How to mock ControlContainer for FormArray in Angular Unit Test?

Question

I was trying to mock ControlContainer for FormArray, but i have searched online that only FormGroup and FormControl could be mocked. Is there any workaround for this?

My code as shown below:

create-trip-details.component.html (this is the parent component)

<app-destinations></app-destinations>

create-trip-details.component.ts (this is the parent component)

ngOnInit(): void {
    this.createTripDetailsForm = this.initializeCreateTripDetailsForm();
}

initializeCreateTripDetailsForm() {
    return this.fb.group(
      {
        staticQn2: this.getBasicRequiredControl(),
        destinations: this.fb.array([]),
      }
    );
  }

get destinations(){
    return this.createTripDetailsForm.controls['destinations'] as FormArray;
  }

destinations.component.ts (this is the children component)

constructor(
    public controlContainer: ControlContainer) {
  }
ngOnInit(): void {
    this.destinations.push(this.initDestinationFormGrp());
  }

initDestinationFormGrp(){
    return this.fb.group({
      ctryName:  [null, { validators: [Validators.required]}],
      cityName:  [null, { validators: [Validators.required]}],
      dateFrom: [null, { validators: [Validators.required]}],
      dateTo: [null, { validators: [Validators.required]}]
    },
    {
      validators: this.validateDateFromLaterThanDateTo()
    })
  }

get destinations(){
    return this.controlContainer.control.get('destinations') as FormArray;
  }

destinations.component.spec.ts:

it('validate from and to date in destinations component', () => {
    //ERROR here! - COULD NOT GET component.destinations BELOW!
    //the objective is to allow my component to access child component (destinations) via control container
    component.destinations.setValue(component.sharedVar.createTripModel.tripDetails.destinations);
    fixture.detectChanges();
    component.validateDateFromAndTo(0);
    expect(component.getDestinationFormDateFrom(0).errors).toBe(null);
    expect(component.getDestinationFormDateTo(0).errors).toBe(null);
  });

Error "TypeError: Cannot read properties of undefined (reading 'get')" was shown on "component.destinations" in destinations.component.spec.ts as shown above in the comments. I have tried mocking Control Container as shown in URL below, but seems like it is not applicable for Form Array.

How to mock ControlContainer in angular unit test?