Angular 如果服务有构造函数，Jest 服务测试将失败

Question

Angular test fail when i try to test service that contains contructor. No matter if constructor has dependencies or it's empty.

Hi, I have an issue with testing angular app using jest. When I try to test my service i receive error:

 <dirToProject>\src\app\core\services\simple.service.ts:8
        static { this.ctorParameters = () => []; }
               ^

    SyntaxError: Unexpected token '{'

    > 1 | import { SimpleService } from './simple.service';
        | ^
      2 | import { TestBed } from '@angular/core/testing';
      3 |
      4 | describe('SimpleService', () => {

      at Runtime.createScriptFromCode (node_modules/jest-runtime/build/index.js:1495:14)
      at Object.<anonymous> (src/app/core/services/simple.service.spec.ts:1:1)

Simple service:

import { Injectable } from '@angular/core';

@Injectable({
  providedIn: 'root'
})
export class SimpleService {

  constructor() { }
}

Test:

import { SimpleService } from './simple.service';
import { TestBed } from '@angular/core/testing';

describe('SimpleService', () => {
  let service: SimpleService;

  beforeEach(() => {
    TestBed.configureTestingModule({});
    service = new SimpleService();
  });

  it('should be created', () => {
    expect(service).toBeTruthy();
  });
});

Surprisingly this error disappear when i delete constructor from service. Of course in this example I can remove contructor, but I have to test more complex services with dependencies.

Do you have any ideas how to solve this? Versions: "jest": "^29.5.0", "@angular/core": "^15.2.0"

Answer 1

@Alokin try setting up the tsconfig.ts or tsconfig.spec.ts "target": "ES2020"