# File lib/test/unit/failure.rb, line 112
      def add_failure(message, backtrace, options={})
        default_options = {
          :method_name => @method_name,
          :source_location => self[:source_location],
        }
        failure = Failure.new(name, filter_backtrace(backtrace), message,
                              default_options.merge(options))
        current_result.add_failure(failure)
      end