Jasmine test property observable subscribe

I have this code:

export class ProgramComponent implements OnInit {
   @Input() events: Observable<any>;
   eventsSubscription: any;
   ...
   ngOnInit() {
      this.eventsSubscription = this.events.subscribe((event) => {
          ... <- Some code that I want to test!!!!
          console.log("The test doesn't get past here!!!!");
      });
   }
}

describe('BLA BLA BLA', () => {
   let component: ProgramComponent;
   let fixture: ComponentFixture<ProgramComponent>;

   beforeEach(async(() => {
       TestBed.configureTestingModule({
          imports: [
              ...
          ],
          declarations: [ProgramComponent],
          providers: [
              ...
          ]
       }).compileComponents();
    }));

    beforeEach(() => {
       fixture = TestBed.createComponent(ProgramComponent);
       component = fixture.componentInstance;

       // HERE I WANT TO SPY ON THAT EVENTS OBSERVABLE AND RETURN SOME VALUE
       // I tried this without success
       spyOn(component, 'events').and.returnValue({type: 'somevalue'}))

       fixture.detectChanges();
    });

    it('should create', () => {
       expect(component).toBeTruthy();
    });
});

The problem is that fixture.detectChanges(); does not trigger the subscribe of the events observable. Do I have to use spyOnProperty? But it's an Input of the component...

I already check this and this.

Thanks!