Angular unit test - how to test reactive form reset method?

I'm trying to test this method:

doResetForm(){
this.form.reset();
}


so I tried:

it('should reset the form', () => {
const spyformReset = jest.spyOn(component.form, 'reset');

fixture.detectChanges();
component.doResetForm();
expect(spyformReset).toHaveBeenCalled();
}


but I'm getting the error:

Cannot spyon on a primitive value, undefined give
​

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