Checks: add nixosIntegration test example to hello-service

clanServices/hello-world/default.nix

@@ -5,4 +5,19 @@
   manifest.name = "clan-core/hello-word";
 
   roles.peer = { };
+
+  perMachine =
+    { machine, ... }:
+    {
+      nixosModule = {
+        clan.core.vars.generators.hello = {
+          files.hello = {
+            secret = false;
+          };
+          script = ''
+            echo "Hello world from ${machine.name}" > $out/hello
+          '';
+        };
+      };
+    };
 }

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:
@@ -33,5 +33,18 @@ in
     in
     {
       imports = [ unit-test-module ];
+
+      /**
+        1. Prepare the test vars
+        nix run .#generate-test-vars -- clanServices/hello-world/tests/vm hello-service
+
+        2. To run the test
+        nix build .#checks.x86_64-linux.hello-service
+      */
+      checks.hello-service = import ./tests/vm/default.nix {
+        inherit module;
+        inherit self inputs pkgs;
+        clanLib = self.clanLib;
+      };
     };
 }

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

@@ -0,0 +1,42 @@
+{
+  pkgs,
+  self,
+  clanLib,
+  module,
+  ...
+}:
+clanLib.test.makeTestClan {
+  inherit pkgs self;
+  nixosTest = (
+    { ... }:
+    {
+      name = "service-hello-test";
+
+      clan = {
+        directory = ./.;
+        inventory = {
+          machines.peer1 = { };
+
+          instances."test" = {
+            module.name = "hello-service";
+            roles.peer.machines.peer1 = { };
+          };
+
+          modules = {
+            hello-service = module;
+          };
+        };
+      };
+
+      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
+        '';
+    }
+  );
+}

clanServices/hello-world/tests/vm/sops/users/admin/key.json

@@ -0,0 +1,4 @@
+{
+  "publickey": "age1qm0p4vf9jvcnn43s6l4prk8zn6cx0ep9gzvevxecv729xz540v8qa742eg",
+  "type": "age"
+}

clanServices/hello-world/tests/vm/vars/per-machine/peer1/hello/hello/value

@@ -0,0 +1 @@
+Hello world from peer1

lib/test/sops.nix

@@ -4,13 +4,17 @@
   # configures a static age-key to skip the age-key generation
   sops.age.keyFile = "/run/age-key.txt";
   system.activationScripts =
+    let
+      # https://github.com/Mic92/sops-nix/blob/61154300d945f0b147b30d24ddcafa159148026a/modules/sops/default.nix#L27
+      hasRegularSecrets = lib.filterAttrs (_: v: v.neededForUsers) config.sops.secrets != { };
+    in
     {
-      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 != { }) {
+    // lib.optionalAttrs (hasRegularSecrets) {
+      setupSecrets.deps = [ "age-key" ];
       setupSecretsForUsers.deps = [ "age-key" ];
     };
 }