protected function initCompilationDirectory()
    {
        $fileStorage = \tao_models_classes_service_FileStorage::singleton();
        $directoryIds = explode('|', $this->getTestCompilationUri());
        $directories = array(
            'private' => $fileStorage->getDirectoryById($directoryIds[0]),
            'public' => $fileStorage->getDirectoryById($directoryIds[1])
        );

        $this->compilationDirectory = $directories;
    }