make it eval

examples/default.nix

@@ -0,0 +1,32 @@
+{ nixpkgs, system, buildbot-nix, ... }:
+let
+  # some example configuration to make it eval
+  dummy = { config, ... }: {
+    networking.hostName = "example-common";
+    system.stateVersion = config.system.nixos.version;
+    users.users.root.initialPassword = "fnord23";
+    boot.loader.grub.devices = lib.mkForce [ "/dev/sda" ];
+    fileSystems."/".device = lib.mkDefault "/dev/sda";
+  };
+
+  inherit (nixpkgs) lib;
+  inherit (lib) nixosSystem;
+
+in
+{
+  # General
+  example-master = nixosSystem {
+    inherit system;
+    modules = [
+      dummy
+      buildbot-nix.nixosModules.buildbot-master
+    ];
+  };
+  example-worker = nixosSystem {
+    inherit system;
+    modules = [
+      dummy
+      buildbot-nix.nixosModules.buildbot-worker
+    ];
+  };
+}

flake.nix

@@ -7,14 +7,24 @@
     flake-parts.url = "github:hercules-ci/flake-parts";
   };
 
-  outputs = inputs@{ flake-parts, ... }:
+  outputs = inputs@{ self, flake-parts, ... }:
     flake-parts.lib.mkFlake { inherit inputs; } ({ lib, ... }: {
       systems = lib.systems.flakeExposed;
       flake = {
         nixosModules.buildbot-master = ./nix/master.nix;
         nixosModules.buildbot-worker = ./nix/worker.nix;
+
+        nixosConfigurations = import ./examples {
+          inherit (inputs) nixpkgs;
+          buildbot-nix = self;
+          system = "x86_64-linux";
+        };
+        checks.x86_64-linux = {
+          nixos-master = self.nixosConfigurations.example-master.config.system.build.toplevel;
+          nixos-worker = self.nixosConfigurations.example-worker.config.system.build.toplevel;
+        };
       };
-      perSystem = { pkgs, ... }: {
+      perSystem = { pkgs, system, ... }: {
         packages.default = pkgs.mkShell {
           packages = [
             pkgs.bashInteractive