protected function getAssetCacheManager()
{
$serviceLocator = $this->getMock(ServiceLocatorInterface::class);
$config = array(self::$assetName => array('cache' => 'FilePathCache', 'options' => array('dir' => sys_get_temp_dir())));
$assetCacheManager = new AssetCacheManager($serviceLocator, $config);
return $assetCacheManager;
}