Whenever you would press F5 in the editor godot (to play the main scene) a list of all the tesing levels would be listed.
With a press of a button, the appropriate level would be played
Programming wise:
There is a folder called "gamplay/testing", it would house all the testing scenes, whenever we would add a scene to this folder, the list presented at the start up of the project would take it in count.
(It would take one day to implement, if nothing goes wrong)
The idea user wise:
Programming wise:
(It would take one day to implement, if nothing goes wrong)