/**
* descendingkeySet.toArray returns contains all keys
*/
public void testDescendingKeySetToArray() {
SnapTreeMap map = map5();
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)));