{
  pkgs,
  nixosModules,
}:

pkgs.testers.nixosTest {
  name = "agregators-simple-test";

  nodes.machine =
    {
      config,
      pkgs,
      ...
    }:
    {
      imports = [ nixosModules.default ];

      networking.firewall.enable = false;

      virtualisation.memorySize = 4096;
      virtualisation.diskSize = 8192;

      services.agregators = {
        enable = true;
        mediaDir = "/data/music";

        # No VPN in test — no WireGuard endpoint to connect to
        # qbittorrent.vpn.enable is false by implication

        qbittorrent = {
          enable = true;
          vpn.enable = false;
        };

        jackett.enable = true;

        metadata-agregator = {
          enable = true;
          package = config.services.agregators.music-agregator.package;
          # In real usage this would be the actual metadata-agregator package.
          # For the simple test we just check the module evaluates and
          # systemd units are created. The service itself won't start
          # without the real binary — that's fine, we test structure here.
        };

        musicfs = {
          enable = true;
          package = config.services.agregators.music-agregator.package;
        };

        music-agregator = {
          enable = true;
          package = pkgs.hello; # placeholder — real package tested separately
          jackettApiKeyFile = "/dev/null";
        };
      };
    };

  testScript = ''
    machine.wait_for_unit("multi-user.target")

    # PostgreSQL should be running with both databases
    machine.succeed("systemctl is-active postgresql")
    machine.succeed("sudo -u postgres psql -lqt | grep -q music_agregator")
    machine.succeed("sudo -u postgres psql -lqt | grep -q metadata_agregator")

    # Schema init oneshots should have completed
    machine.succeed("systemctl is-active agregators-schema-music")
    machine.succeed("systemctl is-active agregators-schema-metadata")

    # Verify schemas were applied (marker files exist)
    machine.succeed("test -f /var/lib/agregators/postgres/.schema-music-initialized")
    machine.succeed("test -f /var/lib/agregators/postgres/.schema-metadata-initialized")

    # Verify tables exist in music_agregator
    machine.succeed("sudo -u music_agregator psql -d music_agregator -c 'SELECT 1 FROM river_job LIMIT 0'")
    machine.succeed("sudo -u music_agregator psql -d music_agregator -c 'SELECT 1 FROM artists LIMIT 0'")
    machine.succeed("sudo -u music_agregator psql -d music_agregator -c 'SELECT 1 FROM workflow_runs LIMIT 0'")

    # Verify tables exist in metadata_agregator
    machine.succeed("sudo -u metadata_agregator psql -d metadata_agregator -c 'SELECT 1 FROM artists LIMIT 0'")
    machine.succeed("sudo -u metadata_agregator psql -d metadata_agregator -c 'SELECT 1 FROM albums LIMIT 0'")

    # Verify extensions
    machine.succeed("sudo -u metadata_agregator psql -d metadata_agregator -c \"SELECT 1 FROM pg_extension WHERE extname='pg_trgm'\" | grep -q 1")

    # qBittorrent should be running (no VPN in test)
    machine.succeed("systemctl is-active qbittorrent")

    # Jackett should be running
    machine.succeed("systemctl is-active jackett")

    # Directories should exist with correct ownership
    machine.succeed("test -d /data/music")
    machine.succeed("test -d /data/music/downloads")
    machine.succeed("test -d /var/lib/agregators")

    # Verify the agregators user/group exist
    machine.succeed("id agregators")
    machine.succeed("getent group agregators")

    print("\n=== Agregators Simple Test Completed ===")
  '';
}