Any idea about how to test it? I am having this error when executing the test: error properties: Object ( { longStack: 'TypeError: Cannot read property 'value' of undefined UPDATE: The problem was that I was testing the observable in the wrong way. I was using "value" instead of "result". The solution in the unit test is as follows: Unit test It is pretty straightforward to mock the ActivatedRoute in the User component test file. All we have to do is to edit the providers list as follows:
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This can be done using the ActivatedRouteSnaphot: book.component.ts ngOnInit() { this. bookId = +this. activatedRoute. snapshot. paramMap.get('bookId'); this.getBook(this.bookId); } Since the activatedRoute is accessed inside of ngOnInit, we will need to mock the activatedRoute in our unit tests. An observable of the static and resolved data of this route. outlet: string. The outlet name of the route, a constant. component: Type
| null. The component of the route, a constant. routeConfig: Route | null. Read-Only. The configuration used to match this route. root: ActivatedRoute. When we are talking about mocking ActivatedRoute , we mean a solution to provide stub params in the snapshot of ActivatedRoute which are used in the component under test. activatedRoute.snapshot Let's assume we have the next TargetComponent component, which relies on the paramId of the ActivatedRoute snapshot. @Component({ selector: 'target', This test doesn't use the router to generate this snapshot because the role of the ActivatedRoute in this test is to merely supply the snapshot. Supplying the snapshot here avoids the extra setup work that would be required to have the router generate the snapshot automatically.. Then in the unit test, you'll inject the ActivatedRoute.
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1 Hey, Are you going to write Unit Test Cases in your Angular Project??? Before starting let's look into the challenges for writing the test cases. What does a Basic Angular Component. Thursday, April 23, 2020 Mocking out Angular's ActivatedRoute for Unit Tests Ryan Jordan @ryanjordandev I've been writing a ton of unit tests and snapshot tests lately. While doing so, I have had to mock out a few things. This includes the ActivatedRoute. So let's say we have the following component. 1 Testing Angular routing components with the RouterTestingModule 2 Testing routed Angular components with the RouterTestingModule 3 Testing Angular route guards with the RouterTestingModule 4 Testing Angular routing components with RouterTestingHarness, provideLocationMocks, and provideRouter 5 Testing routed components with RouterTestingHarness To configure TestBed as described above, the code can be next: To test the resolver we need to render RouterOutlet. const fixture = MockRender(RouterOutlet, {}); // {} is required to leave inputs untouched. Additionally, we also need to properly customize mocked services if the resolver is using them to fetch data. 
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1 Testing Angular routing components with the RouterTestingModule 2 Testing routed Angular components with the RouterTestingModule 3 Testing Angular route guards with the RouterTestingModule 4 Testing Angular routing components with RouterTestingHarness, provideLocationMocks, and provideRouter 5 Testing routed components with RouterTestingHarness Absolutely, that is, if you're writing unit tests. If you want to get fervidly-serious about testing the routing functionality of your application then use e2e tests. But otherwise, a mock or spy object is the way to go. And that, my friend, is how to write unit tests for the pieces of your Angular application that depend on the Angular router.
In this tutorial you will learn about Angular ActivatedRoute interface class with example, Angular offers ActivatedRoute interface class.It carries the information about a route linked to a component loaded into the Angular app template. An ActivatedRoute contains the router state tree within the angular app's memory. Set up Angular Project Conventional wisdom might suggest that test authors should stub external dependencies like ActivatedRoute or RouterLink and spy on services and service methods like navigateByUrl. A defense for this… 
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When a user goes to a URL for an Angular application, the router parses the URL to determine which component and data to load. Whenever a URL changes, whether someone enters it directly or clicks a link, the router sets up the appropriate application state. Each segment of the path encodes information about that state. 11 Answers Sorted by: 52 A simple way to mock ActivatedRoute is this one: TestBed.configureTestingModule ( { declarations: [YourComponenToTest], providers: [ { provide: ActivatedRoute, useValue: { params: Observable.from ( [ {id: 1}]), }, }, ] });
