metricbeat7: fix `passthru.tests`

{ lib, fetchFromGitHub, elk7Version, buildGoModule, libpcap, nixosTests, systemd }:

{ lib, fetchFromGitHub, elk7Version, buildGoModule, libpcap, nixosTests, systemd, config }:

let beat = package: extraArgs: buildGoModule (rec {

  pname = package;

  metricbeat7 = beat "metricbeat" {

    meta.description = "Lightweight shipper for metrics";

    passthru.tests =

      assert metricbeat7.drvPath == nixosTests.elk.ELK-7.elkPackages.metricbeat.drvPath;

      lib.optionalAttrs config.allowUnfree (

        assert metricbeat7.drvPath == nixosTests.elk.unfree.ELK-7.elkPackages.metricbeat.drvPath;

        {

        elk = nixosTests.elk.ELK-7;

      };

          elk = nixosTests.elk.unfree.ELK-7;

        }

      );

  };

  packetbeat7 = beat "packetbeat" {

    buildInputs = [ libpcap ];