Mocking private service in component

Hello! Thank you for the great library 😃 The question is how to modify the mock of service in the tested component. I have tried to use MockInstance, but looks like it only works for mocked components. Example:

@Component({
  selector: 'test',
  templateUrl: './test.html'
})
export class ComponentToTest {
 constructor(private _configLocal: TmConfigLocalService){}

public afterViewInit(){
  this._configLocal.treeItems$.subscribe();
}
}

What I have tried:

  beforeEach(()=>{
    MockInstance(ComponentToTest , {
      init: (_instance, injector) => {
        injector!.get(TmConfigLocalService).treeItems$ = of([]);
      },
    });
  })

  it('should create', () => {
    const fixture = MockRender(ComponentToTest); // error
    expect(fixture.point.componentInstance).toBeDefined();
  });

[satanTime]

thanks, I play with it on the weekend and release an update later on.

[satanTime]

That’s right,

if you use useValue - then ngMocks doesn’t touch provided value, despite MockService was used.

if you use .mock(TmConfigLocalService) - it’s a bit more intelligent than MockService(TmConfigLocalService) and causes a call of MockInstance on initialisation of TmConfigLocalService. Because it uses a factory https://github.com/ike18t/ng-mocks/blob/master/lib/mock-service/mock-service.ts#L336-L343, config.init(instance, injector); - of your init function.

I would recommend to use .mock(TmConfigLocalService),

but you can still provide your own mocks like that:

.mock(TmConfigLocalService, {
  treeItems$: of([])
})

and avoid MockInstance at all.