如何从课堂上开玩笑模拟函数

Question

我有一个带有函数 getSettingtHis 和 getLastIndex 的类，它们在辅助函数中使用，如何在单元测试中模拟这些值，以便我在 trackSetting< 中测试逻辑/p>

export class SettingController {
  #setting: [];
  constructor() {
    this.#setting = [];
    this.#lastIndex = 0;
  }

  getSettingHis(): [] {
    return this.#setting;
  }

  getLastIndex(): number {
    return this.#lastIndex;
  }

}

export function trackSetting(): boolean {
  let hasSetting = false;
  const lastIndex = settingController.getLastIndex();
  const totalSettingHistory = [...settingController.getSettingHis()]
  //** logic checking */
}