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_rdoc_generator_json_index.rb
    path of file: ./repos/truffleruby/test/mri/tests/rdoc
    
    the code of the file until where you have to start completion: # coding: US-ASCII
# frozen_string_literal: true

require_relative 'helper'

class TestRDocGeneratorJsonIndex < RDoc::TestCase

  def setup
    super

    @tmpdir = Dir.mktmpdir "test_rdoc_generator_darkfish_#{$$}_"
    FileUtils.mkdir_p @tmpdir

    @options = RDoc::Options.new
    @options.files = []
    # JsonIndex is used in conjunction wi
    
  def test_generate_utf_8
    text = "5\xB0"
    text = RDoc::Encoding.change_encoding text, Encoding::ISO_8859_1
    @klass.add_comment comment(text), @top_level

    @g.generate

    json = File.read 'js/search_index.js'
    json.force_encoding Encoding::UTF_8

    json =~ /\Avar search_data = /

    index = $'

    index = JSON.parse index

    klass_record = @klass.search_record[2..-1]
    klass_record[-1] = "<p>5\xc2\xb0\n"
    klass_record[-1] = RDoc::Encoding.change_encoding klass_record[-1], Encoding::UTF_8

    info = [
      klass_record,
      @nest_klass.search_record[2..-1],
      @meth.search_record[2..-1],
      @nest_meth.search_record[2..-1],
      @page.search_record[2..-1],
    ]

    expected = {
      'index' => {
        'searchIndex' => [
          'c',
          'd',
          'meth()',
          'meth()',
          'page',
        ],
        'longSearchIndex' => [
          'c',
          'c::d',
          'c#meth()',
          'c::d#meth()',
          '',
        ],
        'info' => info,
      },
    }

    assert_equal expected, index
  end