public void test_AscendingSubMapEntrySet_pollFirst_startExcluded_endIncluded() {
Set entrySet = navigableMap_startExcluded_endIncluded.entrySet();
if (entrySet instanceof NavigableSet) {
NavigableSet ascendingSubMapEntrySet = (NavigableSet) entrySet;
for (int value = 101; value < 110; value++) {
Entry entry = (Entry) ascendingSubMapEntrySet.pollFirst();
assertEquals(value, entry.getValue());
}
assertTrue(ascendingSubMapEntrySet.isEmpty());
// should return null if the set is empty.
assertNull(ascendingSubMapEntrySet.pollFirst());