public function testGetResources()
{
$graph = new ExtendedGraph();
$graph->add_literal_triple('http://some/subject/1', 'http://some/predicate/p1', 'some object');
$graph->add_resource_triple('http://some/subject/2', 'http://some/predicate/p2', 'http://some/object/1');
$graph->add_resource_triple('http://some/subject/3', 'http://some/predicate/p3', 'http://some/object/2');
$graph->add_literal_triple('http://some/subject/1', 'http://some/predicate/p3', 'http://this/is/not/a/rsource');
$expected = array('http://some/subject/1', 'http://some/subject/2', 'http://some/subject/3', 'http://some/object/1', 'http://some/object/2');
$actual = $graph->get_resources();
sort($expected);
sort($actual);
$this->assertEquals(count($expected), count($actual), 'should get same number of resource uris');
$this->assertEquals($expected, $actual, 'should get expected array containing all the resource uris');
}
