add test/debug VM capability

flake.nix

@@ -11,6 +11,8 @@
       let
         pkgs = nixpkgs.legacyPackages.${system};
 
+        nixos-lib = import (nixpkgs + "/nixos/lib") {};
+
         haskellPackages = pkgs.haskellPackages;
 
         jailbreakUnbreak = pkg:
@@ -18,14 +20,21 @@
 
         packageName = "vulkan-tutorial";
       in rec {
-        packages.${packageName} = # (ref:haskell-package-def)
-          haskellPackages.callCabal2nix packageName self rec {
-            # Dependency overrides go here
-            wavefront = jailbreakUnbreak haskellPackages.wavefront;
+        packages = rec {
+          vulkan-tutorial = # (ref:haskell-package-def)
+            haskellPackages.callCabal2nix packageName self rec {
+              # Dependency overrides go here
+              wavefront = jailbreakUnbreak haskellPackages.wavefront;
           };
+          test = import ./test.nix {inherit pkgs vulkan-tutorial;};
 
         defaultPackage = self.packages.${system}.${packageName};
 
+        checks = {
+          test = import ./test.nix {inherit pkgs; vulkan-tutorial = packages.vulkan-tutorial;};
+          #test = flake-utils.lib.mkApp ({ drv = self.packages.${system}.test; });
+        };
+
         devShell = haskellPackages.shellFor {
           packages = p: [ defaultPackage ];
           withHoogle = true;

test.nix

@@ -0,0 +1,46 @@
+{pkgs, vulkan-tutorial, ...}:
+pkgs.nixosTest ({
+  name = "test";
+  nodes = {
+    machine = { config, pkgs, ...}: {
+      environment = {
+        systemPackages = with pkgs; [
+          vulkan-tutorial
+          git
+          shaderc
+          vulkan-loader
+          vulkan-validation-layers
+        ];
+        sessionVariables = {
+          VK_LAYER_PATH="${pkgs.vulkan-validation-layers}/share/vulkan/explicit_layer.d";
+          SDL_VULKAN_LIBRARY="${pkgs.vulkan-loader}/lib/libvulkan.so";
+        };
+      };
+      hardware.opengl = {
+        enable = true;
+        driSupport = true;
+        driSupport32Bit = true;
+      };
+      services.xserver = {
+        enable = true;
+        displayManager.sddm.enable = true;
+        desktopManager.cinnamon.enable = true;
+      };
+      users.users.test = {
+        password = "test";
+        extraGroups = [
+          "wheel"
+        ];
+        isNormalUser = true;
+      };
+    };
+  };
+
+  skipLint = true;
+
+  testScript = ''
+    start_all()
+
+    machine.shell_interact()
+  '';
+})