title: How can I simulate a tap event on a Flutter widget?
body: <p>How can I simulate tap event on a Flutter widget?</p>
  
  <p>For example, how do I simulate tapping on a Tabbar title? And more importantly, how can I find the widget in the first place? Please note that I don't want to call the relevant callbacks, nor testing widgets using Flutter test classes, but I'd like to simulate the tapping on widgets at runtime instead.</p>
  
  <p>EDIT 1: (Please Note)
  I DO NOT want to test a widget or call a method that is assigned to a GestureDetector.onTap or RaisedButton.onPressed etc...</p>