nixos machine tests

nix/module.nix

@@ -0,0 +1,71 @@
+self: {
+  config,
+  pkgs,
+  lib,
+  ...
+}: let
+  inherit (lib) mkEnableOption mkOption mkIf types;
+
+  cfg = config.services.pi-air-quality-monitor;
+in {
+  options.services.pi-air-quality-monitor = {
+    enable = mkEnableOption "pi-air-quality-monitor";
+    package = mkOption {
+      type = types.package;
+      default = self.packages.${pkgs.system}.pi-air-quality-monitor;
+    };
+    openFirewall = mkOption {
+      type = types.bool;
+      default = true;
+      description = "Whether to open the firewall for the server";
+    };
+
+    settings = {
+      port = mkOption {
+        type = types.int;
+        default = 8080;
+        description = "Port to run the server on";
+      };
+
+      user = mkOption {
+        type = types.str;
+        default = "pi-aqm";
+        description = "User to run the server as";
+      };
+
+      group = mkOption {
+        type = types.str;
+        default = "pi-aqm";
+        description = "Group to run the server as";
+      };
+    };
+  };
+
+  config = mkIf config.services.pi-air-quality-monitor.enable {
+    networking.firewall.allowedTCPPorts = [cfg.settings.port];
+    users = {
+      users.pi-aqm = {
+        isSystemUser = true;
+        group = "pi-aqm";
+        home = "/var/lib/pi-aqm";
+        createHome = true;
+      };
+
+      groups.pi-aqm = {};
+    };
+
+    systemd.services."pi-air-quality-monitor" = {
+      description = "An air quality monitoring service with a Raspberry Pi and a SDS011 sensor";
+      wantedBy = ["multi-user.target"];
+      after = ["network.target"];
+      serviceConfig = {
+        Type = "simple";
+        User = cfg.settings.user;
+        Group = cfg.settings.group;
+        WorkingDirectory = "/var/lib/pi-aqm";
+        ExecStart = "${lib.getExe cfg.package}";
+        Restart = "always";
+      };
+    };
+  };
+}

nix/tests/checks/basic.nix

@@ -0,0 +1,56 @@
+{
+  nixosTest,
+  self,
+  ...
+}:
+nixosTest {
+  name = "basic";
+
+  nodes = {
+    client = {pkgs, ...}: {
+      imports = [../profiles/test-setup.nix];
+
+      environment.systemPackages = with pkgs; [
+        netcat
+      ];
+    };
+
+    server = {pkgs, ...}: {
+      imports = [
+        ../profiles/test-setup.nix
+        self.nixosModules.pi-air-quality-monitor
+      ];
+
+      users.users.test = {
+        isNormalUser = true;
+        extraGroups = ["wheel"];
+        packages = with pkgs; [
+          tree
+        ];
+      };
+
+      services.pi-air-quality-monitor = {
+        enable = true;
+        openFirewall = true;
+
+        settings = {
+          port = 8080;
+          user = "pi-aqm";
+          group = "pi-aqm";
+        };
+      };
+
+      system.stateVersion = "23.11";
+    };
+  };
+
+  testScript = ''
+    server.wait_for_unit("default.target")
+    server.succeed("ls -lah /dev/ttyUSB0")
+    server.succeed('systemctl status pi-air-quality-monitor | grep \"Active: active (running)\" || return 0')
+    #server.succeed('nc -vz server 8080')
+
+    #client.wait_for_unit("default.target")
+    #client.succeed("nc -vz server 8080")
+  '';
+}

nix/tests/default.nix

@@ -0,0 +1,26 @@
+{
+  self,
+  config,
+  inputs,
+  lib,
+  ...
+}: {
+  perSystem = {
+    pkgs,
+    self',
+    ...
+  }: let
+    callPackage = lib.callPackageWith (pkgs
+      // {
+        inherit (config.flake) nixosModules;
+        inherit inputs;
+      });
+  in {
+    packages.test = self'.checks.basic.driverInteractive;
+
+    checks = {
+      basic = callPackage ./checks/basic.nix {inherit self;};
+      default = self'.checks.basic;
+    };
+  };
+}

nix/tests/profiles/test-setup.nix

@@ -0,0 +1,12 @@
+{
+  virtualisation = {
+    cores = 2;
+    memorySize = 1024;
+    qemu.options = [
+      "-nographic"
+      "-vga none -enable-kvm"
+      "-device virtio-gpu-pci,xres=720,yres=1440"
+      "-serial pty"
+    ];
+  };
+}