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_pack.rb
    path of file: ./repos/artichoke/artichoke-backend/vendor/ruby/test/ruby
    
    the code of the file until where you have to start completion: # coding: US-ASCII
# frozen_string_literal: false
require 'test/unit'

class TestPack < Test::Unit::TestCase
  def test_pack
    $format = "c2x5CCxsdils_l_a6";
    # Need the expression in here to force ary[5] to be numeric.  This avoids
    # test2 failing because ary2 goes str->numeric->str and ary does not.
    ary = [1,-100,127,128,32767,987.654321098 / 100.0,12345,123456,-32767,-123456,"abcdef"]
    $x = ary.pack($format)
    ary2 = $x.unpack($format)

    assert_equal(ary.length, ary2.length)
    assert_equal(ary.join(':'), ary2.join(':'))
    assert_match(/def/, $x)

    $x = [-1073741825]
    assert_equal($x, $x.pack("q").unpack("q"))

    $x = [-1]
    assert_equal($x, $x.pack("l").unpack("l"))
  end

  def test_pack_n
    assert_equal "\000\000", [0].pack('n')
    assert_equal "\000\001", [1].pack('n')
    assert_equal "\000\002", [2].pack('n')
    assert_equal "\000\003", [3].pack('n')
    assert_equal "\377
    
  def test_pack_unpack_m
    assert_equal("", [""].pack("m"))
    assert_equal("AA==\n", ["\0"].pack("m"))
    assert_equal("AAA=\n", ["\0\0"].pack("m"))
    assert_equal("AAAA\n", ["\0\0\0"].pack("m"))
    assert_equal("/w==\n", ["\377"].pack("m"))
    assert_equal("//8=\n", ["\377\377"].pack("m"))
    assert_equal("////\n", ["\377\377\377"].pack("m"))

    assert_equal([""], "".unpack("m"))
    assert_equal(["\0"], "AA==\n".unpack("m"))
    assert_equal(["\0\0"], "AAA=\n".unpack("m"))
    assert_equal(["\0\0\0"], "AAAA\n".unpack("m"))
    assert_equal(["\377"], "/w==\n".unpack("m"))
    assert_equal(["\377\377"], "//8=\n".unpack("m"))
    assert_equal(["\377\377\377"], "////\n".unpack("m"))
    assert_equal([""], "A\n".unpack("m"))
    assert_equal(["\0"], "AA\n".unpack("m"))
    assert_equal(["\0"], "AA=\n".unpack("m"))
    assert_equal(["\0\0"], "AAA\n".unpack("m"))

    bug10019 = '[ruby-core:63604] [Bug #10019]'
    size = ((4096-4)/4*3+1)
    assert_separately(%W[- #{size} #{bug10019}], <<-'end;')
      size = ARGV.shift.to_i
      bug = ARGV.shift
      assert_equal(size, ["a"*size].pack("m#{size+2}").unpack("m")[0].size, bug)
    end;
  end