@Test
public void testClearValues()
{

	final Var v = Var.alloc("v");
	final Var x = Var.alloc("x");

	handler.addValueVar( query.getPrefixMapping(), v );
	handler.addValueVar( query.getPrefixMapping(), x );
	handler.addValueRow( query.getPrefixMapping(), Arrays.asList("<one>", "three"));
	handler.addValueRow( query.getPrefixMapping(), Arrays.asList("<two>", "four" ));
	handler.clearValues();
	Map<Var,List<Node>> map = handler.getValuesMap();
	assertTrue( map.isEmpty());	
}