用茉莉花測試錯誤和承諾

測試錯誤和承諾。我有一個類似的情況如下：

public myUtilityMethod(): Promise<string> {
  // some synchronous stuff
  console.log('bla bla');
  // some asynchronous stuff
  return Promise.resolve('ok');
}
public async doSomething(): Promise<void> {
  let promise;
  try {
    promise = this.myUtilityMethod();
  } catch (e) {
    throw new MyError('I knew it', e, {});
  }
  await Promise.all([promise]);
  return Promise.resolve();
}

我想測試一下，當(dāng)myUtilityMethod的同步部分出錯時，我拋出一個MyError，所以我編寫以下測試

it('should throw MyError when something goes wrong in the synchronous part of myUtilityMethod', fakeAsync(() => {
  // given
  const error = new Error('something went wrong');
  component.myUtilityMethod = sinon.stub().throws(error);
  // when
 expect(() => {
   component.doSomething();
   flushMicrotasks();
 }).toThrow(jasmine.any(MyError));
}));

測試失敗是因為

        Error: Expected function to throw <jasmine.any(MyError)>, but it threw Error: Uncaught (in promise): MyError: {"message":"i knew it","nativeError":{},"context":{}}.

我是不是漏掉了什么明顯的東西？