茉莉花测试用例无法解析src文件夹上方的模块

Question

我正在测试的组件之一是导入位于/src文件夹外部的常量文件。运行测试时，component.ts文件中有一个错误，指出常量对象未定义。以下是详细信息。任何帮助都会非常有帮助。预先感谢。

这是我运行ng test时遇到的错误。

错误：

TypeError：无法读取未定义的属性“ ROUTE_SERVICE_USER”         在WelcomeComponent ../ src / app / welcome / welcome.component.ts.WelcomeComponent.ngOnInit（http://localhost:9876/src/app/welcome/welcome.component.ts?:24:30）

文件夹结构：

AppConstants.js：

    const AppConstants = {

    HEADER_LANG: 'Content-Language',
    HEADER_LANG_LOWER: 'content-language',


    ROUT_WELCOME: '/welcome',
    ROUT_NEWUSER: '/newuser',

    ROUTE_SERVICE_USER: '/service/user/registered',
    };


    module.exports = AppConstants;

Welcome.component.ts：

  import { Component, OnInit } from '@angular/core';
  import AppConstants from '../../../common/AppConstants.js';

  @Component({
    selector: 'app-welcome',
    templateUrl: './welcome.component.html',
    styleUrls: ['./welcome.component.css']
  })
  export class WelcomeComponent implements OnInit {

    constructor() {

    }

    ngOnInit() {
      console.log(AppConstants.ROUTE_SERVICE_USER);
    }

  }

Welcome.component.spec.ts：

import { async, ComponentFixture, TestBed } from '@angular/core/testing';

import { WelcomeComponent } from './welcome.component';

describe('WelcomeComponent', () => {
  let component: WelcomeComponent;
  let fixture: ComponentFixture<WelcomeComponent>;

  beforeEach(async(() => {
    TestBed.configureTestingModule({
      declarations: [ WelcomeComponent ]
    })
    .compileComponents();
  }));

  beforeEach(() => {
    fixture = TestBed.createComponent(WelcomeComponent);
    component = fixture.componentInstance;
    fixture.detectChanges();
  });

  it('should create', () => {
    expect(component).toBeTruthy();
  });
});