inventory: make resolve module a clanLib function

Unclutter inventory logic

lib/flake-module.nix

@@ -4,6 +4,9 @@
   self,
   ...
 }:
+let
+  inputOverrides = self.clanLib.flake-inputs.getOverrides inputs;
+in
 rec {
   # TODO: automatically generate this from the directory conventions
   imports = [
@@ -19,4 +22,47 @@ rec {
   };
   # TODO: remove this legacy alias
   flake.lib = flake.clanLib;
+
+  perSystem =
+    {
+      pkgs,
+      lib,
+      system,
+      ...
+    }:
+    let
+      # Common filtered source for module tests
+      inventoryTestsSrc = lib.fileset.toSource {
+        root = ../.;
+        fileset = lib.fileset.unions [
+          ../flake.nix
+          ../flake.lock
+          ../lib
+          (lib.fileset.fileFilter (file: file.name == "flake-module.nix") ../.)
+          ../flakeModules
+          # ../../nixosModules/clanCore
+          # ../../machines
+          # ../../inventory.json
+        ];
+      };
+    in
+    {
+      legacyPackages.eval-tests-resolve-module = import ./resolve-module/test.nix {
+        inherit lib;
+      };
+
+      checks = {
+        eval-lib-resolve-module = pkgs.runCommand "tests" { nativeBuildInputs = [ pkgs.nix-unit ]; } ''
+          export HOME="$(realpath .)"
+          nix-unit --eval-store "$HOME" \
+            --extra-experimental-features flakes \
+            --show-trace \
+            ${inputOverrides} \
+            --flake ${inventoryTestsSrc}#legacyPackages.${system}.eval-tests-resolve-module
+
+          touch $out
+        '';
+      };
+    };
+
 }