quit_workers

# File lib/test/unit.rb, line 485
      def quit_workers
        return if @workers.empty?
        @workers.reject! do |worker|
          begin
            timeout(1) do
              worker.quit
            end
          rescue Errno::EPIPE
          rescue Timeout::Error
          end
          worker.close
        end

        return if @workers.empty?
        begin
          timeout(0.2 * @workers.size) do
            Process.waitall
          end
        rescue Timeout::Error
          @workers.each do |worker|
            worker.kill
          end
          @worker.clear
        end
      end