Php Symfony 2语义包配置$在扩展类中配置为空

我没有太多的运气尝试得到一个简单的捆绑语义配置示例，用于Symfony 2.5.2

我正在关注这个

我的捆绑包是位于名称空间Tetranz\MyTestBundle的TetranzMyTestBundle

配置包含来自代码生成器的此项

public function getConfigTreeBuilder()
{
    $treeBuilder = new TreeBuilder();
    $rootNode = $treeBuilder->root('tetranz_my_test');

    // Here you should define the parameters that are allowed to
    // configure your bundle. See the documentation linked above for
    // more information on that topic.

    return $treeBuilder;
}

public function load(array $configs, ContainerBuilder $container)
{
    $configuration = new Configuration();
    $config = $this->processConfiguration($configuration, $configs);

    $loader = new Loader\XmlFileLoader($container, new FileLocator(__DIR__.'/../Resources/config'));
    $loader->load('services.xml');
}

TetranzMyTestExtension也包含代码生成器中的内容

public function getConfigTreeBuilder()
{
    $treeBuilder = new TreeBuilder();
    $rootNode = $treeBuilder->root('tetranz_my_test');

    // Here you should define the parameters that are allowed to
    // configure your bundle. See the documentation linked above for
    // more information on that topic.

    return $treeBuilder;
}

public function load(array $configs, ContainerBuilder $container)
{
    $configuration = new Configuration();
    $config = $this->processConfiguration($configuration, $configs);

    $loader = new Loader\XmlFileLoader($container, new FileLocator(__DIR__.'/../Resources/config'));
    $loader->load('services.xml');
}

app/config/config.yml

包含：

tetranz_my_test:
    setting1:value1

如果我正确地阅读了cookbook页面，那么应该可以，但是上面load（）方法中的$configs包含一个空数组元素$config是一个空数组

我一定错过了什么明显的东西。我曾尝试在配置类中添加一些结构（Children（）等），但没有帮助

谢谢你

我的config.yml中冒号后面没有空格。仅此而已：）