public function testRootNode()
{
$root = new Node(null, '');
$this->assertEquals(null, $root->get_description());
$this->assertEquals('', $root->get_name());
$this->assertEquals(null, $root->get_parent());
$this->assertEquals($root, $root->get_root());
$this->assertEquals(array(), $root->get_dependencies());
return $root;
}