Angular router.navigate测试类型错误：无法读取属性'；根'；未定义的

我正在尝试为包含路由器的方法创建简单的测试。在内部导航，不幸的是，我认为我的导入中应该有RouterTestingModule。正因为如此，我正在导入RouterTestingModule，在提供程序中，我还可以监视和导航路由器。因此，我得到了这个错误，这可能是因为覆盖路由器

组件中的方法

onUserInfo() {
    this.router.navigate(['student/info']);
  }

规范文件为：

fdescribe('NavbarComponent', () => {
    let component: NavbarComponent;
    let fixture: ComponentFixture<NavbarComponent>;
    let appStore: Store<fromApp.State>
    const fakeUser = { username: '', password: '', role: 'PARENT' }
    let mockRouter;

    beforeEach(async(() => {
        mockRouter = {
            navigate: jasmine.createSpy('navigate')
          }

        TestBed.configureTestingModule({
            imports: [
                RouterTestingModule,
                SharedModule,
                AuthModule,
                MaterialModule,
                StoreModule.forRoot(reducers),
                EffectsModule.forRoot([AuthEffects, UserEffects])
            ],
            declarations: [
                AppComponent,
                WelcomeComponent,
                NavbarComponent,
                ProjectInfoComponent
            ],
            providers: [
                { provide: Router, useValue: mockRouter},

            ]
        }).compileComponents();

        appStore = TestBed.get(Store);
    }));

    beforeEach(() => {
        fixture = TestBed.createComponent(NavbarComponent);
        component = fixture.componentInstance;
        fixture.detectChanges();
    });
 it('test', fakeAsync(()=> {
        fixture.detectChanges();

        component.onUserInfo();
          expect(mockRouter.navigate).toHaveBeenCalledWith(['student/info']);

    }))

当我删除{provide:Router，useValue:mockRouter}时，我将得到

Expected spy navigate to have been called with [ [ 'student/info' ] ] but it was never called.

有什么解决办法吗？提前谢谢

编辑（解决方案）

fdescribe（'NavbarComponent'，（）=>{
let组件：NavbarComponent；
let夹具：组件夹具；
让应用商店：商店
const fakeUser={用户名：“”，密码：“”，角色：'PARENT'}
让路由器：路由器
beforeach（异步（（）=>{
TestBed.configureTestingModule({
进口：[
RouterTestingModule.带路由（routes），
共享模块，
AuthModule，
材料模块，
StoreModule.forRoot（减速器），
EffectsModule.forRoot（[AuthEffects，UserEffects]）
],
声明：[
应用组件，
欢迎光临，
导航组件，
投影信息组件
],
供应商：[
]
}).compileComponents（）；
appStore=TestBed.get（Store）；
路由器=测试台。获取（路由器）
}));
在每个之前（（）=>{
fixture=TestBed.createComponent（NavbarComponent）；
组件=fixture.componentInstance；
fixture.detectChanges（）；
});
它（'asd'，fakeAsync（（）=>{
fixture.detectChanges（）；
让navigateSpy=spyOn（路由器，'navigate'）；
onUserInfo（）；
期望（navigateSpy）。与（['student/info']）一起被调用；
}))
});

Expected spy navigate to have been called with [ [ 'student/info' ] ] but it was never called.

fdescribe('NavbarComponent', () => {
    let component: NavbarComponent;
    let fixture: ComponentFixture<NavbarComponent>;
    let appStore: Store<fromApp.State>
    const fakeUser = { username: '', password: '', role: 'PARENT' }
    let router: Router

    beforeEach(async(() => {
        TestBed.configureTestingModule({
            imports: [
                RouterTestingModule.withRoutes(routes),
                SharedModule,
                AuthModule,
                MaterialModule,
                StoreModule.forRoot(reducers),
                EffectsModule.forRoot([AuthEffects, UserEffects])
            ],
            declarations: [
                AppComponent,
                WelcomeComponent,
                NavbarComponent,
                ProjectInfoComponent
            ],
            providers: [
            ]
        }).compileComponents();

        appStore = TestBed.get(Store);
        router = TestBed.get(Router)

    }));

    beforeEach(() => {
        fixture = TestBed.createComponent(NavbarComponent);
        component = fixture.componentInstance;
        fixture.detectChanges();
    });


    it('asd', fakeAsync(()=> {
        fixture.detectChanges();

        let navigateSpy = spyOn(router, 'navigate');
        component.onUserInfo();
        expect(navigateSpy).toHaveBeenCalledWith(['student/info']);

    }))
});