self: {
  name = "nix-cache-login-nixos-module";

  nodes.machine =
    { ... }:
    {
      imports = [ self.nixosModules.default ];
      services.nix-cache-login.enable = true;
    };

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

    # The module should install timer and service unit files for all users
    machine.succeed("test -f /etc/systemd/user/nix-cache-login.timer")
    machine.succeed("test -f /etc/systemd/user/nix-cache-login.service")

    # wantedBy = ["timers.target"] should create this symlink
    machine.succeed(
        "test -L /etc/systemd/user/timers.target.wants/nix-cache-login.timer"
    )

    # Service unit should reference the correct subcommand
    unit = machine.succeed("cat /etc/systemd/user/nix-cache-login.service")
    assert "nix-cache-login refresh" in unit, (
        f"ExecStart not found in service unit:\n{unit}"
    )
  '';
}