angular - Unit test case for nativeElement focus

Question

I need help to fix unit test cases in angular I have function to set focus on button element and this function is called in ngOnInit below is the code

public buttonElement: ElementRef,
private changeDector: ChangeDetectorRef,

above two line of code in constructor

setTimeout(() => {

    if (this.buttonElement.nativeElement.querySelectorAll('button')[0]) {
      this.buttonElement.nativeElement.querySelectorAll('button')[0].focus();
    }
}, 500);

this.changeDector.detectChanges();

I need to cover this function in unit test case .

question from:https://stackoverflow.com/questions/65919798/unit-test-case-for-nativeelement-focus

Answer 1

Waitting for answers