code: func newWifiStater(fixtures string) (wifiStater, error) {
  	if fixtures != "" {
  		return &mockWifiStater{
  			fixtures: fixtures,
  		}, nil
  	}
  
  	return wifi.New()
  }
docs: // All code below this point is used to assist with end-to-end tests for
  // the wifi collector, since wifi devices are not available in CI.
  // newWifiStater determines if mocked test fixtures from files should be used for
  // collecting wifi metrics, or if package wifi should be used.