/** @throws Exception If failed. */
public void testPoll() throws Exception {
ConcurrentLinkedDeque8<Integer> deque = new ConcurrentLinkedDeque8<>();
deque.add(1);
deque.add(2);
deque.add(3);
assert !deque.isEmpty();
checkSize(deque, 3);
// Poll 1.
assertEquals(Integer.valueOf(1), deque.poll());
assert !deque.isEmpty();
checkSize(deque, 2);
// Poll 2.
assertEquals(Integer.valueOf(2), deque.poll());
assert !deque.isEmpty();
checkSize(deque, 1);
// Poll 3.
assertEquals(Integer.valueOf(3), deque.poll());
assert deque.isEmpty();
checkSize(deque, 0);
}
public void testEmptyDeque() {
ConcurrentLinkedDeque8<Integer> deque = new ConcurrentLinkedDeque8<>();
assert deque.poll() == null;
assert deque.pollFirst() == null;
assert deque.pollLast() == null;
assert deque.peek() == null;
assert deque.peekFirst() == null;
assert deque.peekLast() == null;
checkSize(deque, 0);
}