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_iso_8859.rb
    path of file: ./repos/truffleruby/test/mri/tests/ruby/enc
    
    the code of the file until where you have to start completion: # frozen_string_literal: false
require 'test/unit'

class TestISO8859 < Test::Unit::TestCase
  ASSERTS = %q(
    assert_match(/^(\xdf)\1$/i, "\xdf\xdf")
    assert_match(/^(\xdf)\1$/i, "ssss")
    # assert_match(/^(\xdf)\1$/i, "\xdfss") # this must be bug.
    
  def test_iso_8859_5
    eval(%q(# encoding: iso8859-5
      (0xb0..0xcf).each do |c|
        c1 = c.chr("iso8859-5")
        c2 = (c + 0x20).chr("iso8859-5")
        assert_match(/^(#{ c1 })\1$/i, c2 + c1)
        assert_match(/^(#{ c2 })\1$/i, c1 + c2)
        assert_match(/^[#{ c1 }]+$/i, c2 + c1)
        assert_match(/^[#{ c2 }]+$/i, c1 + c2)
      end
      ((0xa1..0xaf).to_a - [0xad]).each do |c|
        c1 = c.chr("iso8859-5")
        c2 = (c + 0x50).chr("iso8859-5")
        assert_match(/^(#{ c1 })\1$/i, c2 + c1)
        assert_match(/^(#{ c2 })\1$/i, c1 + c2)
        assert_match(/^[#{ c1 }]+$/i, c2 + c1)
        assert_match(/^[#{ c2 }]+$/i, c1 + c2)
      end
    ))
  end