generic-linux-gpu: add module

tests/modules/targets-linux/generic-linux-gpu/nvidia-enabled.nix

@@ -0,0 +1,56 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+
+let
+  mockNvidiaDriver = config.lib.test.mkStubPackage {
+    buildScript = ''
+      mkdir -p $out/lib
+      echo "MOCK_NVIDIA_DRIVER_FOR_TESTING" > $out/lib/nvidia-test-marker
+    '';
+  };
+
+  # Override the package set to provide our mock driver. This also tests that a
+  # custom package set can be used with this module. The mock driver needs to
+  # support .override because the module calls it.
+  customPkgs = pkgs // {
+    linuxPackages = pkgs.linuxPackages // {
+      nvidiaPackages = pkgs.linuxPackages.nvidiaPackages // {
+        mkDriver = args: lib.makeOverridable (_: mockNvidiaDriver) { };
+      };
+    };
+  };
+in
+{
+  targets.genericLinux.gpu = {
+    enable = true;
+    packages = customPkgs;
+    nvidia = {
+      enable = true;
+      version = "550.163.01";
+      sha256 = "sha256-hfK1D5EiYcGRegss9+H5dDr/0Aj9wPIJ9NVWP3dNUC0=";
+    };
+  };
+
+  nmt.script = ''
+    setupScript="$TESTED/home-path/bin/non-nixos-gpu-setup"
+    assertFileExists "$setupScript"
+
+    # Find the resources directory
+    resourcesPath=$(grep -oP '/nix/store/[^/]+-non-nixos-gpu/resources' "$setupScript" | head -1)
+
+    # Extract the GPU environment path
+    envPath=$(grep -oP '/nix/store/[^/]+-non-nixos-gpu' "$resourcesPath/non-nixos-gpu.service" | head -1)
+
+    if [[ -z "$envPath" ]]; then
+      fail "Could not find GPU environment path in service file"
+    fi
+
+    markerFile="$envPath/lib/nvidia-test-marker"
+    assertFileExists "$markerFile"
+    assertFileContains "$markerFile" "MOCK_NVIDIA_DRIVER_FOR_TESTING"
+  '';
+}