{ config, pkgs, ... }: { config = { services.redshift = { enable = true; provider = "manual"; latitude = "0.0"; longitude = "0.0"; }; nixpkgs.overlays = [ (self: super: { redshift = pkgs.writeScriptBin "dummy-redshift" "" // { outPath = "@redshift@"; }; }) ]; nmt.script = '' assertFileContent \ home-files/.config/systemd/user/redshift.service \ ${./redshift-basic-configuration-expected.service} ''; }; }