hello-world: migrate to clan.nixosTests module

clanServices/hello-world/flake-module.nix

@@ -14,7 +14,7 @@ in
     hello-world = module;
   };
   perSystem =
-    { pkgs, ... }:
+    { ... }:
     let
       # Module that contains the tests
       # This module adds:
@@ -41,15 +41,10 @@ in
         2. To run the test
         nix build .#checks.x86_64-linux.hello-service
       */
-      checks =
-        # Currently we don't support nixos-integration tests on darwin
-        lib.optionalAttrs (pkgs.stdenv.isLinux) {
-          hello-service = import ./tests/vm/default.nix {
-            inherit module;
-            inherit self inputs pkgs;
-            nixosLib = import (self.inputs.nixpkgs + "/nixos/lib") { };
-            clan-core = self;
-          };
+      clan.nixosTests.hello-service = {
+        imports = [ ./tests/vm/default.nix ];
+
+        clan.modules.hello-service = module;
       };
     };
 }

clanServices/hello-world/tests/vm/default.nix

@@ -1,26 +1,12 @@
 {
-  pkgs,
-  nixosLib,
-  clan-core,
   module,
   ...
 }:
-nixosLib.runTest (
-  { ... }:
 {
-    imports = [
-      clan-core.modules.nixosVmTest.clanTest
-    ];
-
-    hostPkgs = pkgs;
-
   name = "hello-service";
 
   clan = {
     directory = ./.;
-      modules = {
-        hello-service = module;
-      };
     inventory = {
       machines.peer1 = { };
 
@@ -41,4 +27,3 @@ nixosLib.runTest (
       assert value.strip() == "Hello world from peer1", value
     '';
 }
-)