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