fix: Added a check for vagrant.

flake.nix

@@ -1,10 +1,22 @@
 {
-  description = "A very basic flake";
+  description = "Utilities for running Laravel, particularly with Vagrant";
 
   outputs = { nixpkgs, self }: {
     nixosModules = {
       laravel = import ./nixos/modules/web-apps/laravel.nix;
       vagrant = { ... }: { imports = [ ./nixos/modules/virtualisation/vagrant.nix ]; };
     };
+
+    checks."x86_64-linux".vagrant = let pkgs = nixpkgs.legacyPackages."x86_64-linux"; in
+      pkgs.nixosTest {
+        name = "vagrant-box-test";
+        nodes.machine = { pkgs, ... }: { imports = with self.nixosModules; [ vagrant ]; };
+        testScript = ''
+          # run hello on machine and check for output
+          machine.succeed('hello | grep "Hello, world!"')
+          machine.succeed('goodbye | grep "Hello, world!"')
+          # test is a simple python script
+        '';
+      };
   };
 }