geos: Add `meta.pkgConfigModules` and test

pkgs/development/libraries/geos/3.9.nix

···
-{ lib, stdenv, fetchurl }:
+{ lib
+, stdenv
+, fetchurl
+, testers
+}:
 
-stdenv.mkDerivation rec {
+stdenv.mkDerivation (finalAttrs: {
   pname = "geos";
   version = "3.9.2";
 
   src = fetchurl {
-    url = "https://download.osgeo.org/geos/${pname}-${version}.tar.bz2";
+    url = "https://download.osgeo.org/geos/${finalAttrs.pname}-${finalAttrs.version}.tar.bz2";
     sha256 = "sha256-RKWpviHX1HNDa/Yhwt3MPPWou+PHhuEyKWGKO52GEpc=";
   };
 
···
 
   # https://trac.osgeo.org/geos/ticket/993
   configureFlags = lib.optional stdenv.isAarch32 "--disable-inline";
+
+  passthru.tests.pkg-config = testers.testMetaPkgConfig finalAttrs.finalPackage;
 
   meta = with lib; {
     description = "C++ port of the Java Topology Suite (JTS)";
     homepage = "https://trac.osgeo.org/geos";
     license = licenses.lgpl21Only;
+    pkgConfigModules = [ "geos" ];
     maintainers = with lib.maintainers; [
       willcohen
     ];
   };
-}
+})

pkgs/development/libraries/geos/default.nix

···
 , stdenv
 , fetchurl
 , fetchpatch
-, cmake }:
+, cmake
+, testers
+}:
 
-stdenv.mkDerivation rec {
+stdenv.mkDerivation (finalAttrs: {
   pname = "geos";
   version = "3.11.1";
 
   src = fetchurl {
-    url = "https://download.osgeo.org/geos/${pname}-${version}.tar.bz2";
+    url = "https://download.osgeo.org/geos/${finalAttrs.pname}-${finalAttrs.version}.tar.bz2";
     hash = "sha256-bQ6zz6n5LZR3Mcx18XUDVrO9/AfqAgVT2vavHHaOC+I=";
   };
 
   nativeBuildInputs = [ cmake ];
 
   doCheck = true;
+
+  passthru.tests.pkg-config = testers.testMetaPkgConfig finalAttrs.finalPackage;
 
   meta = with lib; {
     description = "C++ port of the Java Topology Suite (JTS)";
     homepage = "https://trac.osgeo.org/geos";
     license = licenses.lgpl21Only;
+    pkgConfigModules = [ "geos" ];
     maintainers = with lib.maintainers; [
       willcohen
     ];
   };
-}
+})