public function testItCanBeConvertedToAnArray()
 {
     assertEquals(['keyA' => 'valueA', 'group1' => ['keyB' => 'valueB', 'null' => null]], $this->config->asArray());
 }
 /**
  * @param ApplicationConfig $config
  */
 public function __construct(ApplicationConfig $config)
 {
     parent::__construct(new RecursiveArrayIterator($config->asArray()), RecursiveIteratorIterator::SELF_FIRST);
     $this->separator = $config->getSeparator();
 }