// Sort by the comparator used in the makeEmptyBidiMap() method
List newSortedKeys = Arrays.asList(getSampleKeys());
Collections.sort(newSortedKeys, new ReverseComparator(ComparableComparator.getInstance()));
newSortedKeys = Collections.unmodifiableList(newSortedKeys);
Iterator mapIter = sm.keySet().iterator();
Iterator expectedIter = newSortedKeys.iterator();
while (expectedIter.hasNext()) {
Object expectedKey = expectedIter.next();
Object mapKey = mapIter.next();
assertNotNull("key in sorted list may not be null", expectedKey);