# File test_format.rb, line 456
  def helper_test_scientific (body_fmt, file_name)
    File.open(file_name, 
              File::CREAT | File::WRONLY | File::TRUNC) { |file|
      body_fmt.io = file
      int = 12
      exp = 1.234e-14
      mid = 123.4567E23
      big = 123.4567E200
      little = 12.34e-20
      body_fmt.printFormat(binding)
    }
  end