Ion-input does not fires `blur` event

It seems that ion-input does not trigger event handler bound to Angular’s (blur) event but does trigger if I use (ionBlur). But in turn I have a problem with testing ionBlur because I have no idea how to programatically (in test) emit event. (somewhere I have found that <debugElement>.componenetInstance.ionBlur.emit() worked in ionic-v3 but it’s not the case in ionic-v4/5 because ionBlur is an Observable.

Any idea?