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{
  system ? builtins.currentSystem
, pkgs ? import ../.. { inherit system; }
, package
}:
import ./make-test-python.nix ({ pkgs, lib, ... }: let
  testPath = pkgs.hello;
in {
  name = "varnish";
  meta = {
    maintainers = lib.teams.helsinki-systems.members;
  };

  nodes = {
    varnish = { config, pkgs, ... }: {
        services.nix-serve = {
          enable = true;
        };

        services.varnish = {
          inherit package;
          enable = true;
          http_address = "0.0.0.0:80";
          config = ''
            vcl 4.0;

            backend nix-serve {
              .host = "127.0.0.1";
              .port = "${toString config.services.nix-serve.port}";
            }
          '';
        };

        networking.firewall.allowedTCPPorts = [ 80 ];
        system.extraDependencies = [ testPath ];
      };

    client = { lib, ... }: {
      nix.settings = {
        require-sigs = false;
        substituters = lib.mkForce [ "http://varnish" ];
      };
    };
  };

  testScript = ''
    start_all()
    varnish.wait_for_open_port(80)

    client.wait_until_succeeds("curl -f http://varnish/nix-cache-info");

    client.wait_until_succeeds("nix-store -r ${testPath}");
    client.succeed("${testPath}/bin/hello");
  '';
})