function test_get_bnodes()
{
$input = array('_:a' => array(RDFS_SEEALSO => array(array('value' => '_:b', 'type' => 'bnode'))));
$graph = new SimpleGraph($input);
$actual = $graph->get_bnodes();
$expected = array('_:a', '_:b');
$this->assertEquals($expected, $actual, "get_bnodes() should return bnodes in subject and object positions");
}
