My unit test doesn't pass because of this error: "Failed: Cannot read properties of undefined (reading 'nativeElement')". I think that the problem is incorrect mocking of ViewChildren, but I don't know how do it right. Can someone please help to fix it?
ts
@ViewChildren('locationInput') inputs: QueryList<ElementRef>;
addCity(): void {
this.items = this.locationForm.get('items') as FormArray;
if (this.regionSelected && this.checkIfAllCitysAreSelected()) {
this.items.push(this.createItem());
this.quantityOfLocations++;
this.cdr.detectChanges();
const tempInput = this.inputs.toArray()[this.quantityOfLocations - 1].nativeElement;
this.tempAutocomplete = new google.maps.places.Autocomplete(tempInput, this.localityOptions);
this.tempAutocomplete.setBounds(this.regionBounds);
this.tempAutocomplete.setOptions(this.localityOptions);
this.autocomplete.push(this.tempAutocomplete);
this.addEventToAutocomplete(this.quantityOfLocations - 1);
}
}
spec.ts
it('method addCity should add new item and add autocomplete', async(() => {
let array: FormGroup[] = [];
array.push(mockedForm);
let formArray = new FormArray(array);
component.locationForm = new FormGroup({
items: formArray
});
const spy = spyOn(component, 'addEventToAutocomplete');
spyOn(component, 'checkIfAllCitysAreSelected').and.returnValue(true);
component.regionSelected = true;
fixture.detectChanges();
component.inputs[1] = new ElementRef({ nativeElement: { value: 'fake' } });
component.addCity();
expect(component.quantityOfLocations).toBe(1);
expect((component.locationForm.controls['items'] as FormArray).length).toBe(2);
expect(component.tempAutocomplete).toBeTruthy();
expect(spy).toHaveBeenCalled();
}));
Thanks for the help!
The problem occurs with the changes on ViewChildren element. It can be solved easily just by instead of:
@ViewChildren('locationInput') inputs: QueryList<ElementRef>;
to:
@ViewChildren('locationInput', {static: true}) inputs: QueryList<ElementRef>;
It should solve your problem.