@Test
public void testPollLastEntry() {

    IncrementalSortMap<Integer, String> 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());
    e = map.pollLastEntry();
    assertEquals(three, e.getKey());
    map.remove(two);
    e = map.pollLastEntry();
    assertEquals(one, e.getKey());
    try {
        e.setValue("E");
        shouldThrow();
    }
    catch (UnsupportedOperationException success) {}
    e = map.pollLastEntry();
    assertNull(e);
}