public function testGetLabelForUriReturnsEmptyStringLabelNotFound()
{
$graph = new ExtendedGraph();
$label = "Wuthering Heights";
$s1 = 'http://example.com/resource';
$rdfType = 'http://www.w3.org/1999/02/22-rdf-syntax-ns#type';
$graph->add_resource_triple($s1, $rdfType, 'http://xmlns.com/foaf/0.1/Person');
$graph->add_literal_triple($s1, 'http://www.w3.org/2000/01/rdf-schema#label', $label);
ExtendedGraph::initProperties(array('labelProperties' => array('http://www.w3.org/2000/01/rdf-schema#label2')));
$this->assertEquals($graph->get_label_for_uri($s1), '');
}