/**
* This graph has a link to a non-existent node. We verify that throws an exception.
*/
public function test_get_suggested_node_names()
{
$graph = new stack_abstract_graph();
$graph->add_node(1, 2, 3);
$graph->add_node(2, 7, null);
$graph->add_node(3, 2, 4);
$graph->add_node(4, 5, 6);
$graph->add_node(5, null, 9);
$graph->add_node(6, null, null);
$graph->add_node(7, null, null);
$graph->add_node(9, null, null);
$graph->layout();
$newnames = $graph->get_suggested_node_names();
$this->assertEquals(array(1 => 1, 3 => 2, 2 => 3, 7 => 4, 4 => 5, 5 => 6, 9 => 7, 6 => 8), $newnames);
}
