{ { 0, 1 }, { 1, 2 } },
} );
DocumentIterator differenceIterator = DifferenceDocumentIterator.getInstance( minuendIterator, subtrahendIterator );
assertTrue( differenceIterator.hasNext() );
assertEquals( 1, differenceIterator.nextDocument() );
assertEquals( Interval.valueOf( 0, 1 ), differenceIterator.intervalIterator().nextInterval() );
assertEquals( Interval.valueOf( 1, 2 ), differenceIterator.intervalIterator().nextInterval() );
assertFalse( differenceIterator.intervalIterator().hasNext() );
assertEquals( 2, differenceIterator.nextDocument() );
assertEquals( IntervalIterators.TRUE, differenceIterator.intervalIterator() );
assertFalse( differenceIterator.hasNext() );