code: protected List<File> getSpooledFileList()
      {
          final List<File> spooledFileList = new ArrayList<File>();
  
          for (final File file : spoolDirectory.listFiles()) {
              if (file.isFile()) {
                  spooledFileList.add(file);
              }
          }
  
          return spooledFileList;
      }
docs: protected for overriding during unit tests