{
  nixos-lib,
  pkgsUnstable,
  nixpkgs-unstable,
  vhackPackages,
  pkgs,
  extraModules,
  nixLib,
  ...
}:
nixos-lib.runTest {
  hostPkgs = pkgs;

  name = "rust-motd";

  node = {
    specialArgs = {inherit pkgsUnstable extraModules vhackPackages nixpkgs-unstable nixLib;};

    # Use the nixpkgs as constructed by the `nixpkgs.*` options
    pkgs = null;
  };

  nodes = {
    server = {config, ...}: {
      imports =
        extraModules
        ++ [
          ../../../../modules
        ];

      vhack = {
        rust-motd.enable = true;
      };
    };
  };

  testScript = {nodes, ...}:
  /*
  python
  */
  ''
    from time import sleep

    start_all()

    # Give the service time to run.
    sleep(3)

    with subtest("All services running"):
      import json
      def all_services_running(host):
        (status, output) = host.systemctl("list-units --state=failed --plain --no-pager --output=json")
        host_failed = json.loads(output)
        assert len(host_failed) == 0, f"Expected zero failing services, but found: {json.dumps(host_failed, indent=4)}"
      all_services_running(server)

    with subtest("Motd generated"):
      server.succeed("cat /var/lib/rust-motd/motd | tee /dev/stderr | grep --invert-match Error")

    server.copy_from_vm("/var/lib/rust-motd/motd")
  '';
}