public void testDescendingCeilingEntry() {
ConcurrentNavigableMap map = dmap5();
Map.Entry e1 = map.ceilingEntry(m3);
assertEquals(m3, e1.getKey());
Map.Entry e2 = map.ceilingEntry(zero);
assertEquals(m1, e2.getKey());
Map.Entry e3 = map.ceilingEntry(m5);
assertEquals(m5, e3.getKey());