Angular 2 testing update form.value after checkbox check

I am writing test, which expects to store new form.value in localStorage. By now I need to find out how to update form.value. Here is my code:

it('should remember form values and store them in localStorage', fakeAsync(() => {
    let lsService: LocalStorageService = fixture.debugElement.injector.get(LocalStorageService);
    console.log(component.filterForm.value);
    tick();
    fakeCheck('[name="notFullyLoaded"]');
    fixture.detectChanges();
    console.log(component.filterForm.value);
}));

function fakeCheck(selector: string) {
    fixture.detectChanges();
    tick();

    let input = fixture.debugElement.query(By.css(selector)).nativeElement;
    input.checked = true;

    tick();

}