unit-testing - angular2中的单元测试，依赖注入(inject)

Question

在使用 Angular 1 后开始使用 Angular 2。没有进行单元测试，因为它更像是一个副项目，我正在尝试至少开始 OK...我从 AngularClass 的示例开始，如果这很重要。

已经在 app.component.ts 中苦苦挣扎，其中包含我的导航位。此处模板的相关部分:

<nav class="navbar navbar-light bg-faded">
  <div class="container">
    <div class="nav navbar-nav">
      <a class="navbar-brand" [routerLink]=" ['./'] ">Navbar</a>
      <loading class="nav-item nav-link pull-xs-right" [visible]="user === null"></loading>
  </div>
</div>
</nav>

<div class="container">
  <main>
    <router-outlet></router-outlet>
</main>
</div>

<footer>
  <hr>
  <div class="container">

</div>
</footer> 

组件本身并不包含太多:

import { Component, ViewEncapsulation } from '@angular/core';
import { AuthService } from './_services';
import { User } from './_models';
import { Loading } from './_components';

@Component({
    selector: 'app',
    encapsulation: ViewEncapsulation.None,
    template: require('./app.component.html'),
    styles: [
        require('./app.style.css')
    ]
})
export class App {
    user: User;

    constructor(private auth: AuthService) {

    }

    ngOnInit() {
        this.auth.getUser().subscribe(user =>  this.user = user);
    }
}

所有模块、组件和路由都是通过 App 模块引导的。需要的可以发帖。

我必须为其编写的测试让我基本上连接了路由器的所有内容(看起来如此)。首先，[routerLink] 不是“a”的原生属性。好的，我修复它。然后:

Error in ./App class App - inline template:3:6 caused by: No provider for Router!

所以，我连接路由器，却发现:

Error in ./App class App - inline template:3:6 caused by: No provider for ActivatedRoute!

我添加的是:

Error in ./App class App - inline template:3:6 caused by: No provider for LocationStrategy!

到目前为止，测试看起来像:

import { inject, TestBed, async } from '@angular/core/testing';
import { AuthService } from './_services';
import { Router, RouterModule, ActivatedRoute } from '@angular/router';
import { AppModule } from './app.module';

// Load the implementations that should be tested
import { App } from './app.component';
import { Loading } from './_components';

describe('App', () => {
    // provide our implementations or mocks to the dependency injector
    beforeEach(() => TestBed.configureTestingModule({
        declarations: [App, Loading],
        imports: [RouterModule],
        providers: [
            {
                provide: Router,
                useClass: class {
                    navigate = jasmine.createSpy("navigate");
                }
            }, {
                provide: AuthService,
                useClass: class {
                    getAccount = jasmine.createSpy("getAccount");
                    isLoggedIn = jasmine.createSpy("isLoggedIn");
                }
            }, {
                provide: ActivatedRoute,
                useClass: class { }
            }
        ]
    }));

    it('should exist', async(() => {

        TestBed.compileComponents().then(() => {
            const fixture = TestBed.createComponent(App);

            // Access the dependency injected component instance
            const controller = fixture.componentInstance;

            expect(!!controller).toBe(true);
        });
    }));
});

我已经在 mock 输入了，这对我来说似乎是错误的。我错过了什么吗？有没有一种更智能的方法可以在测试中加载整个应用程序，而不是始终绑定(bind)每个依赖项？

Answer 1

为了测试，您应该使用 RouterTestingModule而不是 RouterModule。如果你想添加路由，你可以使用 withRoutes

imports: [
  RouterTestingModule.withRoutes(Routes) // same any normal route config
]

另见

• Angular 2 unit testing components with routerLink
• Second half of this post模拟 ActivatedRoute 的想法。有时您在单元测试时不需要整个路由设施。您可以模拟路线。