/** containsAll(c) is true when c contains a subset of elements */
public void testDescendingContainsAll() {
NavigableSet q = populatedSet(SIZE);
NavigableSet p = dset0();
for (int i = 0; i < SIZE; ++i) {
assertTrue(q.containsAll(p));
assertFalse(p.containsAll(q));
p.add(new Integer(i));
}
assertTrue(p.containsAll(q));
}
/** retainAll(c) retains only those elements of c and reports true if changed */
public void testDescendingRetainAll() {
NavigableSet q = populatedSet(SIZE);
NavigableSet p = populatedSet(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.pollFirst();
}
}