Spy on the result of an Observable Subscription with Jasmine

Question

I am Jasmine unit testing an angular component, which uses Observables. My component has this lifecycle hook that I am testing:

ngOnInit() {
  this.dataService.ge         


        

Answer 1

Instead of

spyOn(service, 'getCellOEE').and.returnValue({ subscribe: () => { } });

You could try

spyOn(service, 'getCellOEE').and.returnValue( {subscribe: (callback) => callback()});