javascript - The "Angular" way of testing a component -

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in angular 1, if wrote component, make sure that:

  • dependencies, such services being mocked.
  • unit tests written methods within component.
  • the component calling service retrieve data expect(service.method).tohavebeencalled()
  • the component updating view given updated model.

i've been doing research on angular 2 component testing, , articles can find, seems testing being done follows;

  • create service mock returns fixed result (ex: 'test quote')
  • expect view contains result coming mocked service (ex; there's div somewhere has <div>test quote</div>).

here few examples of such articles (basically top results on google 'angular 2 component testing')

since ng2 provides no spies in it's testing framework @angular/core/testing, it's recommended avoid step in bold altogether? or should including jasmine have access spies?

if looking test component rendering, can use testcomponentbuilder explained in blogs mentioned in question. 

    describe('mycomponent', () => {        it('should render list', async(inject([testcomponentbuilder], (tcb: testcomponentbuilder) => {         return tcb.createasync(mycomponent).then((componentfixture: componentfixture) => {           const element = componentfixture.nativeelement;          //... element want check            componentfixture.detectchanges();           expect(element).tohavetext('test div');           expect(element.queryselectorall('div').length).tobe(1);         });       }));     }));

if service being called in component want inject in beforeeachproviders() or beforeeach() method :

beforeeach(() => {     addproviders([       provide(loginservice, { useclass: mockloginservice }),       userservice     ]);   });

using jasmine spies along methods and.callthrough , and.returnvalue useful when want mock service call in component. additionally, have @ this repo angular team member julie raplh.


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