单元测试延迟加载模块路由

我在路由单元测试方面遇到一些问题。我试过了this https://stackoverflow.com/questions/51635273/angular-unit-testing-lazy-loaded-modules-with-routing解决方案，但是现在这个延迟加载符号已弃用 https://stackoverflow.com/questions/59943328/what-is-difference-between-loadchildren-import-hoge-module-ts-thenm，所以我的测试由于某种原因失败了。 有人可以给我建议我的代码可能有什么问题吗？

应用程序路由.module.ts:

export const routes: Routes = [
{path: 'about', component: AboutComponent},
{path: 'files', loadChildren: () => import('./files/files.module').then(m => m.FilesModule)}, 
];

@NgModule({
 imports: [RouterModule.forRoot(routes)],
 exports: [RouterModule]
})
export class AppRoutingModule { }

应用程序路由.module.spec.ts:

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

   beforeEach(() => {
   TestBed.configureTestingModule({
       imports:[
           RouterTestingModule.withRoutes(routes),
           HttpClientModule,
           AboutComponent,
       ],
       declarations: [
           AppComponent,
           FilesComponent,
       ],
       providers: [{provide: APP_BASE_HREF, useValue: '/'}]
   })

   router = TestBed.get(Router);
   location = TestBed.get(Location);

   fixture = TestBed.createComponent(AppComponent);
   router.initialNavigation();
   });

   it('should navigate to files', fakeAsync(() => {
       const loader = TestBed.get(NgModuleFactoryLoader);
       loader.stubbedModules = {lazyModule : FilesModule }

       router.resetConfig([
           {path: 'files', loadChildren: 'lazyModule'},
       ]);

       router.navigate(['files']);
       tick(50);
       fixture.detectChanges();

       expect(location.path()).toBe('/files');
   }));
});

谢谢你！

你试过了吗：

router.resetConfig([
  { path: 'files', loadChildren: () => Promise.resolve(FilesModule) },
 ]);

?

或者此时它可能只是一个间谍

const spy = jasmine.createSpy('loadChildren');
...
router.resetConfig([
  { path: 'files', loadChildren: spy  },
 ]);
...
expect(spy).toHaveBeenCalled();

未经测试，所以不知道它是否有效。