If your components are changing state using Router.navigate() then you’ll need to mock these out in your unit tests. Here’s how to do it.

1) Import the Router from @angular.

import { Router } from '@angular/router';

2) Add the Router to your providers array and swap it out for a mock router.

TestBed.configureTestingModule ( {
	providers: [
		{ provide: Router, useValue: mockRouter},
	]
} )

3) Finally create mockRouter and create a jasmine spy to watch the navigate method.

let mockRouter = {
	navigate: jasmine.createSpy('navigate')
}

This will stop your unit test failing when the component can’t find the <router-outlet></router-outlet> element when the test runs.

You can then test that router.navigate() has been called using:

expect (mockRouter.navigate).toHaveBeenCalledWith (['/login']);