fix: rename folder lib/tests -> lib/test to be consistent with the attribute name

lib/test/default.nix

@@ -0,0 +1,92 @@
+{ lib, clanLib }:
+let
+  inherit (lib)
+    mkOption
+    types
+    ;
+in
+{
+  minifyModule = ./minify.nix;
+  # A function that returns an extension to runTest
+  makeTestClan =
+    {
+      nixosTest,
+      pkgs,
+      self,
+      ...
+    }:
+    let
+      nixos-lib = import (pkgs.path + "/nixos/lib") { };
+    in
+    (nixos-lib.runTest (
+      { config, ... }:
+      let
+        clanFlakeResult = config.clan;
+      in
+      {
+        imports = [ nixosTest ];
+        options = {
+          clanSettings = mkOption {
+            default = { };
+            type = types.submodule {
+              options = {
+                clan-core = mkOption { default = self; };
+                nixpkgs = mkOption { default = self.inputs.nixpkgs; };
+                nix-darwin = mkOption { default = self.inputs.nix-darwin; };
+              };
+            };
+          };
+
+          clan = mkOption {
+            default = { };
+            type = types.submoduleWith {
+              specialArgs = {
+                inherit (config.clanSettings)
+                  clan-core
+                  nixpkgs
+                  nix-darwin
+                  ;
+              };
+              modules = [
+                clanLib.buildClanModule.flakePartsModule
+              ];
+            };
+          };
+        };
+        config = {
+          nodes = clanFlakeResult.clanInternals.nixosModules;
+          hostPkgs = pkgs;
+          # speed-up evaluation
+          defaults = (
+            { config, ... }:
+            {
+              imports = [
+                clanLib.test.minifyModule
+              ];
+              documentation.enable = lib.mkDefault false;
+              nix.settings.min-free = 0;
+              system.stateVersion = config.system.nixos.release;
+              boot.initrd.systemd.enable = false;
+
+              # setup for sops
+              sops.age.keyFile = "/run/age-key.txt";
+              system.activationScripts =
+                {
+                  setupSecrets.deps = [ "age-key" ];
+                  age-key.text = ''
+                    echo AGE-SECRET-KEY-1PL0M9CWRCG3PZ9DXRTTLMCVD57U6JDFE8K7DNVQ35F4JENZ6G3MQ0RQLRV > /run/age-key.txt
+                  '';
+                }
+                // lib.optionalAttrs (lib.filterAttrs (_: v: v.neededForUsers) config.sops.secrets != { }) {
+                  setupSecretsForUsers.deps = [ "age-key" ];
+                };
+            }
+          );
+
+          # to accept external dependencies such as disko
+          _module.args = { inherit self; };
+          node.specialArgs.self = self;
+        };
+      }
+    )).config.result;
+}

lib/test/minify.nix

@@ -0,0 +1,11 @@
+# This is a module to reduce the size of the NixOS configuration
+# Used by the tests
+# It unsets some unnecessary options
+{ lib, ... }:
+{
+  nixpkgs.flake.setFlakeRegistry = false;
+  nixpkgs.flake.setNixPath = false;
+  nix.registry = lib.mkForce { };
+  documentation.doc.enable = false;
+  documentation.man.enable = false;
+}