[英]How to spyOn a function that is not part of the class under test with Jest and Typescript
I'm trying to spy on a function that come from uuidv4 package but I didn't figure out how to do that.我正在尝试监视来自 uuidv4 package 的 function,但我不知道该怎么做。
This is my User Class:这是我的用户 Class:
import { uuid } from 'uuidv4';
import { IUser } from '../interfaces/IUser';
export class User implements IUser {
constructor(
public name: string,
public email: string,
public password: string,
public id?: string,
) {
this.id = id ? id : uuid();
}
}
What I'm trying to do is spy on that uuid() method that is called on the constructor of the User.ts.我想做的是监视在 User.ts 的构造函数上调用的 uuid() 方法。 I tried something like this:
我试过这样的事情:
import { User } from './User';
describe('User', () => {
it('should call uuid() when no id is provided', () => {
const sut = new User('Foo', 'foo@bar.com', '12345');
const spy = jest.spyOn(sut, 'uuid');
expect(spy).toHaveBeenCalledTimes(1);
});
});
But it didn't work.但它没有用。 Anyone knows how could I do this?
任何人都知道我怎么能这样做?
You don't need to mock or install spy on the uuid
to test the implementation detail.您不需要在
uuid
上模拟或安装 spy 来测试实现细节。 You can test the with Using a regular expression to check user.id
is a UUID v4 or not.您可以使用正则表达式来测试
user.id
是否为 UUID v4。
Using a regular expression:使用正则表达式:
If you want to perform the verification on your own using a regular expression, use the regex property, and access its v4 or v5 property
如果您想使用正则表达式自行执行验证,请使用 regex 属性,并访问其 v4 或 v5 属性
index.ts
: index.ts
:
import { uuid } from 'uuidv4';
interface IUser {
id?: string;
}
export class User implements IUser {
constructor(public name: string, public email: string, public password: string, public id?: string) {
this.id = id ? id : uuid();
}
}
index.test.ts
: index.test.ts
:
import { User } from './';
import { regex } from 'uuidv4';
describe('User', () => {
it('should call uuid() when no id is provided', () => {
const user = new User('Foo', 'foo@bar.com', '12345');
expect(regex.v4.test(user.id!)).toBeTruthy();
});
});
PASS stackoverflow/72130740/index.test.ts (13.885 s)
User
✓ should call uuid() when no id is provided (2 ms)
Test Suites: 1 passed, 1 total
Tests: 1 passed, 1 total
Snapshots: 0 total
Time: 16.53 s
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.