home-manager/tests/modules/systemd/user-config.nix

{ pkgs, ... }:

{
  systemd.user.settings.Manager = {
    LogLevel = "debug";
    DefaultCPUAccounting = true;
    DefaultEnvironment = {
      TEST = "abc";
      PATH = "/bin:/sbin:/some where";
    };
  };

  nmt.script = ''
    userConf=home-files/.config/systemd/user.conf
    assertFileExists $userConf
    assertFileContent $userConf ${
      pkgs.writeText "expected" ''
        [Manager]
        DefaultCPUAccounting=true
        DefaultEnvironment=PATH='/bin:/sbin:/some where' TEST=abc
        LogLevel=debug
      ''
    }
  '';
}