用Jest模拟nodemailer

如何解决用Jest模拟nodemailer

我设置了一个端点，该端点允许用户重置密码。一切正常，并且测试都通过了，直到我添加了nodemailer并添加了向用户发送电子邮件的行。

我正在使用Jest进行测试。

如果我注释掉测试通过的发送电子邮件的行，则currencyList : string[] = []; ngOnInit() { //form controls are initialized this.handleCurrency(); } handleCurrency(){ if(!this.formgroup.get('requestCurrency').value){ this.currencyService.fecthCurrencies().subscribe( (data) => { this.currencyList = data; this.defaultAndDisableCurrency(); },() => { //in case API call fails this.currencyList.push("EUR"); this.defaultAndDisableCurrency(); }); } //this.defaultAndDisableCurrency(); I would like to call the function here after API call is complete but this line gets executed without waiting for the call to complete } defaultAndDisableCurrency(){ let cur: any = this.formgroup.get('requestCurrency'); cur.valueChanges.subscribe((data)=>{ if(data === "EUR"){ cur.disable(); } }); cur.setValue(this.currencyList[0]); } 如果我保留该行-测试失败。我已经通过REST客户端确认一切正常，这使我相信测试是问题所在。

ReferenceError：Jest环境被拆除后，您正在尝试导入文件。

mailer.sendPasswordResetEmail(body.email,token);

我认为我没有正确嘲笑nodemailer-是否有人有使用nodemailer和开玩笑的经验？还是有更好的方法

有问题的文件是test("if a valid user requests a password change,they should be assigned a hash",async () => { const userBefore = await helper.getUser(); expect(userBefore.passwordResetHash).toBe(""); await api .post("/api/reset-password") .send({ email: userBefore.email }) .expect(200); const userAfter = await helper.getUser(); expect(userAfter.passwordResetHash).not.toBeNull(); }); ，controllers/resetPassword.js和utils/mailer.js。

controllers / resetPassword.js

tests/resetPassword.test.js

utils / mailer.js

resetPasswordRouter.post("/",async (request,response) => {
  // get email from request
  const { body } = request;

  // get the user with matching email
  const user = await User.findOne({ email: body.email });

  // if not found return error
  if (!user) {
    return response.status(400).json({ error: "User not found" });
  }

  // if user generate a token
  const token = helper.generateToken();

  // create a new user object with the resetPasswordHash defined
  const update = {
    passwordResetHash: await bcrypt.hash(token,10),};

  // update user model with the password hash
  const updatedUser = await User.findByIdAndUpdate(user.id,update,{
    new: true,});

  mailer.sendPasswordResetEmail(body.email,token);

  // setup timer to reset password hash in 30 minutes
  setTimeout(async () => {
    await User.findByIdAndUpdate(
      user.id,{ passwordResetHash: "" },{ new: true }
    );
  },30000); // half hour

  // return the updated user with the hash set
  response.status(200).json(updatedUser);
});

您可以在这里找到存储库：https://github.com/gerrgg/gregpress

解决方法

您需要模拟函数mailer.sendPasswordResetEmail，以便当控制器调用它时，它实际上会调用您的模拟实现。

test("if a valid user requests a password change,they should be assigned a hash",async () => {
    const userBefore = await helper.getUser();

    expect(userBefore.passwordResetHash).toBe("");

    // Jest spy to intercept mailer.sendPasswordResetEmail call
    let spy = jest.spyOn(mailer,'sendPasswordResetEmail').mockImplementation(() => return true);

    await api
      .post("/api/reset-password")
      .send({ email: userBefore.email })
      .expect(200);

    const userAfter = await helper.getUser();

    expect(userAfter.passwordResetHash).not.toBeNull();
});