If I were to lose all the code for my Elite: Dangerous 3rd party application, I'd not be losing just the code - I'd be losing all the UI stuff. Even IF I ever

If I were to lose all the code for my Elite: Dangerous 3rd party application, I'd not be losing just the code - I'd be losing all the UI stuff. Even IF I ever wrote unit tests for it - which I don't do and have never done for anything - those unit tests wouldn't have anything in them from which I could reconstruct the UI. No. You save the code and the surrounding UI and the UI glue code.