anchor.diff:                     .then((success) =>  expect(success, isTrue));
       });
   
  -    test('Defaut baudrate 9600', () {
  -      var serial =  new SerialPort(dummySerialPort.path);
  -      expect(serial.baudrate, 9600);
  -    });
  -
       test('Just write', () {
         var serial =  new SerialPort(dummySerialPort.path);
         serial.open().then((_) => serial.write("Hello"))
  
positive.code: import 'dart:math';
  
  void main() {
    var dummySerialPort;
    var random = new Random();
    group('Serial port', () {
      setUp(() {
        //dummySerialPort = new File("dummySerialPort-${random.nextInt(999)}.tmp").createSync();
        dummySerialPort = new File("dummySerialPort.tmp");
        return dummySerialPort.create();
      });
  
negative.code:                       expect(success, isTrue);
                        serial.close();
                     });
      });
  
      test('Defaut baudrate 9600', () {
        var serial =  new SerialPort(dummySerialPort.path);
        expect(serial.baudrate, 9600);
      });
  
      test('Fail with unkwnon portname', (){
  