346 |
for (int j = 0; j < i; ++j) { |
347 |
mustNotContain(q, p.remove()); |
348 |
} |
349 |
} |
350 |
} |
351 |
|
352 |
/** |
353 |
* toArray contains all elements in FIFO order |
354 |
*/ |
355 |
public void testToArray() { |
356 |
LinkedList<Item> q = populatedQueue(SIZE); |
357 |
Object[] a = q.toArray(); |
358 |
assertSame(Object[].class, a.getClass()); |
359 |
for (Object o : a) |
360 |
assertSame(o, q.poll()); |
361 |
assertTrue(q.isEmpty()); |
362 |
} |
363 |
|
364 |
/** |
365 |
* toArray(a) contains all elements in FIFO order |
366 |
*/ |
367 |
public void testToArray2() { |
368 |
LinkedList<Item> q = populatedQueue(SIZE); |
369 |
Item[] items = new Item[SIZE]; |
370 |
Item[] array = q.toArray(items); |
371 |
assertSame(items, array); |
372 |
for (Item o : items) |
373 |
assertSame(o, q.poll()); |
374 |
assertTrue(q.isEmpty()); |
375 |
} |
376 |
|
377 |
/** |
378 |
* toArray(null) throws NullPointerException |
379 |
*/ |
380 |
public void testToArray_NullArg() { |
381 |
LinkedList<Item> l = new LinkedList<Item>(); |
382 |
l.add(zero); |
383 |
try { |
384 |
l.toArray((Item[])null); |
385 |
shouldThrow(); |
386 |
} catch (NullPointerException success) {} |
387 |
} |
388 |
|
389 |
/** |
390 |
* toArray(incompatible array type) throws ArrayStoreException |
391 |
*/ |
392 |
public void testToArray1_BadArg() { |
393 |
LinkedList<Item> l = new LinkedList<Item>(); |
394 |
l.add(five); |
395 |
try { |
396 |
l.toArray(new String[10]); |
397 |
shouldThrow(); |
398 |
} catch (ArrayStoreException success) {} |
399 |
} |
400 |
|
401 |
/** |
402 |
* iterator iterates through all elements |
403 |
*/ |
404 |
public void testIterator() { |
405 |
LinkedList<Item> q = populatedQueue(SIZE); |
406 |
Iterator<? extends Item> it = q.iterator(); |
407 |
int i; |
408 |
for (i = 0; it.hasNext(); i++) |
409 |
mustContain(q, it.next()); |
410 |
mustEqual(i, SIZE); |
411 |
assertIteratorExhausted(it); |
412 |
} |
413 |
|
414 |
/** |
415 |
* iterator of empty collection has no elements |
416 |
*/ |
417 |
public void testEmptyIterator() { |
418 |
assertIteratorExhausted(new LinkedList<Item>().iterator()); |
419 |
} |
420 |
|
421 |
/** |
422 |
* iterator ordering is FIFO |
423 |
*/ |
424 |
public void testIteratorOrdering() { |
425 |
final LinkedList<Item> q = new LinkedList<Item>(); |
426 |
q.add(one); |
427 |
q.add(two); |
428 |
q.add(three); |
429 |
int k = 0; |
430 |
for (Iterator<? extends Item> it = q.iterator(); it.hasNext();) { |
431 |
mustEqual(++k, it.next()); |
432 |
} |
433 |
|
434 |
mustEqual(3, k); |
435 |
} |
436 |
|
437 |
/** |
438 |
* iterator.remove removes current element |
439 |
*/ |
440 |
public void testIteratorRemove() { |
441 |
final LinkedList<Item> q = new LinkedList<Item>(); |
442 |
q.add(one); |
443 |
q.add(two); |
444 |
q.add(three); |
445 |
Iterator<? extends Item> it = q.iterator(); |
446 |
mustEqual(1, it.next()); |
447 |
it.remove(); |
448 |
it = q.iterator(); |
449 |
mustEqual(2, it.next()); |
450 |
mustEqual(3, it.next()); |
451 |
assertFalse(it.hasNext()); |
452 |
} |
453 |
|
454 |
/** |
455 |
* Descending iterator iterates through all elements |
456 |
*/ |
457 |
public void testDescendingIterator() { |
458 |
LinkedList<Item> q = populatedQueue(SIZE); |
459 |
int i = 0; |
460 |
Iterator<? extends Item> it = q.descendingIterator(); |
461 |
while (it.hasNext()) { |
462 |
mustContain(q, it.next()); |
463 |
++i; |
464 |
} |
465 |
mustEqual(i, SIZE); |
466 |
assertFalse(it.hasNext()); |
467 |
try { |
468 |
it.next(); |
469 |
shouldThrow(); |
470 |
} catch (NoSuchElementException success) {} |
471 |
} |
472 |
|
473 |
/** |
474 |
* Descending iterator ordering is reverse FIFO |
475 |
*/ |
476 |
public void testDescendingIteratorOrdering() { |
477 |
final LinkedList<Item> q = new LinkedList<Item>(); |
478 |
q.add(three); |
479 |
q.add(two); |
480 |
q.add(one); |
481 |
int k = 0; |
482 |
for (Iterator<? extends Item> it = q.descendingIterator(); it.hasNext();) { |
483 |
mustEqual(++k, it.next()); |
484 |
} |
485 |
|
486 |
mustEqual(3, k); |
487 |
} |
488 |
|
489 |
/** |
490 |
* descendingIterator.remove removes current element |
491 |
*/ |
492 |
public void testDescendingIteratorRemove() { |
493 |
final LinkedList<Item> q = new LinkedList<Item>(); |
494 |
q.add(three); |
495 |
q.add(two); |
496 |
q.add(one); |
497 |
Iterator<? extends Item> it = q.descendingIterator(); |
498 |
it.next(); |
499 |
it.remove(); |
500 |
it = q.descendingIterator(); |
501 |
assertSame(it.next(), two); |
502 |
assertSame(it.next(), three); |
503 |
assertFalse(it.hasNext()); |
504 |
} |
505 |
|
506 |
/** |
507 |
* toString contains toStrings of elements |
508 |
*/ |
509 |
public void testToString() { |
510 |
LinkedList<Item> q = populatedQueue(SIZE); |
511 |
String s = q.toString(); |
512 |
for (int i = 0; i < SIZE; ++i) { |
513 |
assertTrue(s.contains(String.valueOf(i))); |
514 |
} |
515 |
} |
516 |
|
517 |
/** |
518 |
* peek returns element inserted with addFirst |
519 |
*/ |
520 |
public void testAddFirst() { |
521 |
LinkedList<Item> q = populatedQueue(3); |
522 |
q.addFirst(four); |
523 |
assertSame(four, q.peek()); |
524 |
} |
525 |
|
526 |
/** |
527 |
* peekFirst returns element inserted with push |
528 |
*/ |
529 |
public void testPush() { |
530 |
LinkedList<Item> q = populatedQueue(3); |
531 |
q.push(four); |
532 |
assertSame(four, q.peekFirst()); |
533 |
} |
534 |
|
535 |
/** |
536 |
* pop removes next element, or throws NSEE if empty |
537 |
*/ |
538 |
public void testPop() { |
539 |
LinkedList<Item> q = populatedQueue(SIZE); |
540 |
for (int i = 0; i < SIZE; ++i) { |
541 |
mustEqual(i, q.pop()); |
542 |
} |
543 |
try { |
544 |
q.pop(); |
545 |
shouldThrow(); |
546 |
} catch (NoSuchElementException success) {} |
547 |
} |
548 |
|
549 |
/** |
550 |
* OfferFirst succeeds |
551 |
*/ |
552 |
public void testOfferFirst() { |
553 |
LinkedList<Item> q = new LinkedList<Item>(); |
554 |
assertTrue(q.offerFirst(zero)); |
555 |
assertTrue(q.offerFirst(one)); |
556 |
} |
557 |
|
558 |
/** |
559 |
* OfferLast succeeds |
560 |
*/ |
561 |
public void testOfferLast() { |
562 |
LinkedList<Item> q = new LinkedList<Item>(); |
563 |
assertTrue(q.offerLast(zero)); |
564 |
assertTrue(q.offerLast(one)); |
565 |
} |
566 |
|
567 |
/** |
568 |
* pollLast succeeds unless empty |
569 |
*/ |
570 |
public void testPollLast() { |
571 |
LinkedList<Item> q = populatedQueue(SIZE); |
572 |
for (int i = SIZE - 1; i >= 0; --i) { |
573 |
mustEqual(i, q.pollLast()); |
574 |
} |
575 |
assertNull(q.pollLast()); |
576 |
} |
577 |
|
578 |
/** |
579 |
* peekFirst returns next element, or null if empty |
580 |
*/ |
581 |
public void testPeekFirst() { |
582 |
LinkedList<Item> q = populatedQueue(SIZE); |
583 |
for (int i = 0; i < SIZE; ++i) { |
584 |
mustEqual(i, q.peekFirst()); |
585 |
mustEqual(i, q.pollFirst()); |
586 |
assertTrue(q.peekFirst() == null || |
587 |
!q.peekFirst().equals(i)); |
588 |
} |
589 |
assertNull(q.peekFirst()); |
590 |
} |
591 |
|
592 |
/** |
593 |
* peekLast returns next element, or null if empty |
594 |
*/ |
595 |
public void testPeekLast() { |
596 |
LinkedList<Item> q = populatedQueue(SIZE); |
597 |
for (int i = SIZE - 1; i >= 0; --i) { |
598 |
mustEqual(i, q.peekLast()); |
599 |
mustEqual(i, q.pollLast()); |
600 |
assertTrue(q.peekLast() == null || |
601 |
!q.peekLast().equals(i)); |
602 |
} |
603 |
assertNull(q.peekLast()); |
604 |
} |
605 |
|
606 |
public void testFirstElement() { |
607 |
LinkedList<Item> q = populatedQueue(SIZE); |
608 |
for (int i = 0; i < SIZE; ++i) { |
609 |
mustEqual(i, q.getFirst()); |
610 |
mustEqual(i, q.pollFirst()); |
611 |
} |
612 |
try { |
613 |
q.getFirst(); |
614 |
shouldThrow(); |
615 |
} catch (NoSuchElementException success) {} |
616 |
} |
617 |
|
618 |
/** |
619 |
* getLast returns next element, or throws NSEE if empty |
620 |
*/ |
621 |
public void testLastElement() { |
622 |
LinkedList<Item> q = populatedQueue(SIZE); |
623 |
for (int i = SIZE - 1; i >= 0; --i) { |
624 |
mustEqual(i, q.getLast()); |
625 |
mustEqual(i, q.pollLast()); |
626 |
} |
627 |
try { |
628 |
q.getLast(); |
629 |
shouldThrow(); |
630 |
} catch (NoSuchElementException success) {} |
631 |
assertNull(q.peekLast()); |
632 |
} |
633 |
|
634 |
/** |
635 |
* removeFirstOccurrence(x) removes x and returns true if present |
636 |
*/ |
637 |
public void testRemoveFirstOccurrence() { |
638 |
LinkedList<Item> q = populatedQueue(SIZE); |
639 |
for (int i = 1; i < SIZE; i += 2) { |
640 |
assertTrue(q.removeFirstOccurrence(itemFor(i))); |
641 |
} |
642 |
for (int i = 0; i < SIZE; i += 2) { |
643 |
assertTrue(q.removeFirstOccurrence(itemFor(i))); |
644 |
assertFalse(q.removeFirstOccurrence(itemFor(i + 1))); |
645 |
} |
646 |
assertTrue(q.isEmpty()); |
647 |
} |
648 |
|
649 |
/** |
650 |
* removeLastOccurrence(x) removes x and returns true if present |
651 |
*/ |
652 |
public void testRemoveLastOccurrence() { |
653 |
LinkedList<Item> q = populatedQueue(SIZE); |
654 |
for (int i = 1; i < SIZE; i += 2) { |
655 |
assertTrue(q.removeLastOccurrence(itemFor(i))); |
656 |
} |
657 |
for (int i = 0; i < SIZE; i += 2) { |
658 |
assertTrue(q.removeLastOccurrence(itemFor(i))); |
659 |
assertFalse(q.removeLastOccurrence(itemFor(i + 1))); |
660 |
} |
661 |
assertTrue(q.isEmpty()); |
662 |
} |
663 |
|
664 |
} |