使用 Jest 测试异步类方法的问题

Question

我有一个类，它有一个名为 init() 的异步构造函数。我正在尝试为它创建一个测试，但我遇到了一些问题。代码工作正常，但测试给出以下错误：

超时 - 在 5000 毫秒超时内未调用异步回调 由 jest.setTimeout.Timeout 指定 - 未调用异步回调 在 jest.setTimeout.Error 指定的 5000 毫秒超时内：

这是课程：

const { Settings } = require("../models/settings");
const moment = require("moment");

class Config {

  async init() {

    let settings = await Settings.findOne(); // This looks like the line where it gets stuck
    if (!settings) settings = await createDefaultConfig();

    this.lastBookableDay = settings.lastBookableDay;
    this.slotDuration = settings.slotDuration;
    this.interval = settings.interval;
    this.expireOffset = settings.expireOffset;
    this.cancelationNotice = settings.cancelationNotice;
    this.week = settings.week;
  }
}

async function createDefaultConfig() {
  const settings = await Settings.find();
  let last = moment().format("YYYY-MM-DD");
  last = moment(last).add(10, "day").unix();
  if (settings.length < 1) {
    const newSettings = new Settings({
      lastBookableDay: last,
      slotDuration: 50,
      interval: 10,
      expireOffset: 60,
      cancelationNotice: 24,
      week: [...new Array(7)].map(() =>
        ({ startHours: 10, startMinutes: 0, slotNumber: 5, off: false }))
    });
    await newSettings.save();
  }
}

module.exports = Config;

我还有其他可以毫无问题地访问数据库的测试。

这是失败测试的代码（为简单起见，没有清理数据库）：

const Settings = require("./settings.js");

describe("Settings class", () => {

  it("should init settings instance", async () => {

    const settings = new Settings();
    await settings.init();

    console.log(settings)
    expect(settings.slotDuration).toBe(50);
  })

});

谁能指出我做错了什么？谢谢。

Answer 1

您的 Config 类看起来很奇怪，它正在从 ./settings.js 导入 Settings，但它没有创建它的实例或初始化它。

如果没有看到所有代码，很难看到上下文，但你的配置类不应该是这样的：

const { Settings } = require("../models/settings");
const moment = require("moment");

class Config {

  async init() {
    const settingsTool = new Settings();
    await settingsTool.init();

    let settings = await settingsTool.findOne(); // This looks like the line where it gets stuck
    if (!settings) settings = await createDefaultConfig();

    this.lastBookableDay = settings.lastBookableDay;
    this.slotDuration = settings.slotDuration;
    this.interval = settings.interval;
    this.expireOffset = settings.expireOffset;
    this.cancelationNotice = settings.cancelationNotice;
    this.week = settings.week;
  }
}