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_error_highlight.rb
    path of file: ./repos/ruby/test/error_highlight
    
    the code of the file until where you have to start completion: require "test/unit"

require "error_highlight"
require "tempfile"

class ErrorHighlightTest < Test::Unit::TestCase
  class Du
    
  def test_OPCALL_binary_3
    assert_error_message(NoMethodError, <<~END) do
undefined method `+' for #{ NIL_RECV_MESSAGE }

      (nil) + 42
            ^
    END

      (nil) + 42
    end
  end