Angular2 2.0.0组件单元测试导致错误:在注入路由器之前至少引导一个组件

Question

看看以前类似的问题，似乎从来没有一个明确的答案。

是这样的。我正在使用angular-cli工具构建一个angular2应用程序(运行beta 16)，使用angular 2.0.1和router 3.0.1。

当我运行"ng test"时，除了我的app.component，所有的测试都通过了。(ng server工作正常等)

下面是一些代码:

app.module.ts

import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { Routes, RouterModule } from '@angular/router';
import { FormsModule } from '@angular/forms';
import { HttpModule } from '@angular/http';
import { AppComponent } from './app.component';
import { HomeComponent } from './home/home.component';
import { HealthComponent } from './health/health.component';
import { MonitorModule } from './monitor/monitor.module';
import { PlanComponent } from './plan/plan.component';
import { ConfigureComponent } from './configure/configure.component';
import { DashboardComponent } from './dashboard/dashboard.component';
import { TroubleshootComponent } from './troubleshoot/troubleshoot.component';
import { HeaderComponent } from './ui/header/header.component';
import { OnboardingModule } from './onboarding/onboarding.module';
import { routing, appRoutingProviders }  from './app.routing';
@NgModule({
  imports: [
    BrowserModule,
    FormsModule,
    HttpModule,
    routing,
    MonitorModule,
    OnboardingModule
  ],
  declarations: [
    AppComponent,
    HomeComponent,
    HealthComponent,
    PlanComponent,
    ConfigureComponent,
    DashboardComponent,
    TroubleshootComponent,
    HeaderComponent
  ],
  providers: [
    appRoutingProviders
  ],
  bootstrap: [AppComponent]
})
export class AppModule {
}

app.component.ts

import { Component, OnInit } from '@angular/core';
@Component({
  selector: 'app-root',
  templateUrl: './app.component.html'
})
export class AppComponent  {
}

app.component.spec.ts

/* tslint:disable:no-unused-variable */
import { TestBed, async } from '@angular/core/testing';
import { APP_BASE_HREF } from '@angular/common';
import { routing, appRoutingProviders }  from './app.routing';
import { AppComponent } from './app.component';
import { HomeComponent } from './home/home.component';
import { HeaderComponent } from './ui/header/header.component';
import { HealthComponent } from './health/health.component';
import { PlanComponent } from './plan/plan.component';
import { ConfigureComponent } from './configure/configure.component';
import { DashboardComponent } from './dashboard/dashboard.component';
import { TroubleshootComponent } from './troubleshoot/troubleshoot.component';
describe('App: Ng2Test2', () => {
  beforeEach(() => {
    TestBed.configureTestingModule({
      declarations: [
        AppComponent,
        HeaderComponent,
        HomeComponent,
        HealthComponent,
        PlanComponent,
        ConfigureComponent,
        DashboardComponent,
        TroubleshootComponent
      ],
      imports: [
        routing
      ],
      providers: [
        appRoutingProviders,
        { provide: APP_BASE_HREF, useValue : '/' }
      ]
    });
  });
  it('should create the app', async(() => {
    let fixture = TestBed.createComponent(AppComponent);
    let app = fixture.debugElement.componentInstance;
    expect(app).toBeTruthy();
  }));
});

app.component.html

  <app-header></app-header>
  <router-outlet></router-outlet>

最后，这是我得到的错误，当我运行"ng test":

App: Ng2Test2 should create the app FAILED
    Failed: Error in ./AppComponent class AppComponent - inline template:2:2 caused by: Bootstrap at least one component before injecting Router.
    Error: Bootstrap at least one component before injecting Router.
        at setupRouter (webpack:///Users/jtaylor/Projects/hmng-angular/hmng-ng2/~/@angular/router/src/router_module.js:190:0 <- src/test.ts:29132:15)

我已经尝试了很多不同的事情来防止这个错误，但不能让这个停止射击!

对此有什么想法吗?

编辑:我跟踪到这个组件，我在我的构造函数中使用路由器:

header.component.ts

import { Component, OnInit } from '@angular/core';
import { Router, ActivatedRoute, NavigationEnd } from '@angular/router';
import { AppComponent } from '../../app.component';
@Component({
  selector: 'app-header',
  templateUrl: './header.component.html'
})
export class HeaderComponent implements OnInit {
  section: any;
  // router: Router;
  // activateRoute: ActivatedRoute;
  constructor(
    public router: Router,
    public activatedRoute: ActivatedRoute
  ) {}
  ngOnInit() {
    this.router.events.subscribe(e => {
      if (e instanceof NavigationEnd) {
        this.setActiveNavTab(e.url.replace(/^/([^/]*).*$/, '$1'));
      }
    });
  }
  setActiveNavTab(section: string) {
    this.section = section;
  }
}

那么，我如何在构造函数之前用单元测试引导组件呢?

Answer 1

这是因为您试图使用RouterModule进行测试。相反，您应该使用RouterTestingModule并使用RouterTestingModule.withRoutes

添加路由。

import { RouterTestingModule } from '@angular/router/testing';
imports: [
  // routing
  RouterTestingModule.withRoutes(APP_ROUTES)
]