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_builder.rb
    path of file: ./repos/nokogiri/test/html5
    
    the code of the file until where you have to start completion: # frozen_string_literal: true

require "helper"

class TestHTML5Builder < Nokogiri::TestCase
  def test_buil
    
  def test_builder_returns_html5_document
    html_doc = Nokogiri::HTML5::Builder.new do
      div("hello")
    end

    assert_kind_of(Nokogiri::HTML5::Document, html_doc.doc)
  end