text: (function(){
      "use strict";
  
      var Gpio = require('onoff').Gpio,
          redled = new Gpio(17, 'out'),
          greenled = new Gpio(18, "out"),
          iv;
      redled.writeSync(1);
      iv = setInterval(function () {
          redled.writeSync(redled.readSync() ^ 1);
          greenled.writeSync(greenled.readSync() ^ 1);
      }, 100);
  
      setTimeout(function () {
          clearInterval(iv);
  
          redled.writeSync(0);
          redled.unexport();
          greenled.writeSync(0);
          greenled.unexport();
          console.log('ok - ' + __filename);
      }, 10000);
  })();