如何用笑话模拟函数.save()的顺序

Question

我想用jest模拟sequelize中的函数.save((。但我在user.services.test.js文件中发现了一个代码错误。有人能帮我吗？

错误说：result.save((不是函数。

user.services.test.js

it('Should update user that input by ', async () => {
let result;
let data ;
let dataInput =  {id : 1, username : "teguh", userPassword : "apake"};        
user.findByPk = jest.fn(() => {
return {username : "teguh", userPassword : "iyah", save : mockFuntion()};
});
data = user.findByPk();
data.userPassword = dataInput.userPassword;
data.save = jest.fn(() => {return {saved:true}});
result = await service.updateUser(dataInput);
expect(data.save).toBeCalledTimes(1);
expect(data.userPassword).toEqual(dataInput.userPassword);
});

user.services.js

async updateUser(user){
let result;
try {
const pass = bcrypt.hashSync(user.userPassword, 9);
// result = await this.user.update({userPassword : pass}, {
//     where : {username : user.username}
// });
result = await this.user.findByPk(user.id);
if(result) {
result.userPassword = pass;
result.save();
return result;
}
} catch (e) {
logEvent.emit('APP_ERROR', {
logTitle : '[UPDATE-USER-FAILED]',
logMessage : e
});
throw new Error(e);
}
}

Answer 1

下面是一个工作示例：

user.services.ts:

import bcrypt from 'bcrypt';
const logEvent = { emit(event, payload) {} };
class UserService {
user;
constructor(user) {
this.user = user;
}
async updateUser(user) {
let result;
try {
const pass = bcrypt.hashSync(user.userPassword, 9);
result = await this.user.findByPk(user.id);
if (result) {
result.userPassword = pass;
await result.save();
return result;
}
} catch (e) {
logEvent.emit('APP_ERROR', {
logTitle: '[UPDATE-USER-FAILED]',
logMessage: e,
});
throw new Error(e);
}
}
}
export { UserService };

user.services.test.ts:

import { UserService } from './user.services';
describe('60468548', () => {
it('should update user that input by', async () => {
const dataInput = { id: 1, username: 'teguh', userPassword: 'apake' };
const userModelInstanceMock = { save: jest.fn() };
const userModelMock = { findByPk: jest.fn().mockResolvedValueOnce(userModelInstanceMock) };
const userService = new UserService(userModelMock);
const actual = await userService.updateUser(dataInput);
expect(userModelMock.findByPk).toBeCalledWith(1);
expect(userModelInstanceMock.save).toBeCalledTimes(1);
});
});

带覆盖率报告的单元测试结果：

PASS  src/examples/stackoverflow/60468548/user.services.test.ts
60468548
✓ should update user that input by (36ms)
------------------|----------|----------|----------|----------|-------------------|
File              |  % Stmts | % Branch |  % Funcs |  % Lines | Uncovered Line #s |
------------------|----------|----------|----------|----------|-------------------|
All files         |    84.62 |       50 |    66.67 |    84.62 |                   |
user.services.ts |    84.62 |       50 |    66.67 |    84.62 |             22,27 |
------------------|----------|----------|----------|----------|-------------------|
Test Suites: 1 passed, 1 total
Tests:       1 passed, 1 total
Snapshots:   0 total
Time:        2.78s