To simplify the testing process, utilize RouterTestingModule and spy on the navigate function in the following manner:

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

import { MyModule } from './my-module';
import { MyComponent } from './my-component';

describe('testing something', () => {

    let fixture: ComponentFixture<LandingComponent>;
    let router: Router;

    beforeEach(() => {

        TestBed.configureTestingModule({
            imports: [
                MyModule,
                RouterTestingModule.withRoutes([]),
            ],
        }).compileComponents();

        fixture = TestBed.createComponent(MyComponent);
        router = TestBed.get(Router); // For Angular 9+, use TestBed.inject(Router)

    });

    it('should perform navigation successfully', () => {
        const component = fixture.componentInstance;
        const navigateSpy = spyOn(router, 'navigate');

        component.goSomewhere();
        expect(navigateSpy).toHaveBeenCalledWith(['/expectedUrl']);
    });
});

One reason for this is that the Route has specific dependencies that it requires to be passed to its constructor.

When working with Angular components, it's best to utilize the Angular testing infrastructure for tests instead of trying to isolate them. This involves allowing Angular to create the component and inject all necessary dependencies, rather than manually setting up everything yourself.

To begin, you should have a setup similar to the following:

import { TestBed } from '@angular/core/testing';

describe('Component: NavTool', () => {
  let mockRouter = {
    navigate: jasmine.createSpy('navigate')
  };
  beforeEach(() => {
    TestBed.configureTestingModule({
      declarations: [ NavToolComponent ],
      providers: [
        { provide: Router, useValue: mockRouter },
        ComponentComm
      ]
    });
  });
  it('should click link', () => {
    let fixture = TestBed.createComponent(NavToolComponent);
    fixture.detectChanges();
    let component: NavToolComponent = fixture.componentInstance;
    component.clickLink('home');
    expect(mockRouter.navigate).toHaveBeenCalledWith(['/home']);
  });
});

This code snippet demonstrates using TestBed to set up a testing module from scratch. It mirrors configuration with an @NgModule.

In this scenario, we are simply creating a mock router. Since this is a unit test, the actual routing functionality is not needed—our focus is on verifying that the correct call is made. The mock and spy functionalities help capture these interactions.

If you do require the real router, then consider using RouterTestingModule, where routes can be configured. Additional guidance can be found in examples here and here.

For Further Reference:

• Explore the Angular documentation on Testing for more instances utilizing the Angular testing framework.

Here is an example of injecting the Route service into our component controller:

import { TestBed, async } from '@angular/core/testing';
import { RouterTestingModule } from '@angular/router/testing'; // Including service injection in the component
import { Router } from '@angular/router'; // Importing for testing Route Service functionality

import { AppComponent } from './app.component';
import { DummyLoginLayoutComponent } from '../../../testing/mock.components.spec'; // Including service injection in the component

describe('AppComponent', () => {
  let router: Router; // Declaring for testing Route Service functionality

  beforeEach(async(() => {
    TestBed.configureTestingModule({
      declarations: [
        AppComponent,
        DummyLoginLayoutComponent // Including service injection in the component
      ],
      imports: [
        RouterTestingModule.withRoutes([
          { path: 'login', component: DummyLoginLayoutComponent },
        ]) // Including service injection in the component
      ],
    }).compileComponents();

    router = TestBed.get(Router); // Accessing for testing Route Service functionality
    router.initialNavigation(); // Setting up for testing Route Service functionality
  }));

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

We can also test other functionalities such as navigate(). For example:

it('should call eventPage once with /register path if event is instanceof NavigationStart', fakeAsync(() => {
    spyOn(analyticService, 'eventPage');
    router.navigate(['register'])
      .then(() => {
        const baseUrl = window.location.origin;
        const url = `${baseUrl}/register`;
        expect(analyticService.eventPage).toHaveBeenCalledTimes(1);
        expect(analyticService.eventPage).toHaveBeenCalledWith(url);
      });
}));

List of all mock components in my file (mock.components.specs.ts)

import { Component } from '@angular/core';

@Component({
    selector: 'home',
    template: '<div>Dummy home component</div>',
    styleUrls: []
})

export class DummyHomeComponent { }

Jasmine takes it up a notch by incorporating complete spy objects...

describe('Test involving router', () => {
    const router = jasmine.createSpyObj('Router', ['navigate']);
    ...
    beforeEach(async(() => {
        TestBed.configureTestingModule({
            providers: [  { provide: Router, useValue: router } ],
            ...
    });        
});

To accomplish this task, another method involves checking the current URL using the Location object.

In the scenario below, we ...

1. locate the component
2. utilize fakeAsync and tick to ensure the test performs asynchronous operations correctly
3. simulate the click event
4. verify the current url

it('navigates on NavToolComponent button click', fakeAsync(() => {
  // find component
  const button = fixture.debugElement.query(By.directive(NavToolComponent));
  expect(button).withContext('NavToolComponent button exists').toBeTruthy();

  // trigger click event
  button.nativeElement.click();

  // allow async operations to complete
  fixture.detectChanges();
  tick();

  // check current URL
  const location = TestBed.inject(Location);
  expect(location.path()).toEqual('/portfolio/trading');
}));