使用 Angular 2 模拟组件

Question

我试图模拟'Tour of Heroes' Angular 2 Tutorial 的英雄组件。但我不知道如何模拟路由器，这是实例化 HeroesComponent 所必需的。我尝试使用 Jasmine 创建一个 Spy，但这不起作用，因为它缺少属性“RootComponentType”。

我怎样才能做到这一点？

import {HeroesComponent} from "./heroes.component";
import {Router} from "@angular/router-deprecated";
import {HeroService} from "./hero.service";


describe('HeroesComponent', () => {
    let heroes:HeroesComponent;
    let router:Router;
    let service:HeroService;
    beforeEach(() => {
        router = jasmine.createSpyObj('Router', ['navigate']);
        service = new HeroService(/* I will care about this later */);
        heroes = new HeroesComponent(router, service);
    });
    it('should be defined', () => {
        expect(heroes).toBeDefined();
    });
});

它正在工作：

describe('HeroesComponent', () => {
    let router:any;
    let heroesComponent:HeroesComponent;
    let service:HeroService;

    beforeEach(() => {
        router = new class {
            navigate = jasmine.createSpy("navigate");
        };
        heroesComponent = new HeroesComponent(router, service);
    });
    it('should be defined', () => {
        expect(heroesComponent).toBeDefined();
    });
});

Answer 1

您可以直接在导航方法上创建间谍。

1. 为 DI 使用 addProviders：

   beforeEach(() => addProviders([
   { 
       provide: Router, 
       useClass: class { navigate = jasmine.createSpy("navigate"); }
   }]));
   

2. 对于组件的直接初始化：

   let router;
   let heroesComponent;
   
   beforeEach(() => {
       router = new class { navigate = jasmine.createSpy("navigate"); };
       heroesComponent = new HeroesComponent(router);
   });