{ config, lib, pkgs, ... }: with lib; { config = { nix = { registry = { nixpkgs = { to = { type = "github"; owner = "my-org"; repo = "my-nixpkgs"; }; }; }; }; nmt.script = '' assertFileContent \ home-files/.config/nix/registry.json \ ${./example-registry-expected.json} ''; }; }