{ ... }: { services.mpd-mpris = { enable = true; mpd = { network = "tcp"; host = "example.com"; port = 1234; password = "my_password"; }; }; test.stubs.mpd-mpris = { }; nmt.script = '' serviceFile=home-files/.config/systemd/user/mpd-mpris.service assertFileContent "$serviceFile" ${./configuration-with-password.service} ''; }