/** descendingkeySet.toArray returns contains all keys */ public void testDescendingDescendingKeySetToArray() { ConcurrentNavigableMap map = dmap5(); Set s = map.descendingKeySet(); Object[] ar = s.toArray(); assertEquals(5, ar.length); assertTrue(s.containsAll(Arrays.asList(ar))); ar[0] = m10; assertFalse(s.containsAll(Arrays.asList(ar))); }