/*
* 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 DelayQueueTest extends JSR166TestCase {
public static void main(String[] args) {
junit.textui.TestRunner.run (suite());
}
public static Test suite() {
return new TestSuite(DelayQueueTest.class);
}
private static final int NOCAP = Integer.MAX_VALUE;
/**
* A delayed implementation for testing.
* Most tests use Pseudodelays, where delays are all elapsed
* (so, no blocking solely for delays) but are still ordered
*/
static class PDelay implements Delayed {
int pseudodelay;
PDelay(int i) { pseudodelay = Integer.MIN_VALUE + i; }
public int compareTo(PDelay y) {
int i = pseudodelay;
int j = ((PDelay)y).pseudodelay;
if (i < j) return -1;
if (i > j) return 1;
return 0;
}
public int compareTo(Delayed y) {
int i = pseudodelay;
int j = ((PDelay)y).pseudodelay;
if (i < j) return -1;
if (i > j) return 1;
return 0;
}
public boolean equals(Object other) {
return ((PDelay)other).pseudodelay == pseudodelay;
}
public boolean equals(PDelay other) {
return ((PDelay)other).pseudodelay == pseudodelay;
}
public long getDelay(TimeUnit ignore) {
return pseudodelay;
}
public int intValue() {
return pseudodelay;
}
public String toString() {
return String.valueOf(pseudodelay);
}
}
/**
* Delayed implementation that actually delays
*/
static class NanoDelay implements Delayed {
long trigger;
NanoDelay(long i) {
trigger = System.nanoTime() + i;
}
public int compareTo(NanoDelay y) {
long i = trigger;
long j = ((NanoDelay)y).trigger;
if (i < j) return -1;
if (i > j) return 1;
return 0;
}
public int compareTo(Delayed y) {
long i = trigger;
long j = ((NanoDelay)y).trigger;
if (i < j) return -1;
if (i > j) return 1;
return 0;
}
public boolean equals(Object other) {
return ((NanoDelay)other).trigger == trigger;
}
public boolean equals(NanoDelay other) {
return ((NanoDelay)other).trigger == trigger;
}
public long getDelay(TimeUnit unit) {
long n = trigger - System.nanoTime();
return unit.convert(n, TimeUnit.NANOSECONDS);
}
public long getTriggerTime() {
return trigger;
}
public String toString() {
return String.valueOf(trigger);
}
}
/**
* Create a queue of given size containing consecutive
* PDelays 0 ... n.
*/
private DelayQueue populatedQueue(int n) {
DelayQueue q = new DelayQueue();
assertTrue(q.isEmpty());
for(int i = n-1; i >= 0; i-=2)
assertTrue(q.offer(new PDelay(i)));
for(int i = (n & 1); i < n; i+=2)
assertTrue(q.offer(new PDelay(i)));
assertFalse(q.isEmpty());
assertEquals(NOCAP, q.remainingCapacity());
assertEquals(n, q.size());
return q;
}
/**
* A new queue has unbounded capacity
*/
public void testConstructor1() {
assertEquals(NOCAP, new DelayQueue().remainingCapacity());
}
/**
* Initializing from null Collection throws NPE
*/
public void testConstructor3() {
try {
DelayQueue q = new DelayQueue(null);
shouldThrow();
}
catch (NullPointerException success) {}
}
/**
* Initializing from Collection of null elements throws NPE
*/
public void testConstructor4() {
try {
PDelay[] ints = new PDelay[SIZE];
DelayQueue q = new DelayQueue(Arrays.asList(ints));
shouldThrow();
}
catch (NullPointerException success) {}
}
/**
* Initializing from Collection with some null elements throws NPE
*/
public void testConstructor5() {
try {
PDelay[] ints = new PDelay[SIZE];
for (int i = 0; i < SIZE-1; ++i)
ints[i] = new PDelay(i);
DelayQueue q = new DelayQueue(Arrays.asList(ints));
shouldThrow();
}
catch (NullPointerException success) {}
}
/**
* Queue contains all elements of collection used to initialize
*/
public void testConstructor6() {
try {
PDelay[] ints = new PDelay[SIZE];
for (int i = 0; i < SIZE; ++i)
ints[i] = new PDelay(i);
DelayQueue q = new DelayQueue(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() {
DelayQueue q = new DelayQueue();
assertTrue(q.isEmpty());
assertEquals(NOCAP, q.remainingCapacity());
q.add(new PDelay(1));
assertFalse(q.isEmpty());
q.add(new PDelay(2));
q.remove();
q.remove();
assertTrue(q.isEmpty());
}
/**
* remainingCapacity does not change when elementa added or removed,
* but size does
*/
public void testRemainingCapacity() {
DelayQueue q = populatedQueue(SIZE);
for (int i = 0; i < SIZE; ++i) {
assertEquals(NOCAP, q.remainingCapacity());
assertEquals(SIZE-i, q.size());
q.remove();
}
for (int i = 0; i < SIZE; ++i) {
assertEquals(NOCAP, q.remainingCapacity());
assertEquals(i, q.size());
q.add(new PDelay(i));
}
}
/**
* offer(null) throws NPE
*/
public void testOfferNull() {
try {
DelayQueue q = new DelayQueue();
q.offer(null);
shouldThrow();
} catch (NullPointerException success) { }
}
/**
* add(null) throws NPE
*/
public void testAddNull() {
try {
DelayQueue q = new DelayQueue();
q.add(null);
shouldThrow();
} catch (NullPointerException success) { }
}
/**
* offer non-null succeeds
*/
public void testOffer() {
DelayQueue q = new DelayQueue();
assertTrue(q.offer(new PDelay(0)));
assertTrue(q.offer(new PDelay(1)));
}
/**
* add succeeds
*/
public void testAdd() {
DelayQueue q = new DelayQueue();
for (int i = 0; i < SIZE; ++i) {
assertEquals(i, q.size());
assertTrue(q.add(new PDelay(i)));
}
}
/**
* addAll(null) throws NPE
*/
public void testAddAll1() {
try {
DelayQueue q = new DelayQueue();
q.addAll(null);
shouldThrow();
}
catch (NullPointerException success) {}
}
/**
* addAll(this) throws IAE
*/
public void testAddAllSelf() {
try {
DelayQueue q = populatedQueue(SIZE);
q.addAll(q);
shouldThrow();
}
catch (IllegalArgumentException success) {}
}
/**
* addAll of a collection with null elements throws NPE
*/
public void testAddAll2() {
try {
DelayQueue q = new DelayQueue();
PDelay[] ints = new PDelay[SIZE];
q.addAll(Arrays.asList(ints));
shouldThrow();
}
catch (NullPointerException success) {}
}
/**
* addAll of a collection with any null elements throws NPE after
* possibly adding some elements
*/
public void testAddAll3() {
try {
DelayQueue q = new DelayQueue();
PDelay[] ints = new PDelay[SIZE];
for (int i = 0; i < SIZE-1; ++i)
ints[i] = new PDelay(i);
q.addAll(Arrays.asList(ints));
shouldThrow();
}
catch (NullPointerException success) {}
}
/**
* Queue contains all elements of successful addAll
*/
public void testAddAll5() {
try {
PDelay[] empty = new PDelay[0];
PDelay[] ints = new PDelay[SIZE];
for (int i = SIZE-1; i >= 0; --i)
ints[i] = new PDelay(i);
DelayQueue q = new DelayQueue();
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 {}
}
/**
* put(null) throws NPE
*/
public void testPutNull() {
try {
DelayQueue q = new DelayQueue();
q.put(null);
shouldThrow();
}
catch (NullPointerException success){
}
}
/**
* all elements successfully put are contained
*/
public void testPut() {
try {
DelayQueue q = new DelayQueue();
for (int i = 0; i < SIZE; ++i) {
PDelay I = new PDelay(i);
q.put(I);
assertTrue(q.contains(I));
}
assertEquals(SIZE, q.size());
}
finally {
}
}
/**
* put doesn't block waiting for take
*/
public void testPutWithTake() {
final DelayQueue q = new DelayQueue();
Thread t = new Thread(new Runnable() {
public void run() {
int added = 0;
try {
q.put(new PDelay(0));
++added;
q.put(new PDelay(0));
++added;
q.put(new PDelay(0));
++added;
q.put(new PDelay(0));
++added;
threadAssertTrue(added == 4);
} finally {
}
}
});
try {
t.start();
Thread.sleep(SHORT_DELAY_MS);
q.take();
t.interrupt();
t.join();
} catch (Exception e){
unexpectedException();
}
}
/**
* timed offer does not time out
*/
public void testTimedOffer() {
final DelayQueue q = new DelayQueue();
Thread t = new Thread(new Runnable() {
public void run() {
try {
q.put(new PDelay(0));
q.put(new PDelay(0));
threadAssertTrue(q.offer(new PDelay(0), SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
threadAssertTrue(q.offer(new PDelay(0), LONG_DELAY_MS, TimeUnit.MILLISECONDS));
} finally { }
}
});
try {
t.start();
Thread.sleep(SMALL_DELAY_MS);
t.interrupt();
t.join();
} catch (Exception e){
unexpectedException();
}
}
/**
* take retrieves elements in priority order
*/
public void testTake() {
try {
DelayQueue q = populatedQueue(SIZE);
for (int i = 0; i < SIZE; ++i) {
assertEquals(new PDelay(i), ((PDelay)q.take()));
}
} catch (InterruptedException e){
unexpectedException();
}
}
/**
* take blocks interruptibly when empty
*/
public void testTakeFromEmpty() {
final DelayQueue q = new DelayQueue();
Thread t = new Thread(new Runnable() {
public void run() {
try {
q.take();
threadShouldThrow();
} catch (InterruptedException success){ }
}
});
try {
t.start();
Thread.sleep(SHORT_DELAY_MS);
t.interrupt();
t.join();
} catch (Exception e){
unexpectedException();
}
}
/**
* Take removes existing elements until empty, then blocks interruptibly
*/
public void testBlockingTake() {
Thread t = new Thread(new Runnable() {
public void run() {
try {
DelayQueue q = populatedQueue(SIZE);
for (int i = 0; i < SIZE; ++i) {
threadAssertEquals(new PDelay(i), ((PDelay)q.take()));
}
q.take();
threadShouldThrow();
} catch (InterruptedException success){
}
}});
t.start();
try {
Thread.sleep(SHORT_DELAY_MS);
t.interrupt();
t.join();
}
catch (InterruptedException ie) {
unexpectedException();
}
}
/**
* poll succeeds unless empty
*/
public void testPoll() {
DelayQueue q = populatedQueue(SIZE);
for (int i = 0; i < SIZE; ++i) {
assertEquals(new PDelay(i), ((PDelay)q.poll()));
}
assertNull(q.poll());
}
/**
* timed pool with zero timeout succeeds when non-empty, else times out
*/
public void testTimedPoll0() {
try {
DelayQueue q = populatedQueue(SIZE);
for (int i = 0; i < SIZE; ++i) {
assertEquals(new PDelay(i), ((PDelay)q.poll(0, TimeUnit.MILLISECONDS)));
}
assertNull(q.poll(0, TimeUnit.MILLISECONDS));
} catch (InterruptedException e){
unexpectedException();
}
}
/**
* timed pool with nonzero timeout succeeds when non-empty, else times out
*/
public void testTimedPoll() {
try {
DelayQueue q = populatedQueue(SIZE);
for (int i = 0; i < SIZE; ++i) {
assertEquals(new PDelay(i), ((PDelay)q.poll(SHORT_DELAY_MS, TimeUnit.MILLISECONDS)));
}
assertNull(q.poll(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
} catch (InterruptedException e){
unexpectedException();
}
}
/**
* Interrupted timed poll throws InterruptedException instead of
* returning timeout status
*/
public void testInterruptedTimedPoll() {
Thread t = new Thread(new Runnable() {
public void run() {
try {
DelayQueue q = populatedQueue(SIZE);
for (int i = 0; i < SIZE; ++i) {
threadAssertEquals(new PDelay(i), ((PDelay)q.poll(SHORT_DELAY_MS, TimeUnit.MILLISECONDS)));
}
threadAssertNull(q.poll(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
} catch (InterruptedException success){
}
}});
t.start();
try {
Thread.sleep(SHORT_DELAY_MS);
t.interrupt();
t.join();
}
catch (InterruptedException ie) {
unexpectedException();
}
}
/**
* timed poll before a delayed offer fails; after offer succeeds;
* on interruption throws
*/
public void testTimedPollWithOffer() {
final DelayQueue q = new DelayQueue();
Thread t = new Thread(new Runnable() {
public void run() {
try {
threadAssertNull(q.poll(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
q.poll(LONG_DELAY_MS, TimeUnit.MILLISECONDS);
q.poll(LONG_DELAY_MS, TimeUnit.MILLISECONDS);
threadFail("Should block");
} catch (InterruptedException success) { }
}
});
try {
t.start();
Thread.sleep(SMALL_DELAY_MS);
assertTrue(q.offer(new PDelay(0), SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
t.interrupt();
t.join();
} catch (Exception e){
unexpectedException();
}
}
/**
* peek returns next element, or null if empty
*/
public void testPeek() {
DelayQueue q = populatedQueue(SIZE);
for (int i = 0; i < SIZE; ++i) {
assertEquals(new PDelay(i), ((PDelay)q.peek()));
q.poll();
if (q.isEmpty())
assertNull(q.peek());
else
assertTrue(i != ((PDelay)q.peek()).intValue());
}
assertNull(q.peek());
}
/**
* element returns next element, or throws NSEE if empty
*/
public void testElement() {
DelayQueue q = populatedQueue(SIZE);
for (int i = 0; i < SIZE; ++i) {
assertEquals(new PDelay(i), ((PDelay)q.element()));
q.poll();
}
try {
q.element();
shouldThrow();
}
catch (NoSuchElementException success) {}
}
/**
* remove removes next element, or throws NSEE if empty
*/
public void testRemove() {
DelayQueue q = populatedQueue(SIZE);
for (int i = 0; i < SIZE; ++i) {
assertEquals(new PDelay(i), ((PDelay)q.remove()));
}
try {
q.remove();
shouldThrow();
} catch (NoSuchElementException success){
}
}
/**
* remove(x) removes x and returns true if present
*/
public void testRemoveElement() {
DelayQueue q = populatedQueue(SIZE);
for (int i = 1; i < SIZE; i+=2) {
assertTrue(q.remove(new PDelay(i)));
}
for (int i = 0; i < SIZE; i+=2) {
assertTrue(q.remove(new PDelay(i)));
assertFalse(q.remove(new PDelay(i+1)));
}
assertTrue(q.isEmpty());
}
/**
* contains(x) reports true when elements added but not yet removed
*/
public void testContains() {
DelayQueue q = populatedQueue(SIZE);
for (int i = 0; i < SIZE; ++i) {
assertTrue(q.contains(new PDelay(i)));
q.poll();
assertFalse(q.contains(new PDelay(i)));
}
}
/**
* clear removes all elements
*/
public void testClear() {
DelayQueue q = populatedQueue(SIZE);
q.clear();
assertTrue(q.isEmpty());
assertEquals(0, q.size());
assertEquals(NOCAP, q.remainingCapacity());
PDelay x = new PDelay(1);
q.add(x);
assertFalse(q.isEmpty());
assertTrue(q.contains(x));
q.clear();
assertTrue(q.isEmpty());
}
/**
* containsAll(c) is true when c contains a subset of elements
*/
public void testContainsAll() {
DelayQueue q = populatedQueue(SIZE);
DelayQueue p = new DelayQueue();
for (int i = 0; i < SIZE; ++i) {
assertTrue(q.containsAll(p));
assertFalse(p.containsAll(q));
p.add(new PDelay(i));
}
assertTrue(p.containsAll(q));
}
/**
* retainAll(c) retains only those elements of c and reports true if changed
*/
public void testRetainAll() {
DelayQueue q = populatedQueue(SIZE);
DelayQueue 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) {
DelayQueue q = populatedQueue(SIZE);
DelayQueue p = populatedQueue(i);
assertTrue(q.removeAll(p));
assertEquals(SIZE-i, q.size());
for (int j = 0; j < i; ++j) {
PDelay I = (PDelay)(p.remove());
assertFalse(q.contains(I));
}
}
}
/**
* toArray contains all elements
*/
public void testToArray() {
DelayQueue q = populatedQueue(SIZE);
Object[] o = q.toArray();
Arrays.sort(o);
try {
for(int i = 0; i < o.length; i++)
assertEquals(o[i], q.take());
} catch (InterruptedException e){
unexpectedException();
}
}
/**
* toArray(a) contains all elements
*/
public void testToArray2() {
DelayQueue q = populatedQueue(SIZE);
PDelay[] ints = new PDelay[SIZE];
ints = (PDelay[])q.toArray(ints);
Arrays.sort(ints);
try {
for(int i = 0; i < ints.length; i++)
assertEquals(ints[i], q.take());
} catch (InterruptedException e){
unexpectedException();
}
}
/**
* toArray(null) throws NPE
*/
public void testToArray_BadArg() {
try {
DelayQueue q = populatedQueue(SIZE);
Object o[] = q.toArray(null);
shouldThrow();
} catch(NullPointerException success){}
}
/**
* toArray with incompatible array type throws CCE
*/
public void testToArray1_BadArg() {
try {
DelayQueue q = populatedQueue(SIZE);
Object o[] = q.toArray(new String[10] );
shouldThrow();
} catch(ArrayStoreException success){}
}
/**
* iterator iterates through all elements
*/
public void testIterator() {
DelayQueue q = populatedQueue(SIZE);
int i = 0;
Iterator it = q.iterator();
while(it.hasNext()) {
assertTrue(q.contains(it.next()));
++i;
}
assertEquals(i, SIZE);
}
/**
* iterator.remove removes current element
*/
public void testIteratorRemove () {
final DelayQueue q = new DelayQueue();
q.add(new PDelay(2));
q.add(new PDelay(1));
q.add(new PDelay(3));
Iterator it = q.iterator();
it.next();
it.remove();
it = q.iterator();
assertEquals(it.next(), new PDelay(2));
assertEquals(it.next(), new PDelay(3));
assertFalse(it.hasNext());
}
/**
* toString contains toStrings of elements
*/
public void testToString() {
DelayQueue q = populatedQueue(SIZE);
String s = q.toString();
for (int i = 0; i < SIZE; ++i) {
assertTrue(s.indexOf(String.valueOf(Integer.MIN_VALUE+i)) >= 0);
}
}
/**
* offer transfers elements across Executor tasks
*/
public void testPollInExecutor() {
final DelayQueue q = new DelayQueue();
ExecutorService executor = Executors.newFixedThreadPool(2);
executor.execute(new Runnable() {
public void run() {
threadAssertNull(q.poll());
try {
threadAssertTrue(null != q.poll(MEDIUM_DELAY_MS, TimeUnit.MILLISECONDS));
threadAssertTrue(q.isEmpty());
}
catch (InterruptedException e) {
threadUnexpectedException();
}
}
});
executor.execute(new Runnable() {
public void run() {
try {
Thread.sleep(SHORT_DELAY_MS);
q.put(new PDelay(1));
}
catch (InterruptedException e) {
threadUnexpectedException();
}
}
});
joinPool(executor);
}
/**
* Delayed actions do not occur until their delay elapses
*/
public void testDelay() {
DelayQueue q = new DelayQueue();
NanoDelay[] elements = new NanoDelay[SIZE];
for (int i = 0; i < SIZE; ++i) {
elements[i] = new NanoDelay(1000000000L + 1000000L * (SIZE - i));
}
for (int i = 0; i < SIZE; ++i) {
q.add(elements[i]);
}
try {
long last = 0;
for (int i = 0; i < SIZE; ++i) {
NanoDelay e = (NanoDelay)(q.take());
long tt = e.getTriggerTime();
assertTrue(tt <= System.nanoTime());
if (i != 0)
assertTrue(tt >= last);
last = tt;
}
}
catch(InterruptedException ie) {
unexpectedException();
}
}
/**
* peek of a non-empty queue returns non-null even if not expired
*/
public void testPeekDelayed() {
DelayQueue q = new DelayQueue();
q.add(new NanoDelay(Long.MAX_VALUE));
assert(q.peek() != null);
}
/**
* poll of a non-empty queue returns null if no expired elements.
*/
public void testPollDelayed() {
DelayQueue q = new DelayQueue();
q.add(new NanoDelay(Long.MAX_VALUE));
assertNull(q.poll());
}
/**
* timed poll of a non-empty queue returns null if no expired elements.
*/
public void testTimedPollDelayed() {
DelayQueue q = new DelayQueue();
q.add(new NanoDelay(LONG_DELAY_MS * 1000000L));
try {
assertNull(q.poll(SHORT_DELAY_MS, TimeUnit.MILLISECONDS));
} catch (Exception ex) {
unexpectedException();
}
}
/**
* drainTo(null) throws NPE
*/
public void testDrainToNull() {
DelayQueue q = populatedQueue(SIZE);
try {
q.drainTo(null);
shouldThrow();
} catch(NullPointerException success) {
}
}
/**
* drainTo(this) throws IAE
*/
public void testDrainToSelf() {
DelayQueue q = populatedQueue(SIZE);
try {
q.drainTo(q);
shouldThrow();
} catch(IllegalArgumentException success) {
}
}
/**
* drainTo(c) empties queue into another collection c
*/
public void testDrainTo() {
DelayQueue q = new DelayQueue();
PDelay[] elems = new PDelay[SIZE];
for (int i = 0; i < SIZE; ++i) {
elems[i] = new PDelay(i);
q.add(elems[i]);
}
ArrayList l = new ArrayList();
q.drainTo(l);
assertEquals(q.size(), 0);
for (int i = 0; i < SIZE; ++i)
assertEquals(l.get(i), elems[i]);
q.add(elems[0]);
q.add(elems[1]);
assertFalse(q.isEmpty());
assertTrue(q.contains(elems[0]));
assertTrue(q.contains(elems[1]));
l.clear();
q.drainTo(l);
assertEquals(q.size(), 0);
assertEquals(l.size(), 2);
for (int i = 0; i < 2; ++i)
assertEquals(l.get(i), elems[i]);
}
/**
* drainTo empties queue
*/
public void testDrainToWithActivePut() {
final DelayQueue q = populatedQueue(SIZE);
Thread t = new Thread(new Runnable() {
public void run() {
q.put(new PDelay(SIZE+1));
}
});
try {
t.start();
ArrayList l = new ArrayList();
q.drainTo(l);
assertTrue(l.size() >= SIZE);
t.join();
assertTrue(q.size() + l.size() >= SIZE);
} catch(Exception e){
unexpectedException();
}
}
/**
* drainTo(null, n) throws NPE
*/
public void testDrainToNullN() {
DelayQueue q = populatedQueue(SIZE);
try {
q.drainTo(null, 0);
shouldThrow();
} catch(NullPointerException success) {
}
}
/**
* drainTo(this, n) throws IAE
*/
public void testDrainToSelfN() {
DelayQueue q = populatedQueue(SIZE);
try {
q.drainTo(q, 0);
shouldThrow();
} catch(IllegalArgumentException success) {
}
}
/**
* drainTo(c, n) empties first max {n, size} elements of queue into c
*/
public void testDrainToN() {
for (int i = 0; i < SIZE + 2; ++i) {
DelayQueue q = populatedQueue(SIZE);
ArrayList l = new ArrayList();
q.drainTo(l, i);
int k = (i < SIZE)? i : SIZE;
assertEquals(q.size(), SIZE-k);
assertEquals(l.size(), k);
}
}
}