# File lib/action_dispatch/testing/assertions/dom.rb, line 28
      def assert_dom_not_equal(expected, actual, message = "")
        expected_dom = HTML::Document.new(expected).root
        actual_dom   = HTML::Document.new(actual).root
        full_message = build_message(message, "<?> expected to be != to\n<?>.", expected_dom.to_s, actual_dom.to_s)

        assert_block(full_message) { expected_dom != actual_dom }
      end