/**
* @test
*/
public function it_fails_when_a_requested_child_node_is_no_array_node_itself()
{
$treeBuilder = new TreeBuilder();
$root = $treeBuilder->root('root');
$root->children()->arrayNode('sub_node')->children()->scalarNode('scalar_node');
$node = $treeBuilder->buildTree();
$this->setExpectedException('Matthias\\SymfonyConfigTest\\Partial\\Exception\\ChildIsNotAnArrayNode', 'Child node "scalar_node" is not an array node (current path: "root.sub_node")');
PartialNode::excludeEverythingNotInPath($node, array('sub_node', 'scalar_node'));
}