rework victoriametrics to be more generic with test

modules/clan/victoriametrics/default.nix

@@ -0,0 +1,25 @@
+{ ... }:
+{
+  _class = "clan.service";
+  manifest.name = "Victoria Metrics";
+  manifest.description = "VictoriaMetrics: fast, cost-effective monitoring solution and time series database";
+  manifest.categories = [ "System" ];
+
+  roles.default = {
+    perInstance.nixosModule =
+      {
+        config,
+        lib,
+        ...
+      }:
+      {
+        services.victoriametrics = {
+          enable = lib.mkDefault true;
+        };
+
+        clan.core.state.victoriametrics.folders = lib.mkDefault [
+          "/var/lib/${config.services.victoriametrics.stateDir}"
+        ];
+      };
+  };
+}

modules/clan/victoriametrics/flake-module.nix

@@ -0,0 +1,19 @@
+{ lib, ... }:
+let
+  module = lib.modules.importApply ./default.nix { };
+in
+{
+  clan.modules = {
+    victoriametrics = module;
+  };
+
+  perSystem =
+    { ... }:
+    {
+      clan.nixosTests.victoriametrics = {
+        imports = [ ./tests/vm/default.nix ];
+
+        clan.modules."@clan/victoriametrics" = module;
+      };
+    };
+}

modules/clan/victoriametrics/tests/vm/default.nix

@@ -0,0 +1,34 @@
+{
+  ...
+}:
+{
+  name = "service-victoriametrics";
+
+  clan = {
+    directory = ./.;
+    inventory = {
+      machines.server = { };
+
+      instances = {
+        victoriametrics-test = {
+          module.name = "@clan/victoriametrics";
+          module.input = "self";
+          roles.default.machines."server".settings = { };
+        };
+      };
+    };
+  };
+
+  nodes = {
+    server = { };
+  };
+
+  testScript = ''
+    start_all()
+
+    server.wait_for_unit("victoriametrics")
+
+    server.succeed("systemctl status victoriametrics")
+
+  '';
+}