angular2中的单元测试，依赖注入

Question

在 Angular 1 上花费时间之后，从 Angular 2 开始。没有进行如此多的单元测试，因为它更像是一个附带项目的东西，我正在尝试至少开始OK...我从 @987654321 的示例开始@如果这有影响的话。

已经在app.component.ts 中挣扎，其中包含我的导航位。模板的相关部分在这里：

<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> 

组件本身包含的内容不多：

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、组件和路由都通过 App 模块引导。有需要可以发帖。

我必须为它编写的测试让我基本上连接了路由器上的所有东西（看起来如此）。首先，[routerLink] is not a native attribute of 'a'。好的，我修复它。那么：

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

于是，我挂了路由器，才发现：

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

我添加的内容是：

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

现在，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);
        });
    }));
});

我已经在模拟输入，这对我来说似乎是错误的。我错过了什么吗？有没有一种更聪明的方式来加载整个应用程序进行测试，而不是一直在每个单独的依赖项中进行螺栓连接？

Answer 1

对于测试，您应该使用RouterTestingModule 而不是RouterModule。如果要添加路线，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 用于模拟 ActivatedRoute 的想法。有时在单元测试时你不想要整个路由工具。您可以模拟路线。