anchor.diff: -library test_serial_port;
  -
  -import 'package:unittest/unittest.dart';
  -import 'package:serial_port/serial_port.dart';
  -import 'dart:io';
  -import 'dart:math';
   // Copyright (c) 2014, Nicolas François
   //
   // Licensed under the Apache License, Version 2.0 (the "License");
  
positive.code:       return dummySerialPort.create();
      });
      tearDown(() => dummySerialPort.delete());
  
      test('Open', () {
        var serial =  new SerialPort(dummySerialPort.path, baudrate: 9600);
  
negative.code: // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  // See the License for the specific language governing permissions and
  // limitations under the License.
  
  library test_serial_port;
  
  import 'package:unittest/unittest.dart';
  import 'package:serial_port/serial_port.dart';
  import 'dart:io';
  import 'dart:math';
  import 'dart:async';
  
  void main() {
    File dummySerialPort;
  