/**
* tailMap returns map with keys in requested range
*/
public void testTailMapContents() {
ConcurrentNavigableMap map = map5();
NavigableMap sm = map.tailMap(two, true);
assertFalse(sm.containsKey(one));
assertTrue(sm.containsKey(two));
assertTrue(sm.containsKey(three));
assertTrue(sm.containsKey(four));
assertTrue(sm.containsKey(five));