如何将6+服务变量注入应用程序-路由.模块.规范.ts和测试路由器重定向

我试图测试一个用户是否被成功重定向,如果 authenticated 变量设置为true。

我试着把我的登录服务注入 beforeEach 设置 变量为false。然后,在单元测试中,将该变量设置为true。然后我希望我的警卫会发现 已验证 设置为true,然后重定向到仪表板页面。

应用程序路由-模块规范ts:

import { LoginService } from './services/login.service';
import { Router } from "@angular/router";
import { RouterTestingModule } from '@angular/router/testing';
import { Location } from "@angular/common";
import { routes } from "./app-routing.module";
import { AppComponent } from './components/app.component';


describe('AppRoutingModule, () => {
      let location: Location;
      let router: Router;

  beforeEach(() => {
      TestBed.configureTestingModule({
          declarations: [AppComponent],
          providers: [LoginService]
      })

      router = TestBed.get(Router);
      location = TestBed.get(Location);
      fixture = TestBed.createComponent(AppComponent);
      router.initialNavigation();
  });

  beforeEach(inject([LoginService], (loginService: LoginService) => {
    loginService.authenticated = false;
  }))

  it('should redirect the user form the LoginComponent to the DashboardComponent if the user is already logged in', inject([LoginService](loginService: LoginService) => {
    loginService.authenticated = true;
    console.log(loginService);
    router.navigate([""]).then(() => {
      expect(location.path()).toBe("/dashboard");
    });
  }))
})

import { Injectable } from '@angular/core';
import { Router, CanActivate, ActivatedRouteSnapshot, RouterStateSnapshot } from '@angular/router';
import { LoginService } from '../services/login.service';
import { Observable } from 'rxjs/index';


@Injectable({
  providedIn: 'root'
})
export class LoginGuard implements CanActivate {

  constructor(private router: Router, private loginService: LoginService) { 
}

  canActivate(
    next: ActivatedRouteSnapshot,
    state: RouterStateSnapshot): Observable<boolean> | Promise<boolean> | boolean {
    console.log('checked authenticated guard');
    if (this.loginService.authenticated === true) {
      this.loginService.navigationState.next(true);
      return true;
    } else {
      this.router.navigate(['']);
      return false;
    }
  }
}

登录.service.ts:

public authenticated = false;

export const routes: Routes = [
  { path: '', component: LoginComponent },
  { path: 'dashboard', component: CurrentActivityComponent, canActivate: [LoginGuard] }
]

我希望测试能够通过,将用户重定向到“dashboard”,但失败的原因是: Expected '/' to be '/dashboard'.