How to get context of items that are in a 3D scene to participate in a test?

<please, if there is an FAQ or other place to ask these questions do let me know>

Thus far ImGui Test Engine checks off most of everything I require from a test framework. What I really would like to know is how (if at all possible) to register callbacks from items that I select within the context of the 3D scene that I have in my app such that I can use them within the test framework?

For example, if my little app has a few objects, and I select one and some behaviour happens, what might be the most sensible way for me to register the event and callback such that later, within that same scene, I can write a test that automates the given action? Is that even sensible within ImGui Test Engine?

Start by reviewing the ImGui Test Engine documentation for test registration, callbacks, and interaction with application state, then compare those capabilities with the application's 3D scene interaction path. Done would be a confirmed integration approach, including whether selected scene objects and their resulting behavior can be exercised from a test.