Testing the routing functionality in Angular 7

After creating an application with various components and successfully implementing navigation between pages, I am now looking to write tests for the routing section. Below is my router.spec.ts:

    import { Location } from "@angular/common";
    import { TestBed, fakeAsync, tick, async } from "@angular/core/testing";
    import { RouterTestingModule } from "@angular/router/testing";
    import { Router } from "@angular/router";

    import { HomeComponent } from './home/home.component';
    import { AboutComponent } from './about/about.component';
    import { AppComponent } from '../app.component';

    describe('AppComponent', () => {
      let location: Location;
      let router: Router;
      let fixture;
      beforeEach(async(() => {
        TestBed.configureTestingModule({
          declarations: [HomeComponent, AboutComponent, AppComponent],
          imports: [RouterTestingModule]
        }).compileComponents();
        router = TestBed.get(Router);
        location = TestBed.get(Location);

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

      it('should create the app', async(() => {
        const fixture = TestBed.createComponent(AppComponent);
        console.log(fixture);
        const app = fixture.debugElement.componentInstance;
        expect(app).toBeTruthy();
      }));

      it('navigate to "home" redirects you to /home', fakeAsync(() => { 
        router.navigate(['home']); 
        tick(); 
        expect(location.path()).toBe('/home'); 
      }));

      // it('navigate to "about" takes you to /about', fakeAsync(() => {
      //   router.navigate(['about']);
      //   tick();
      //   expect(location.path()).toBe('/about');
      // }));
    });

Here is my splash-routing.module.ts:

    import { NgModule } from '@angular/core';
    import { Routes, RouterModule } from '@angular/router';
    import { RootComponent } from './root/root.component';

    import { AboutComponent } from './about/about.component';
    import { PricingComponent } from './pricing/pricing.component';
    import { ContactComponent } from './contact/contact.component';
    import { LoginComponent } from './login/login.component';
    import { HomeComponent } from './home/home.component';
    import { PageNotFoundComponent } from './page-not-found/page-not-found.component';


    export const routes: Routes = [
      {path: '', component: RootComponent, children: [
        {path: '', component: HomeComponent},
        {path: 'home', component: HomeComponent},
        {path: 'about', component: AboutComponent},
        {path: 'pricing', component: PricingComponent},
        {path: 'contact', component: ContactComponent},
        {path: 'login', component: LoginComponent},
        {path: 'notfound', component: PageNotFoundComponent},
        { 
          path: '**', // bonus: all routes not defined forward to /home
          redirectTo: 'notfound'
        },
        {path: '', redirectTo: 'home'},
      ]},
    ];

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

While running tests using ng test, I encountered an error as shown in this image: https://i.sstatic.net/msTlK.jpg. Can someone help me understand what I'm doing wrong? I also need to write tests for other components, so any guidance would be greatly appreciated.

Answer №1

To successfully use the RouterTestingModule, you must define the necessary routes using the method withRoutes.

If no routes are specified, an error will be triggered stating that

Cannot match any routes. URL Segment home
.

Update your code to resemble the following:

TestBed.configureTestingModule({
      declarations: [HomeComponent, AboutComponent, AppComponent],
      imports: [RouterTestingModule.withRoutes(routes)] <---------- 
    }).compileComponents();

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