2つのXMLが同じかどうかだけを調べるチェッカー

XMLEqualityChecker

require 'rubygems'
require 'nokogiri'

module XMLEqualityChecker
  def equal_as_xml(left, right)
    left_x = Nokogiri::XML(left.to_s)
    right_x = Nokogiri::XML(right.to_s)
    compare_element(left_x.root, right_x.root)
  end
  def compare_element(left_elm, right_elm)
    raise "Name unmatch: left:#{left_elm.name}, right:#{right_elm.name}" unless left_elm.name == right_elm.name
    raise "Attributes unmatch: left:#{left_elm.attributes.inspect}, right:#{right_elm.attributes.inspect}" unless equal_attributes?(left_elm, right_elm)
    left_children = left_elm.children
    right_children = right_elm.children
    raise "Children size unmatch: left:#{left_children.size}, right:#{right_children.size}" unless left_children.size == right_children.size
    left_children.each_with_index do |left_child, index|
      right_child = right_children[index]
      compare_element(left_child, right_child)
    end
    true
  end
  def equal_attributes?(left, right)
    return false unless left.keys.sort == right.keys.sort
    left.keys.each do |k|
      return false unless left[k] == right[k]
    end
    true
  end
end