anchor.diff:        fs.systemTempDirectory.createTempSync('flutter_fuchsia_tester.');
     try {
       Cache.flutterRoot = tempDir.path;
  -    final Directory testDirectory =
  -        fs.directory(argResults[_kOptionTestDirectory]);
   
       final String shellPath = argResults[_kOptionShell];
       if (!fs.isFileSync(shellPath)) {
  
positive.code:     PackageMap.globalPackagesPath =
          fs.path.normalize(fs.path.absolute(argResults[_kOptionPackages]));
  
      CoverageCollector collector;
      if (argResults['coverage']) {
        collector = CoverageCollector();
      }
  
  
  
negative.code: const List<String> _kRequiredOptions = <String>[
    _kOptionPackages,
    _kOptionShell,
    _kOptionSdkRoot,
    _kOptionIcudtl,
    _kOptionTests,
  