AFAIK, Nix even has a testing framework, where you can start a VM and simulate various actions inside it. All described by a single Nix script. I haven't explor

AFAIK, Nix even has a testing framework, where you can start a VM and simulate various actions inside it. All described by a single Nix script. I haven't explored it myself yet, but I understand it's used for unit-testing various Nix packages.