/Javascript/AngularJS/How to write a test case for dropdown selection change in angular 9

How to write a test case for dropdown selection change in angular 9

selectEl = fixture.debugElement.query(By.css('#dropdown'));
selectEl.nativeElement.options[3].nativeElement.dispatchEvent(new Event('click'));
selectEl.queryAll(By.css('option'))[3].nativeElement.click();
selectEl.nativeElement.options[3].nativeElement.click();

Source: stackoverflow.com

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