I'm attempting to test a pretty complex service within my Angular application. To do this I need to be able to mock the number of different dependencies that the service has, I'm using spies to achieve this.
The service does a couple of different things with two of the dependencies within its constructor, and before I start testing the service I need to make sure it constructs properly, so I need to satisfy the requirements of the constructor.
The constructor has two separate subscriptions, one on a method that returns Observable<string> and one on a BehaviourSubject<boolean>.
constructor(
private _translate: TranslateService,
private _policiesService: PoliciesService,
) {
_translate.get('services.filter').subscribe((filterObject: any) => {
// do stuff...
});
this._policiesService.isPolicyLocked.subscribe(activePolicyLockState => {
// do stuff...
});
}
I can easily mock the first subscription, by using a spy and then assigning a method and a return value in my beforeEach(), as below.
beforeEach(() => {
spy_TranslateService = jasmine.createSpyObj('TranslateService', ['get', 'setDefaultLang']);
spy_TranslateService.get.and.returnValue(of(translationFilterObject));
//etc..
});
But I can't do this with my behaviour subject, as it's not a method its a property of the PoliciesService. Is there a way that I can mock a property and give it a specific return value, similar to how I can with methods? Preferably without having to use getters and setters.
