add_status

# File lib/test/unit.rb, line 431
      def add_status(line)
        unless @options[:job_status] == :replace
          print(line)
          return
        end
        @status_line_size ||= 0
        line = line[0...(terminal_width-@status_line_size)]
        print line
        $stdout.flush
        @status_line_size += line.size
      end