The more we add features to our software the more it grows in complexity. And as it grows in complexity, more time is required to manually test it....
For further actions, you may consider blocking this person and/or reporting abuse
Great article! one question hope you could help me. All my components are written in app module. When i try to test one component(TestComponent), in the test.component.spec.file, i wrote below code. because i already declare the TestComponent in AppModule and used some third party components, i directly import it. When i run the test case, i didn't see 'fixture' getting printed in the console and the application throws error, TestBed.createComponent() failed and i don't know why...
beforeEach(async(() => {
TestBed.configureTestingModule({
declarations: [],
imports: [AppModule]
})
.compileComponents();
fixture = TestBed.createComponent(TestComponent);
console.log('fixture');
console.log(fixture);
}));
Error:
TypeError: Cannot read property 'get' of undefined
error properties: Object({ ngDebugContext: DebugContext_({ view: Object({ def: Object({ factory: Function, nodeFlags: 34127873, rootNodeFlags: 33554433, nodeMatchedQueries: 0, flags: 0, nodes: [ Object({ nodeIndex: 0, parent: null, renderParent: null, bindingIndex: 0, outputIndex: 0, checkIndex: 0, flags: 33554433, childFlags: 573440, directChildFlags: 573440, childMatchedQueries: 0, matchedQueries: Object({ }), matchedQueryIds: 0, references: Object({ }), ngContentIndex: null, childCount: 1, bindings: [ ], bindingFlags: 0, outputs: [ Object({ type: 0, target: 'document', eventName: 'click', propName: null }) ], element: Object({ ns: '', name: 'app-click-map-page', attrs: [ ], template: null, componentProvider: Object({ nodeIndex: 1, parent: , renderParent: , bindingIndex: 0, outputIndex: 1, checkIndex: 1, flags: 573440, childFlags: 0, directChildFlags: 0, childMatchedQueries: 0, matchedQueries: Object, matchedQueryIds: 0, references: Object, ...
at
at new SharedService (localhost:9876/_karma_webpack_/src...)
Hi,
When you import the appModule, you are importing all the exported properties of the appModule.
Do you have your testComponent in the exports array of the appModule ?
Yes I export it.. TestComponent extend another class and that class is using Injector to get service without using constructor.. The error happens at: AppModule.Injector.get(TestService) this line, said Cannot read property 'get' of undefined.
I create a question of this on stackoverflow, stackoverflow.com/questions/588577...
Maybe you could help give some advice. Thanks tons. : )
Thank you for the article Mustapha. I am learning unit testing from 0 in an Angular project I started a month ago and your knowledge is more than appreciated.
Do you have other articles related to unit testing (even at a general level)?
check medium blogs also there are some great resources :medium.com/search?q=angular%20unit...
Nice and clear explanations, Mustapha. I've just started to see Angular testing today, so the thorough explanation really cleared my idea. Thanks :D
Thanks for the kind words! Glad i could help :)
Nice and good explanation , thanks for this great article
Glad i could help. Thanks for the feedback
Hi Mustapha Aouas,
Top, very nice and helpful !
Thanks for sharing.
TheAngularGuy, now I have something to do this weekend. Thank you
Glad to hear that, have fun ;)
can we test modules as well?
Of course you can configure your testbed like this:
Then test if all providers are correctly provided by the module with
TestBed.get
or the new notationTestBed.inject
(ng 10+).Beside from that, i dont know what do you want to test ?
Great article!