public void testPollLastEntry() {
ConcurrentNavigableMap map = map5();
Map.Entry e = map.pollLastEntry();
assertEquals(five, e.getKey());
assertEquals("E", e.getValue());
e = map.pollLastEntry();
assertEquals(four, e.getKey());
map.put(five, "E");
e = map.pollLastEntry();
assertEquals(five, e.getKey());
assertEquals("E", e.getValue());