Jest Unit test Using Angular (No Jasmine)

`Hi All, I am stuck in writing a unit test for the below function in Angular.

Here is my unit test:
describe('ProductAccountSetupComponent', () => {
let urlsService: GBUrlsService;
let componentRefInstanceSpy: any;
let component: ProductAccountSetupComponent;
let fixture: ComponentFixture<ProductAccountSetupComponent>;

beforeEach(async () => {
await TestBed.configureTestingModule({
declarations: [ProductAccountSetupComponent],
schemas: [CUSTOM_ELEMENTS_SCHEMA],
providers: [
{ provide: GBDataStore, useValue: dataStore },
{ provide: GBRouterService, useValue: routerService },
{
provide: GBAccountService,
useValue: new MockAccountService()
},
{ provide: GBRoutes, useValue: {} },
{ provide: GBTridionService, useValue: {} },
{ provide: GBUrlsService, useValue: mockUrlsService },
{ provide: GBOfferService, useValue: mockOfferService }
],

}).compileComponents();

componentRefInstanceSpy = { cancel: { subscribe: jest.fn() } };

fixture.detectChanges();

});
describe('#initAccountSetup', () => {
it('should create ZeroUnlinkedGoalsComponent and subscribe to cancel', () => {
jest.spyOn(component, 'create');
const spy = jest.spyOn(component, 'reset');
componentRefInstanceSpy.cancel.subscribe.mockImplementationOnce((callback) => {
callback();
});
fixture.detectChanges();
component.initZeroUnlinkedTemplate();
expect(spy).toHaveBeenCalled();
});
});
});


I get error: Parameter 'callback' implicitly has an 'any' type.

I tried to mock componentRef but get error. I am trying to accomplish fixing the above error.

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