public void test_DescendingSubMap_firstEntry() {
NavigableMap decendingMap = tm.descendingMap();
assertEquals(999, decendingMap.firstEntry().getValue());
decendingMap = navigableMap_startExcluded_endExcluded.descendingMap();
assertEquals(108, decendingMap.firstEntry().getValue());
decendingMap = navigableMap_startExcluded_endIncluded.descendingMap();
assertEquals(109, decendingMap.firstEntry().getValue());
decendingMap = navigableMap_startIncluded_endExcluded.descendingMap();