def save_all
      reports = to_h
      reports.each do |file, report|
        File.write(file, report)
      end

      reports.keys
    end
def save_all
      reports = to_h
      reports.each do |file, report|
        File.write(file, report)
      end

      reports.keys
    end
Save all of the reports to the corresponding files.

 @return [Array<String>] An array of file paths.