tests: Add a test for nix-darwin modules (#909)

flake-modules/tests.nix

@@ -53,6 +53,15 @@
           .system
           .build
           .toplevel;
+      }
+      // pkgs.lib.optionalAttrs pkgs.stdenv.isDarwin {
+        darwin-module =
+          (import ../tests/modules/darwin.nix {
+            inherit system;
+            inherit (inputs) nix-darwin;
+            nixvim = self;
+          })
+          .system;
       };
   };
 }

flake.lock

@@ -95,6 +95,26 @@
         "type": "github"
       }
     },
+    "nix-darwin": {
+      "inputs": {
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1704277720,
+        "narHash": "sha256-meAKNgmh3goankLGWqqpw73pm9IvXjEENJloF0coskE=",
+        "owner": "lnl7",
+        "repo": "nix-darwin",
+        "rev": "0dd382b70c351f528561f71a0a7df82c9d2be9a4",
+        "type": "github"
+      },
+      "original": {
+        "owner": "lnl7",
+        "repo": "nix-darwin",
+        "type": "github"
+      }
+    },
     "nixpkgs": {
       "locked": {
         "lastModified": 1704194953,
@@ -141,6 +161,7 @@
       "inputs": {
         "flake-parts": "flake-parts",
         "home-manager": "home-manager",
+        "nix-darwin": "nix-darwin",
         "nixpkgs": "nixpkgs",
         "pre-commit-hooks": "pre-commit-hooks"
       }

flake.nix

@@ -7,6 +7,10 @@
       url = "github:nix-community/home-manager";
       inputs.nixpkgs.follows = "nixpkgs";
     };
+    nix-darwin = {
+      url = "github:lnl7/nix-darwin";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
 
     flake-parts = {
       url = "github:hercules-ci/flake-parts";

tests/modules/darwin.nix

@@ -0,0 +1,17 @@
+{
+  nixvim,
+  system,
+  nix-darwin,
+}:
+nix-darwin.lib.darwinSystem {
+  modules = [
+    {
+      nixpkgs.hostPlatform = system;
+
+      programs.nixvim = {
+        enable = true;
+      };
+    }
+    nixvim.nixDarwinModules.nixvim
+  ];
+}