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_gc.rb
    path of file: ./repos/oj/test
    
    the code of the file until where you have to start completion: #!/usr/bin/env ruby
# frozen_string_literal: true

$LOAD_PATH << __dir__

require 'helper'

class GCTest < Minitest::Test
  class Goo
    attr_accessor :x, :child

    def initialize(x, child)
      @x = x
      @child = child
    end

    def to_hash
      { 'json_class' => self.class.to
    
  def test_parse_gc
    json = '{"a":"Alpha","b":true,"c":12345,"d":[true,[false,[-123456789,null],3.9676,["Something else.",false],null]],"e":{"zero":null,"one":1,"two":2,"three":[3],"four":[0,1,2,3,4]},"f":null,"h":{"a":{"b":{"c":{"d":{"e":{"f":{"g":null}}}}}}},"i":[[[[[[[null]]]]]]]}'

    50.times do
      data = Oj.load(json)
      assert_equal(json, Oj.dump(data))
    end
  end