用 Jest 模拟在工厂类中实例化的对象

我有一个看起来像这样的静态工厂方法：

export default class TheClientWrapper {
  public static async buildClient(credentials: SomeCredentials): Promise<TheClient> {
    const theClient = new TheClient(credentials);
    await theClient.setup();

    return theClient;
  }

  private constructor(credentials: SomeCredentials): {
    // ...some construction
  }
}

我这样做是因为，为了构建客户端，我 need 调用这个异步

setup

我不认为这个 Wrapper 类的调用者必须构造 and 调用

setup

theClient