public function testReplaceUris()
{
$graph = new ExtendedGraph();
$graph->add_literal_triple('http://some/subject/1', 'http://some/predicate', 'some object');
$graph->add_literal_triple('http://some/subject/4', 'http://some/predicate', 'http://some/subject/1');
$graph->add_resource_triple('http://some/subject/2', 'http://some/predicate', 'http://some/subject/1');
$graph->replace_uris('http://some/subject/1', 'http://some/subject/3');
$index = $graph->get_index();
$this->assertFalse($graph->has_triples_about('http://some/subject/1'), "resource with old uri still exists");
$this->assertTrue($graph->has_triples_about('http://some/subject/3'), "resource with new uri doesn't exists");
$this->assertEquals('http://some/subject/3', $index['http://some/subject/2']['http://some/predicate'][0]['value'], "http://some/subject/3");
$this->assertTrue($graph->has_literal_triple('http://some/subject/4', 'http://some/predicate', 'http://some/subject/1'), "literal values should not be replaced");
$graph->replace_uris('http://some/predicate', 'http://some/predicate2');
$index = $graph->get_index();
$this->assertTrue(isset($index['http://some/subject/2']['http://some/predicate2']), "predicate should be replaced");
$this->assertFalse(isset($index['http://some/subject/2']['http://some/predicate']), "predicate should be replaced and old one not be in graph");
}