In my years of building stuff, I have for some reason never made a test harness box. Now I have. Meet my lab assistant Igor:
(https://i.imgur.com/Eu7HFdNl.jpeg)
Now I can more properly "rock it before you box it".
(https://i.imgur.com/rkyTG3Ol.jpeg)
That looks really nice. I've taken the terminal strip screwed to a board approach myself so I can definitely appreciate this.