chore(lib/select): move into subfolder with a test file

lib/default.nix

@@ -29,6 +29,6 @@ lib.fix (clanLib: {
   modules = clanLib.callLib ./inventory/frontmatter { };
   values = import ./introspection { inherit lib; };
   jsonschema = import ./jsonschema { inherit lib; };
-  select = import ./select.nix;
+  select = import select/default.nix;
   facts = import ./facts.nix { inherit lib; };
 })

lib/flake-module.nix

@@ -8,9 +8,10 @@ rec {
   # TODO: automatically generate this from the directory conventions
   imports = [
     ./build-clan/flake-module.nix
+    ./introspection/flake-module.nix
     ./inventory/flake-module.nix
     ./jsonschema/flake-module.nix
-    ./introspection/flake-module.nix
+    ./select/flake-module.nix
   ];
   flake.clanLib = import ./default.nix {
     inherit lib inputs self;

lib/select/flake-module.nix

@@ -0,0 +1,44 @@
+{ self, inputs, ... }:
+let
+  inputOverrides = builtins.concatStringsSep " " (
+    builtins.map (input: " --override-input ${input} ${inputs.${input}}") (builtins.attrNames inputs)
+  );
+in
+{
+  perSystem =
+    {
+      pkgs,
+      lib,
+      system,
+      ...
+    }:
+    {
+      # Run: nix-unit --extra-experimental-features flakes --flake .#legacyPackages.x86_64-linux.evalTests
+      legacyPackages.evalTests-select = import ./tests.nix {
+        inherit lib;
+        inherit (self) clanLib;
+      };
+
+      checks = {
+        lib-select-eval = pkgs.runCommand "tests" { nativeBuildInputs = [ pkgs.nix-unit ]; } ''
+          export HOME="$(realpath .)"
+          export NIX_ABORT_ON_WARN=1
+          nix-unit --eval-store "$HOME" \
+            --extra-experimental-features flakes \
+            ${inputOverrides} \
+            --flake ${
+              self.filter {
+                include = [
+                  "flakeModules"
+                  "lib"
+                  "clanModules/flake-module.nix"
+                  "clanModules/borgbackup"
+                ];
+              }
+            }#legacyPackages.${system}.evalTests-select
+
+          touch $out
+        '';
+      };
+    };
+}

lib/select/tests.nix

@@ -0,0 +1,4 @@
+{ clanLib }:
+{
+
+}