@Test (expected=UnsupportedOperationException.class)
public void testTOverlapsUnsuported() throws Exception{
FilterFactory ff = CommonFactoryFinder.getFilterFactory((Hints) null);
TOverlaps filter = ff.toverlaps(ff.property("date"), newSampleDate());
FilterToCQL toCQL = new FilterToCQL();
filter.accept( toCQL, null ).toString();
}