tests: strengthen service tests with meaningful runtime assertions

Replace bare "is running" checks with config file presence, socket
existence, CLI tool invocations, state directory checks, and HTTP
health probes where applicable. nvidia-persistenced/powerd drop the
running check entirely (requires real GPU hardware). jellyfin drops
the HTTP check (SIGABRT on aarch64 QEMU).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: parzivale

modules/services/accounts-daemon/test.nix

@@ -12,8 +12,13 @@
     testScript = ''
       machine.start()
       machine.wait_for_console_text("entering runlevel 2")
+
       with subtest("accounts-daemon is running"):
           machine.wait_until_succeeds("initctl status accounts-daemon | grep running", timeout=30)
+
+      with subtest("AccountsService state directory exists"):
+          machine.succeed("test -d /var/lib/AccountsService")
+
       machine.shutdown()
     '';
   };

modules/services/bluetooth/test.nix

@@ -16,6 +16,9 @@
       with subtest("bluetooth is running"):
           machine.wait_until_succeeds("initctl status bluetooth | grep running", timeout=30)
 
+      with subtest("bluetooth config is installed"):
+          machine.succeed("test -f /etc/bluetooth/main.conf")
+
       machine.shutdown()
     '';
   };

modules/services/dbus/test.nix

@@ -15,6 +15,9 @@
       with subtest("dbus is running"):
           machine.wait_until_succeeds("initctl status dbus | grep running", timeout=30)
 
+      with subtest("dbus system socket exists"):
+          machine.succeed("test -S /run/dbus/system_bus_socket")
+
       machine.shutdown()
     '';
   };

modules/services/docker/test.nix

@@ -15,6 +15,12 @@
       with subtest("docker is running"):
           machine.wait_until_succeeds("initctl status docker | grep running", timeout=30)
 
+      with subtest("docker daemon config is installed"):
+          machine.succeed("test -f /etc/docker/daemon.json")
+
+      with subtest("docker socket exists"):
+          machine.wait_until_succeeds("test -S /run/docker.sock", timeout=30)
+
       machine.shutdown()
     '';
   };

modules/services/earlyoom/test.nix

@@ -15,6 +15,9 @@
       with subtest("earlyoom is running"):
           machine.wait_until_succeeds("initctl status earlyoom | grep running", timeout=30)
 
+      with subtest("earlyoom finit service is configured"):
+          machine.succeed("test -f /etc/finit.d/earlyoom.conf")
+
       machine.shutdown()
     '';
   };

modules/services/elogind/test.nix

@@ -16,6 +16,12 @@
       with subtest("elogind is running"):
           machine.wait_until_succeeds("initctl status elogind | grep running", timeout=30)
 
+      with subtest("elogind config is installed"):
+          machine.succeed("test -f /etc/elogind/logind.conf")
+
+      with subtest("loginctl is usable"):
+          machine.succeed("loginctl list-sessions")
+
       machine.shutdown()
     '';
   };

modules/services/flatpak/test.nix

@@ -16,6 +16,10 @@
       with subtest("flatpak binary is available"):
           machine.succeed("flatpak --version")
 
+      with subtest("flatpak user and group exist"):
+          machine.succeed("id flatpak")
+          machine.succeed("getent group flatpak")
+
       machine.shutdown()
     '';
   };

modules/services/fwupd/test.nix

@@ -17,6 +17,9 @@
       with subtest("fwupd is running"):
           machine.wait_until_succeeds("initctl status fwupd | grep running", timeout=60)
 
+      with subtest("fwupd config is installed"):
+          machine.succeed("test -f /etc/fwupd/fwupd.conf")
+
       machine.shutdown()
     '';
   };

modules/services/greetd/test.nix

@@ -16,6 +16,9 @@
       with subtest("greetd is running"):
           machine.wait_until_succeeds("initctl status greetd | grep running", timeout=30)
 
+      with subtest("greetd greeter cache directory exists"):
+          machine.succeed("test -d /var/cache/tuigreet")
+
       machine.shutdown()
     '';
   };

modules/services/illum/test.nix

@@ -15,6 +15,9 @@
       with subtest("illum is running"):
           machine.wait_until_succeeds("initctl status illum | grep running", timeout=30)
 
+      with subtest("illum finit service is configured"):
+          machine.succeed("test -f /etc/finit.d/illum.conf")
+
       machine.shutdown()
     '';
   };