模拟router.events.subscribe()Angular2

在我的app.component.ts中,我有以下ngOnInit函数:

ngOnInit() {
    this.sub = this.router.events.subscribe(e => {
      if (e instanceof NavigationEnd) {
        if (!e.url.includes('login')) {
          this.loggedIn = true;
        } else {
          this.loggedIn = false;
        }
      }
    });
  }

目前我正在测试sub是否为null但我想测试100%覆盖率的函数.

我想模拟路由器对象,以便我可以模拟URL,然后测试是否正确设置了this.loggedIn.

我将如何进行模拟此功能？我尝试了但是我不知道如何通过涉及的回调和NavigationEnd来实现这一点.

我找到了答案,如果有人正在寻找它:

import {
  addProviders,
  async,
  inject,
  TestComponentBuilder,
  ComponentFixture,
  fakeAsync,
  tick
} from '@angular/core/testing';
import { AppComponent } from './app.component';
import { Router, ROUTER_DIRECTIVES, NavigationEnd } from '@angular/router';
import { HTTP_PROVIDERS } from '@angular/http';
import { LocalStorage, WEB_STORAGE_PROVIDERS } from 'h5webstorage';
import { NavComponent } from '../nav/nav.component';
import { FooterComponent } from '../footer/footer.component';
import { Observable } from 'rxjs/Observable';

class MockRouter {
  public ne = new NavigationEnd(0, 'http://localhost:4200/login', 'http://localhost:4200/login');
  public events = new Observable(observer => {
    observer.next(this.ne);
    observer.complete();
  });
}

class MockRouterNoLogin {
  public ne = new NavigationEnd(0, 'http://localhost:4200/dashboard', 'http://localhost:4200/dashboard');
  public events = new Observable(observer => {
    observer.next(this.ne);
    observer.complete();
  });
}

我从Angular docs创建了一个版本的路由器存根,它使用这个方法来实现NavigationEnd事件以进行测试:

import {Injectable} from '@angular/core';
import { NavigationEnd } from '@angular/router';
import {Subject} from "rxjs";

@Injectable()
export class RouterStub {
  public url;
  private subject = new Subject();
  public events = this.subject.asObservable();

  navigate(url: string) {
    this.url = url;
    this.triggerNavEvents(url);
  }

  triggerNavEvents(url) {
    let ne = new NavigationEnd(0, url, null);
    this.subject.next(ne);
  }
}

public ne = new NavigationEnd(0, 'http://localhost:4200/login', 'http://localhost:4200/login');
  public events = new Observable(observer => {
    observer.next(this.ne);
    observer.complete();
  });

public events = Observable.of( new NavigationEnd(0, 'http://localhost:4200/login', 'http://localhost:4200/login'));

import { NO_ERRORS_SCHEMA } from '@angular/core';
import {
  async,
  TestBed,
  ComponentFixture
} from '@angular/core/testing';

/**
 * Load the implementations that should be tested
 */
import { AppComponent } from './app.component';

import { NavigationEnd, Router } from '@angular/router';
import { Observable } from 'rxjs/Observable';


class MockServices {
  // Router
  public events = Observable.of( new NavigationEnd(0, 'http://localhost:4200/login', 'http://localhost:4200/login'));
}

describe(`App`, () => {
  let comp: AppComponent;
  let fixture: ComponentFixture;
  let router: Router;

  /**
   * async beforeEach
   */
  beforeEach(async(() => {
    TestBed.configureTestingModule({
      declarations: [ AppComponent ],
      schemas: [NO_ERRORS_SCHEMA],
      providers: [
        { provide: Router, useClass: MockServices },
      ]
    })
    /**
     * Compile template and css
     */
    .compileComponents();
  }));

  /**
   * Synchronous beforeEach
   */
  beforeEach(() => {
    fixture = TestBed.createComponent(AppComponent);
    comp    = fixture.componentInstance;

    router = fixture.debugElement.injector.get( Router);

    /**
     * Trigger initial data binding
     */
    fixture.detectChanges();
  });

  it(`should be readly initialized`, () => {
    expect(fixture).toBeDefined();
    expect(comp).toBeDefined();
  });

  it('ngOnInit() - test that this.loggedIn is initialised correctly', () => {
    expect(comp.loggedIn).toEqual(true);
  });

});