let
  port = 8082;
in
import <nixpkgs/nixos/tests/make-test-python.nix> ({ pkgs, ... }:
{
  nodes = {
    server = {
      imports = [ ./module.nix ];

      services.bang-evaluator = {
        enable = true;
        listenAddress = ":${toString port}";
      };

      networking.firewall.allowedTCPPorts = [ port ];
    };
    client = { };
  };

  testScript = ''
    from urllib.parse import urlencode


    def evalSearch(query, engine="https://duckduckgo.com/?q=%s"):
        query_params = {
            "query": query,
            "engine": engine,
        }
        return client.succeed(
            " ".join(
                [
                    "${pkgs.curl}/bin/curl",
                    "-s",
                    "-o/dev/null",
                    "-w",
                    "%{redirect_url}",
                    f"'http://server:${toString port}/eval?{urlencode(query_params)}'",
                ]
            )
        )


    start_all()
    server.wait_for_open_port(${toString port})
    client.wait_for_unit("multi-user.target")

    assert evalSearch("foo") == "https://duckduckgo.com/?q=foo"
    assert evalSearch("foo !wde") == "https://de.wikipedia.org/w/index.php?search=foo"
    assert evalSearch("!wde foo") == "https://de.wikipedia.org/w/index.php?search=foo"
    assert (
        evalSearch("foo", engine="https://startpage.com/sp/search?query=%s")
        == "https://startpage.com/sp/search?query=foo"
    )
  '';
})