How to test if a UIControlEvents has been fired

Question

I have a library implementing a custom UIControl with a method which would fire a .valueChanged event when called. I would like to test the method

Answer 1

Apple's documentation for UIControl states that:

When a control-specific event occurs, the control calls any associated action methods right away. Action methods are dispatched through the current UIApplication object, which finds an appropriate object to handle the message, following the responder chain if needed.

When sendActions(for:) is called on a UIControl, the control will call the UIApplication's sendAction(_:to:from:for:) to deliver the event to the registered target.

Since I am testing a library without any Host Application, there is no UIApplication object. Hence, the .valueChanged event is not dispatched and the observe method does not get called.