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

require "helper"

module Nokogiri
  module XML
    class TestElementContent < Nokogiri::TestCase
      def setup
        super
        @xml = Nokogiri::XML(<<~eoxml)
     
    
      def setup
        super
        @xml = Nokogiri::XML(<<~eoxml)
          <?xml version="1.0"?><?TEST-STYLE PIDATA?>
          <!DOCTYPE staff SYSTEM "staff.dtd" [
             <!ELEMENT br EMPTY>
             <!ELEMENT div1 (head, (p | list | note)*, div2*)>
             <!ELEMENT div2 (tender:love)>
          ]>
          <root/>
        eoxml
        @elements = @xml.internal_subset.children.find_all do |x|
          x.type == Nokogiri::XML::Node::ELEMENT_DECL
        end
        @tree = @elements[1].content
      end