code: function () {
      var self = this,
          runner;
  
      process.send({
        type     : 'runnerId',
        runnerId : cluster.worker.id
      });
  
      MinorTest.port           = process.env.WORKER_PORT;
      MinorTest.requestedPorts = this.getRequestedPorts();
  
      switch (process.env.TEST_TYPE) {
        case 'cucumber':
          runner = new CucumberRunner();
          break;
        case 'mocha':
        default:
          runner = new MochaRunner();
      }
  
      return runner.start();
    }
docs: ////////////////////////////////////////////////////////////////////////// Public methods ///////////////////////////////////////////////////////// //////////////////////////////////////////////////////////////////////// 
  Runner.start() -> Object