nixos-facter: add passthru.tests

nixos/tests/all-tests.nix

@@ -512,6 +512,7 @@ in
   etebase-server = runTest ./etebase-server.nix;
   etesync-dav = runTest ./etesync-dav.nix;
   evcc = runTest ./evcc.nix;
+  facter = runTest ./facter;
   fail2ban = runTest ./fail2ban.nix;
   fakeroute = runTest ./fakeroute.nix;
   fancontrol = runTest ./fancontrol.nix;

nixos/tests/facter/default.nix

@@ -0,0 +1,29 @@
+{ lib, pkgs, ... }:
+{
+  name = "facter";
+  meta = with lib.maintainers; {
+    maintainers = [ mic92 ];
+  };
+
+  nodes.machine = {
+    hardware.facter.reportPath = ./facter.json;
+    environment.systemPackages = [ pkgs.nixos-facter ];
+  };
+
+  testScript = ''
+    from pprint import pprint
+
+    machine.wait_for_unit("multi-user.target")
+
+    with subtest("Run nixos-facter and verify it produces valid JSON"):
+      import json
+      # Run nixos-facter and check it produces valid output
+      output = machine.succeed("nixos-facter")
+      # Parse JSON to verify it's valid
+      report = json.loads(output)
+      pprint(report)
+      assert "version" in report, "Expected version field in nixos-facter output"
+      assert "system" in report, "Expected system field in nixos-facter output"
+      assert report["version"] == 1, f"Expected version 1, got {report['version']}"
+  '';
+}

nixos/tests/facter/facter.json

@@ -0,0 +1,31 @@
+{
+  "version": 1,
+  "system": "x86_64-linux",
+  "virtualisation": "kvm",
+  "hardware": {
+    "bios": {
+      "smbios_version": 520
+    },
+    "cpu": [
+      {
+        "architecture": "x86_64",
+        "vendor_name": "AuthenticAMD",
+        "family": 25,
+        "model": 33
+      }
+    ],
+    "system": {
+      "form_factor": "desktop"
+    }
+  },
+  "smbios": {
+    "bios": {
+      "vendor": "SeaBIOS",
+      "version": "test"
+    },
+    "system": {
+      "manufacturer": "QEMU",
+      "product": "Standard PC"
+    }
+  }
+}

pkgs/by-name/ni/nixos-facter/package.nix

@@ -7,6 +7,7 @@
   gcc,
   pkg-config,
   makeWrapper,
+  nixosTests,
   stdenv,
   systemdMinimal,
 }:
@@ -61,6 +62,10 @@ buildGoModule rec {
     "-X github.com/numtide/nixos-facter/pkg/build.System=${stdenv.hostPlatform.system}"
   ];
 
+  passthru.tests = {
+    inherit (nixosTests) facter;
+  };
+
   meta = {
     description = "Declarative hardware configuration for NixOS";
     homepage = "https://github.com/numtide/nixos-facter";