![](/img/trans.png)
[英]TypeError: Cannot read properties of undefined (reading 'createdTimestamp')
[英]TypeError: Cannot read properties of undefined (reading 'and')
請幫忙! 嘗試運行淺集成測試時,我得到了上面的類型錯誤。
我多次查看我的代碼以檢查我是否有問題,但一切似乎都已就位。
我正在努力讓這個測試通過。
expect(fixture.componentInstance.heroes.length).toBe(3)
它在 Karma 中因此錯誤而不斷失敗。
類型錯誤:無法讀取未定義的屬性(讀取“和”)
import { ComponentFixture, TestBed } from "@angular/core/testing"
import { of } from "rxjs";
import { HeroService } from "../hero.service";
import { HeroesComponent } from "./heroes.component"
describe('HeroesComponent (shallow tests)', () => {
let fixture: ComponentFixture<HeroesComponent>;
let mockHeroService;
let HEROES;
beforeEach(() =>{
HEROES = [
{id:1, name: 'SpiderDude', strength: 8},
{id:2, name: 'Wonderful Woman', strength: 24},
{id:3, name: 'SuperDude', strength: 55}
];
mockHeroService = jasmine.createSpyObj(['getHeroes, addHero, deleteHero']);
TestBed.configureTestingModule({
declarations: [HeroesComponent],
providers: [
{ provide: HeroService, useValue: mockHeroService}
],
schemas: [NO_ERRORS_SCHEMA]
})
fixture = TestBed.createComponent(HeroesComponent)
})
it('should set heroes correctly from the service', () => {
mockHeroService.getHeroes.and.returnValue(of(HEROES))
fixture.detectChanges();
expect(fixture.componentInstance.heroes.length).toBe(3)
});
});
我不確定您使用的是什么單元測試框架:
你的線路在這里
mockHeroService.getHeroes.and.returnValue(of(HEROES))
通過錯誤,我可以看出編譯器正在嘗試讀取屬性and
對象mockHeroService.getHeroes
。 and()
應該是一個斷言的函數
它應該是:
mockHeroService.getHeroes.and().returnValue(of(HEROES))
mockHeroService 方法中的引號未正確放置。
mockHeroService = jasmine.createSpyObj(['getHeroes, addHero, deleteHero']);
應該是這個。
mockHeroService = jasmine.createSpyObj(['getHeroes', 'addHero', 'deleteHero']);
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.