anchor.diff:  import 'package:test/src/runner/plugin/platform.dart'; // ignore: implementation_imports
   import 'package:test/src/runner/plugin/hack_register_platform.dart' as hack; // ignore: implementation_imports
   
  +import '../base/common.dart';
   import '../base/file_system.dart';
   import '../base/io.dart';
   import '../base/process_manager.dart';
  
positive.code:       int processObservatoryPort;
        _pipeStandardStreamsToConsole(
          process,
          storeObservatoryPort: (int observatoryPort) {
            assert(processObservatoryPort == null);
            printTrace('test $ourTestCount: using observatory port $observatoryPort from pid ${process.pid} to collect coverage');
            processObservatoryPort = observatoryPort;
          },
          startTimeoutTimer: () {
            new Future<_InitialResult>.delayed(_kTestStartupTimeout, () => timeout.complete());
  
negative.code:   void _pipeStandardStreamsToConsole(
      Process process, {
      void startTimeoutTimer(),
      void storeObservatoryPort(int port),
    }) {
      for (Stream<List<int>> stream in
          <Stream<List<int>>>[process.stderr, process.stdout]) {
  