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_parser.rb
    path of file: ./repos/nokogiri/test/html4/sax
    
    the code of the file until where you have to start completion: # -*- coding: utf-8 -*-
# frozen
    
        def test_parse_document
          @parser.parse_memory(<<-eoxml)
            <p>Paragraph 1</p>
            <p>Paragraph 2</p>
          eoxml

          # JRuby version is different because of the internal implementation
          # JRuby version uses NekoHTML which inserts empty "head" elements.
          #
          # Currently following features are set:
          # "http://cyberneko.org/html/properties/names/elems" => "lower"
          # "http://cyberneko.org/html/properties/names/attrs" => "lower"
          if Nokogiri.uses_libxml?
            assert_equal(
              [["html", []], ["body", []], ["p", []], ["p", []]],
              @parser.document.start_elements,
            )
          else
            assert_equal(
              [["html", []], ["head", []], ["body", []], ["p", []], ["p", []]],
              @parser.document.start_elements,
            )
          end