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[英]TypeError: Cannot read properties of undefined (reading 'createdTimestamp')
[英]TypeError: Cannot read properties of undefined (reading 'and')
请帮忙! 尝试运行浅集成测试时,我得到了上面的类型错误。
我多次查看我的代码以检查我是否有问题,但一切似乎都已就位。
我正在努力让这个测试通过。
expect(fixture.componentInstance.heroes.length).toBe(3)
它在 Karma 中因此错误而不断失败。
类型错误:无法读取未定义的属性(读取“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)
});
});
我不确定您使用的是什么单元测试框架:
你的线路在这里
mockHeroService.getHeroes.and.returnValue(of(HEROES))
通过错误,我可以看出编译器正在尝试读取属性and
对象mockHeroService.getHeroes
。 and()
应该是一个断言的函数
它应该是:
mockHeroService.getHeroes.and().returnValue(of(HEROES))
mockHeroService 方法中的引号未正确放置。
mockHeroService = jasmine.createSpyObj(['getHeroes, addHero, deleteHero']);
应该是这个。
mockHeroService = jasmine.createSpyObj(['getHeroes', 'addHero', 'deleteHero']);
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