assertTrue(! iter.hasNext() );
while( expected.hasPrevious() ) {
assertTrue(iter.hasPrevious());
assertEquals(expected.nextIndex(),iter.nextIndex());
assertEquals(expected.previousIndex(),iter.previousIndex());
assertEquals(expected.previous(),iter.previous());
assertTrue(iter.hasNext());
assertEquals(expected.nextIndex(),iter.nextIndex());
assertEquals(expected.previousIndex(),iter.previousIndex());