Method OnError

test/async_worker.cc:181–183

  void Execute() override {}
  virtual void OnOK() override { _deferred.Resolve(Env().Undefined()); }
  virtual void OnError(const Napi::Error& /* e */) override {
    _deferred.Reject(Env().Undefined());
  }

 private:
  TestWorkerNoCallback(Napi::Env env)