private static GcsFilename createOldGcsFileName(long reportId, String fileName) {
   return new GcsFilename(
       AppIdentityServiceFactory.getAppIdentityService().getDefaultGcsBucketName(),
       String.format(Locale.US, "%d/%s", reportId, fileName));
 }
 @Before
 public void setUp() {
   appIdentity = AppIdentityServiceFactory.getAppIdentityService();
 }
 private static String getBucket() {
   return AppIdentityServiceFactory.getAppIdentityService().getDefaultGcsBucketName();
 }