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

@@ -1,44 +1,29 @@
 {
-  pkgs,
-  nixosLib,
-  clan-core,
   module,
   ...
 }:
-nixosLib.runTest (
-  { ... }:
-  {
-    imports = [
-      clan-core.modules.nixosVmTest.clanTest
-    ];
+{
+  name = "hello-service";
 
-    hostPkgs = pkgs;
+  clan = {
+    directory = ./.;
+    inventory = {
+      machines.peer1 = { };
 
-    name = "hello-service";
-
-    clan = {
-      directory = ./.;
-      modules = {
-        hello-service = module;
-      };
-      inventory = {
-        machines.peer1 = { };
-
-        instances."test" = {
-          module.name = "hello-service";
-          roles.peer.machines.peer1 = { };
-        };
+      instances."test" = {
+        module.name = "hello-service";
+        roles.peer.machines.peer1 = { };
       };
     };
+  };
 
-    testScript =
-      { nodes, ... }:
-      ''
-        start_all()
+  testScript =
+    { nodes, ... }:
+    ''
+      start_all()
 
-        # peer1 should have the 'hello' file
-        value = peer1.succeed("cat ${nodes.peer1.clan.core.vars.generators.hello.files.hello.path}")
-        assert value.strip() == "Hello world from peer1", value
-      '';
-  }
-)
+      # peer1 should have the 'hello' file
+      value = peer1.succeed("cat ${nodes.peer1.clan.core.vars.generators.hello.files.hello.path}")
+      assert value.strip() == "Hello world from peer1", value
+    '';
+}