anchor.diff:  import "dart:io";
   import "package:async_helper/async_minitest.dart";
   
  -void testNoPackages(String filePath, String uri, String expected) {
  +void testNoPackages(String filePath, Uri uri, String expected) {
     File mainIsolate = new File(filePath);
     mainIsolate.writeAsStringSync('''
       library spawn_tests;
  
positive.code: 
    try {
      // Isolate Spawning another Isolate without any package specification.
      testNoPackages("$tmpDirPath/no_package_isolate.dart", noPackageIsolate.path,
          're: no package');
    } finally {
      tmpDir.deleteSync(recursive: true);
    }
  
negative.code:   var args = <String>[];
    args.add(mainIsolate.path);
    var result = Process.runSync(exec, args);
    print('stdout: ${result.stdout}');
    print('stderr: ${result.stderr}');
    expect(result.stdout.contains('$expected'), true);
  }
  
  