Testing a component in Angular 2 that utilizes the router-outlet functionality

I recently set up an angular 2 project using angular-cli. As part of the setup, I created a separate AppRoutingModule that exports RouterModule and added it to the imports array in AppModule.

Additionally, I have the appComponent which was generated by angular-cli.

The content of app.component.html is as follows:

<nav>
  <a *ngFor="let view of views" routerLink="{{ view.address }}" routerLinkActive="active">{{ view.text }}</a>
</nav>
<router-outlet></router-outlet>

In the app.component.spec.ts file, I have the following:

import { CUSTOM_ELEMENTS_SCHEMA } from '@angular/core';
import { TestBed, async } from '@angular/core/testing';
import { AppComponent } from './app.component';


describe('App: AquaparkFrontend', () => {
  beforeEach(() => {
    TestBed.configureTestingModule({
      declarations: [
        AppComponent
      ],
      schemas: [ CUSTOM_ELEMENTS_SCHEMA ]
    });
  });

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

  it(`should have 3 views`, () => {
    let fixture = TestBed.createComponent(AppComponent);
    let app = fixture.debugElement.componentInstance;
    expect(app.views.length).toEqual(3);
  });
});

However, when I attempt to run tests using 'ng test', I encounter the following error message:

 Can't bind to 'routerLink' since it isn't a known property of 'a'. ("<nav>
      <a *ngFor="let view of views" [ERROR ->]routerLink="{{ view.address }}" routerLinkActive="active">{{ view.text }}</a>
    </nav>
    <router-outlet><"

Am I missing something that needs to be imported for the test to work correctly?

Answer №1

<router-outlet> is a vital component in Angular2+ that must be identified.

To ensure proper testing of the route, you need to include RouterTestingModule. Failure to do so will result in an error, which can be avoided by importing it from router/testing in your spec file:

import { RouterTestingModule } from '@angular/router/testing';


After importing, make sure to use it in the imports[] section like this:

describe('AppComponent', () => {
  beforeEach(async(() => {
    TestBed.configureTestingModule({
      imports:[
        RouterTestingModule //<<< don't forget to import it here as well
      ],
      declarations: [
        AppComponent
      ],
      providers: [{ provide: APP_BASE_HREF, useValue: '/' }]
      
    }).compileComponents();
  }));

Answer №2

Just an FYI, the TestBed is a tool used to create a module from scratch specifically for testing in a controlled environment. Therefore, relying on the AppModule might not provide the assistance you're looking for.

If your focus is not on testing any routing functionalities at all, you can sidestep potential errors by opting for the NO_ERRORS_SCHEMA instead of the CUSTOM_ELEMENTS_SCHEMA. While the latter addresses issues with HTML elements, the former will overlook all errors, even those related to unknown binding attributes.

However, if your goal is to conduct tests on routing components, then setting up routing configurations is essential. This can be achieved using the RouterTestingModule, which serves as a substitute for the RouterModule. For concrete examples and guidance on this topic, check out these helpful links:

  • Exploring Angular 2 unit testing components with routerLink
  • A comprehensive guide to Angular 2 Final Release Router Unit Test

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