public function testAddDriverSettings()
 {
     $treeBuilder = new TreeBuilder();
     $rootNode = $treeBuilder->root('stash');
     $configuration = new Configuration();
     $configuration->addDriverSettings('Memcache', $rootNode->children());
     $memcacheNode = $rootNode->getNode('Memcache');
     $this->assertInstanceOf('Symfony\\Component\\Config\\Definition\\ArrayNode', $memcacheNode, 'Config generator makes Memcache nodes when requested');
     $treeBuilder = new TreeBuilder();
     $rootNode = $treeBuilder->root('stash');
     $configuration = new Configuration();
     $configuration->addDriverSettings('Redis', $rootNode->children());
     $memcacheNode = $rootNode->getNode('Redis');
     $this->assertInstanceOf('Symfony\\Component\\Config\\Definition\\ArrayNode', $memcacheNode, 'Config generator makes Redis nodes when requested');
 }