What is the most effective approach to testing a function that returns an observable with the tap operator?
operations(numbers): Observable{
const sumValue = numbers[0]+numbers[1]
return sumService.getOperations(sumValue).pipe(tap(randomOperationValue => {this.value = randomOperationValue}
))
}
I am facing difficulty in testing the value inside the tap operator. I attempted to mock getOperations() but was unsuccessful.
Starting with a brief introduction
describe('AppComponent test suite', () => {
let svc: OperationsService;
let fixture: ComponentFixture<AppComponent>;
let component: AppComponent;
beforeEach(async () => {
TestBed.configureTestingModule({
declarations: [AppComponent],
providers: [{
provide: OperationsService,
useValue: {
getOperations: () => of(1000),
}
}]
});
svc = TestBed.inject(OperationsService);
fixture = TestBed.createComponent(AppComponent);
component = fixture.componentInstance;
});
it('should perform expected operations', fakeAsync(() => {
const spy = jest.spyOn(svc, 'getOperations');
const obs$ = component.operations([100, 200]);
obs$.subscribe();
tick();
expect(spy).toHaveBeenCalledWith(300);
expect(component.value).toBe(1000); // verifying the mocked fixed value
}));
});
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