How to get nativeElement [attributes] value in angular test?

There are not any problem to take attributes value in the following case:

<object class="someClass" someAttribute="someValue"></object>

const elem = fixture.debugElement.query(By.css('.someClass')).nativeElement;
elem.getAttribute('someAttribute');

But how to take attributes value in this case?

<object class="someClass" [someAttribute]="someValue"></object>