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_processing_instruction.rb
    path of file: ./repos/ruby-packer/ruby/test/rexml/parse
    
    the code of the file until where you have to start completion: require "test/unit"
req
    
      def test_no_name
        exception = assert_raise(REXML::ParseException) do
          parse("<??>")
        end
        assert_equal(<<-DETAIL.chomp, exception.to_s)
Invalid processing instruction node
Line: 1
Position: 4
Last 80 unconsumed characters:
<??>
        DETAIL
      end