@TestOnly
  public void shutdown() throws Exception {
    myFileWatcherExecutor.submit(() -> {
      for (PluggableFileWatcher watcher : PluggableFileWatcher.EP_NAME.getIterable()) {
        if (watcher != null) {
          watcher.shutdown();
        }
      }
      myTestNotifier = null;
      return null;
    }).get();
  }
@TestOnly
  public void shutdown()