abseil-cpp_202301: install test helpers

pkgs/development/libraries/abseil-cpp/202301.nix

@@ -2,6 +2,7 @@
 , stdenv
 , fetchFromGitHub
 , cmake
+, gtest
 , static ? stdenv.hostPlatform.isStatic
 , cxxStandard ? null
 }:
@@ -18,13 +19,19 @@ stdenv.mkDerivation (finalAttrs: {
   };
 
   cmakeFlags = [
+    "-DABSL_BUILD_TEST_HELPERS=ON"
+    "-DABSL_USE_EXTERNAL_GOOGLETEST=ON"
     "-DBUILD_SHARED_LIBS=${if static then "OFF" else "ON"}"
   ] ++ lib.optionals (cxxStandard != null) [
     "-DCMAKE_CXX_STANDARD=${cxxStandard}"
   ];
 
+  strictDeps = true;
+
   nativeBuildInputs = [ cmake ];
 
+  buildInputs = [ gtest ];
+
   meta = with lib; {
     description = "An open-source collection of C++ code designed to augment the C++ standard library";
     homepage = "https://abseil.io/";