function test_order_uris_by_property()
{
$ex = "http://example.com/";
$turtle = <<<_TTL_
@base <{$ex}> .
<a> <p> 2 .
<b> <p> 3 .
<c> <p> 1 .
_TTL_;
$graph = new SimpleGraph();
$graph->from_turtle($turtle);
$uris = array($ex . 'a', $ex . 'b', $ex . 'c');
$expected = array($ex . 'c', $ex . 'a', $ex . 'b');
$actual = $graph->order_uris_by_property($uris, $ex . 'p');
$this->assertEquals($expected, $actual, "order_uris_by_property should order the uris in ascending order of the value of the property");
$expected_reverse = array($ex . 'b', $ex . 'a', $ex . 'c');
$actual = $graph->order_uris_by_property($uris, $ex . 'p', 1);
$this->assertEquals($expected_reverse, $actual, "order_uris_by_property should order the uris in ascending order of the value of the property");
}
