unit testing how can i test angular acrivated route subscribe
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.
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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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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}]), }, }, ] });
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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.
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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
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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.
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An observable of the static and resolved data of this route. outlet: string. The outlet name of the route, a constant. component: Type
unit testing how can i test angular acrivated route subscribe
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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Angular Unit testing - Mocking - ActivatedRoute. When it comes to unit testing you will have to isolate your component and test that component without thinking about any of the dependencies, this is where you will have to use Mocks, it can be a Mocked service, Route, etc. Let see how you can mock a query string parameter of ActivatedRoute
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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.
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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
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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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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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We are going to pull in ActivatedRoute and a mock version of it. An instance of the mock version will be created, which will replace the real ActivatedRoute for our tests. Let's create the mock version of ActivatedRoute. Create a folder under src called mocks and add a file named activated-route.ts and add the following code:
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1 I'm using activated route to listen route data changes: this.activatedRoute.params.subscribe (params => { this.model.load (params ['id']); }); In my unit test I want to mock this part this.activatedRoute.params.subscribe to provide test data:
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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: