/** Returns a new queue of given size containing consecutive PDelays 0 ... n. */
private DelayQueue<PDelay> populatedQueue(int n) {
DelayQueue<PDelay> q = new DelayQueue<PDelay>();
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(Integer.MAX_VALUE, q.remainingCapacity());
assertEquals(n, q.size());
return q;
}
/** isEmpty is true before add, false after */
public void testEmpty() {
DelayQueue q = new DelayQueue();
assertTrue(q.isEmpty());
assertEquals(Integer.MAX_VALUE, q.remainingCapacity());
q.add(new PDelay(1));
assertFalse(q.isEmpty());
q.add(new PDelay(2));
q.remove();
q.remove();
assertTrue(q.isEmpty());
}
/** clear removes all elements */
public void testClear() {
DelayQueue q = populatedQueue(SIZE);
q.clear();
assertTrue(q.isEmpty());
assertEquals(0, q.size());
assertEquals(Integer.MAX_VALUE, q.remainingCapacity());
PDelay x = new PDelay(1);
q.add(x);
assertFalse(q.isEmpty());
assertTrue(q.contains(x));
q.clear();
assertTrue(q.isEmpty());
}