Javascript 如何模拟正在测试的函数中调用的函数?
我有一个寄存器功能,可以将我的用户保存到mongoose DB。在测试时,我不希望用户实际保存到数据库中,因此我希望覆盖mongoose保存方法 我的注册方法如下:Javascript 如何模拟正在测试的函数中调用的函数?,javascript,node.js,unit-testing,mongoose,jestjs,Javascript,Node.js,Unit Testing,Mongoose,Jestjs,我有一个寄存器功能,可以将我的用户保存到mongoose DB。在测试时,我不希望用户实际保存到数据库中,因此我希望覆盖mongoose保存方法 我的注册方法如下: async register({firstName, lastName, email, password}){ try { const salt = bcrypt.genSaltSync(10); const hash = bcrypt.hashSync(password, salt);
async register({firstName, lastName, email, password}){
try {
const salt = bcrypt.genSaltSync(10);
const hash = bcrypt.hashSync(password, salt);
return await new UserModel({
firstName,
lastName,
email,
hash
}).save()
}catch (err) {
console.log(`Unable to register new user: ${err}`)
throw 'Unable to register new user'
}
}
所以我想测试一下这个方法。我已经编写了测试,但我不知道如何将模拟函数传递到我的register()
函数中
import UserConnector from './user'
import sinon from 'sinon'
import mongoose from 'mongoose'
import UserModel from '../../models/user'
describe("User connector", () => {
it("should register user", () => {
const expectedUser = {
firstName: "adsfja",
lastName: "adsfja",
email: "adsfja@alsda.com",
password: "password123"
}
var myStub = sinon.stub(UserModel.prototype, 'save').withArgs(expectedUser) // <--- How can I pass this into my userConnector.register() method so that the stub is called instead of the real thing
const user = new UserConnector().register(expectedUser)
expect(user).toEqual({
firstName: "adsfja",
lastName: "adsfja",
email: "adsfja@alsda.com"
})
})
})
从“./user”导入UserConnector
从“sinon”导入sinon
从“猫鼬”导入猫鼬
从“../../models/user”导入UserModel
描述(“用户连接器”,()=>{
它(“应该注册用户”,()=>{
常数预期值={
名字:“adsfja”,
姓氏:“adsfja”,
电子邮件:“adsfja@alsda.com",
密码:“password123”
}
var myStub=sinon.stub(UserModel.prototype,“save”)。使用args(expectedUser)/根据,实现这一点的方法是使用callsFake
见下面的例子
import UserConnector from './user'
import sinon from 'sinon'
import mongoose from 'mongoose'
import UserModel from '../../models/user'
describe("User connector", () => {
it("should register user", async () => {
const expectedUser = {
firstName: "adsfja",
lastName: "adsfja",
email: "adsfja@alsda.com",
password: "password123"
}
var myStub = sinon
.stub(UserModel.prototype, 'save')
.callsFake(() => Promise.resolve(expectedUser))
const userConnector = new UserConnector();
// since register is used as async, we should expect it to return a promise
const user = await userConnector.register(expectedUser)
expect(user).toEqual({
firstName: "adsfja",
lastName: "adsfja",
email: "adsfja@alsda.com"
})
myStub.restore() // don't forget to restore stubbed function
})
})
希望这有帮助我想您的函数寄存器不应该硬编码依赖项,因此,您可以创建一个类/闭包(或者不创建,只需将适当的数据传递到函数中)在构造函数/闭包函数中输入依赖项,这样您就可以输入测试依赖项来使用存根函数tryvar myStub=sinon.stub(UserModel.prototype,'save')。callsFake(()=>expectedUser)
&让我知道您是怎么做的:)还要注意,寄存器是异步的,所以最好使用const userConnector=new userConnector();const user=wait userConnector.register(expectedUser)
在这里尝试一下