public function testRemoveResourceFromSequence()
{
$graph = new ExtendedGraph();
$s = 'http://sequence';
$sub1 = 'http://sub1';
$sub2 = 'http://sub2';
$sub3 = 'http://sub3';
$graph->add_resource_to_sequence($s, $sub1);
$graph->add_resource_to_sequence($s, $sub2);
$graph->add_resource_to_sequence($s, $sub3);
$graph->remove_resource_from_sequence($s, $sub2);
$sequenceValues = $graph->get_sequence_values($s);
$this->assertEquals(array($sub1, $sub3), $sequenceValues, 'There should be two sequence values, in the correct order');
$this->assertTrue($graph->has_resource_triple($s, ExtendedGraph::rdf . "_1", $sub1));
$this->assertTrue($graph->has_resource_triple($s, ExtendedGraph::rdf . "_2", $sub3));
}