Functional._createServerWorker(port, requestedPorts)
- port (Integer)
- requestedPorts (Integer)
function (port, requestedPorts) {
    var self           = this,
        serverInstance = this._getServerInstance(port, requestedPorts);

    this.servers.push(serverInstance);

    serverInstance.on('readyForTests', function () {
      self._runTestOnServer(serverInstance);
    });

    serverInstance.on('done', function () {
      self._incrementDone();
    });

    serverInstance.on('testResults', this.reporter.handleTestResults.bind(this.reporter));

    serverInstance.on('suiteDone', function (suite) {
      self.finishedSuitesCount++;
      self.finishedSuites.push(suite.data);
    });
  }