/** putAll adds all key-value pairs from the given map */
 public void testDescendingPutAll() {
   ConcurrentNavigableMap empty = dmap0();
   ConcurrentNavigableMap map = dmap5();
   empty.putAll(map);
   assertEquals(5, empty.size());
   assertTrue(empty.containsKey(m1));
   assertTrue(empty.containsKey(m2));
   assertTrue(empty.containsKey(m3));
   assertTrue(empty.containsKey(m4));
   assertTrue(empty.containsKey(m5));
 }
 /** putAll adds all key-value pairs from the given map */
 public void testPutAll() {
   ConcurrentNavigableMap empty = map0();
   ConcurrentNavigableMap map = map5();
   empty.putAll(map);
   assertEquals(5, empty.size());
   assertTrue(empty.containsKey(one));
   assertTrue(empty.containsKey(two));
   assertTrue(empty.containsKey(three));
   assertTrue(empty.containsKey(four));
   assertTrue(empty.containsKey(five));
 }