You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: test_argf.rb
    path of file: ./repos/ruby-packer/ruby/test/ruby
    
    the code of the file until where you have to start completion: # frozen_string_literal: false
require 'test/unit'
require 'timeout'
require 'tmpdir'
require 'tempfile
    
  def test_tell
    ruby('-e', "#{<<~"{#"}\n#{<<~'};'}", @t1.path, @t2.path, @t3.path) do |f|
      {#
        begin
          ARGF.binmode
          loop do
            p ARGF.tell
            p ARGF.gets
          end
        rescue ArgumentError
          puts "end"
        end
      };
      a = f.read.split("\n")
      [0, 2, 4, 2, 4, 2, 4].map {|i| i.to_s }.
        zip((1..6).map {|i| '"' + i.to_s + '\n"' } + ["nil"]).flatten.
        each do |x|
        assert_equal(x, a.shift)
      end
      assert_equal('end', a.shift)
    end