clanServices: add test to ensure nixosModule is imported

lib/modules/inventory/distributed-service/tests/default.nix

@@ -288,6 +288,7 @@ in
       ];
     };
 
+  machine_imports = import ./machine_imports.nix { inherit lib clanLib; };
   per_machine_args = import ./per_machine_args.nix { inherit lib callInventoryAdapter; };
   per_instance_args = import ./per_instance_args.nix { inherit lib callInventoryAdapter; };
   nested = import ./nested_services { inherit lib clanLib; };

lib/modules/inventory/distributed-service/tests/machine_imports.nix

@@ -0,0 +1,49 @@
+{ lib, clanLib }:
+let
+  clan = clanLib.clan {
+    self = { };
+    directory = ./.;
+
+    machines.jon = { };
+    machines.sara = { };
+    # A module that adds exports perMachine
+    modules.A =
+      { ... }:
+      {
+        manifest.name = "A";
+        roles.peer.perInstance =
+          { ... }:
+          {
+            nixosModule = {
+              options.bar = lib.mkOption {
+                default = 1;
+              };
+            };
+          };
+        roles.server = { };
+        perMachine =
+          { ... }:
+          {
+            nixosModule = {
+              options.foo = lib.mkOption {
+                default = 1;
+              };
+            };
+          };
+      };
+    inventory.instances.A = {
+      module.input = "self";
+      roles.peer.tags.all = { };
+    };
+  };
+in
+{
+  test_1 = {
+    inherit clan;
+    expr = { inherit (clan.config.clanInternals.machines.x86_64-linux.jon.config) bar foo; };
+    expected = {
+      foo = 1;
+      bar = 1;
+    };
+  };
+}