Add basic unit test that evlauates the module

flake.nix

@@ -39,6 +39,30 @@
           '';
         };
       };
+
+      checks.${system}.test-module = let
+        test-lib = import "${nixpkgs}/nixos/lib/testing-python.nix" {
+          inherit system;
+        };
+      in
+        test-lib.makeTest {
+          name = "inquisitor-test-module";
+          nodes = {
+            host = { ... }: {
+              imports = [ self.nixosModules.default ];
+              services.inquisitor.enable = true;
+            };
+          };
+          testScript = ''
+            start_all()
+            host.wait_for_unit("multi-user.target")
+            # Check that the setup script ran
+            host.succeed("[ -e /var/lib/inquisitor ]")
+            # Check that the service came up
+            host.succeed("systemctl is-enabled inquisitor")
+            host.succeed("systemctl is-active inquisitor")
+          '';
+        };
     };
   in (my-flake.outputs-for each systems) // {
     overlays.default = final: prev: {

module.nix

@@ -31,7 +31,7 @@ in
   config =
   let
     # Get the inquisitor package from the flake.
-    inquisitor = flake.packages.${pkgs.stdenv.hostPlatform.system}.default;
+    inquisitor = flake.packages.${pkgs.stdenv.hostPlatform.system}.env;
 
     # Define the inquisitor state directory.
     stateDir = "/var/lib/inquisitor";
@@ -80,7 +80,7 @@ in
       if [ -f ${stateDir}/scp-helper ]; then
         ${pkgs.coreutils}/bin/rm ${stateDir}/scp-helper
       fi
-      ln -s -t ${stateDir}/scp-helper ${scp-helper}/bin/scp-helper
+      ln -s -t ${stateDir} ${scp-helper}/bin/scp-helper
     '';
 
     # Create a run script for the service.