TypeError: Cannot read property 'add' of undefined

[vladbushev]

I want check what if method service.create runed then method storeService.setType run with null.
I have method service.create he return service.createItem$. service.createItem$ return apiService.create$
In unit

when(apiService.create$(TestDataFactory.createData('AAA')))
            .thenReturn(of(TestDataFactory.createData('AAA')));

 when(service.createItem$(TestDataFactory.createData('AAA')))
            .thenReturn(of(TestDataFactory.createData('AAA')));

it('should create', fakeAsync(() => {
            service.create(TestDataFactory.createData('AAA'));

            expect(storeService.setType).toHaveBeenCalledWith(null);
        }));

[matyx]

Can you provide full example? I cant figure out what are you trying to do...