python3Packages.grpc_google_iam_v1: disable awkward tests

pkgs/development/python-modules/grpc_google_iam_v1/default.nix

@@ -3,6 +3,7 @@
 , fetchPypi
 , grpcio
 , googleapis_common_protos
+, pytest
 }:
 
 buildPythonPackage rec {
@@ -16,6 +17,11 @@ buildPythonPackage rec {
 
   propagatedBuildInputs = [ grpcio googleapis_common_protos ];
 
+  # non-standard test format, and python3 will load local google folder first
+  # but tests cannot be ran if google folder is removed or moved
+  doCheck = false;
+  checkInputs = [ pytest ];
+
   meta = with stdenv.lib; {
     description = "GRPC library for the google-iam-v1 service";
     homepage = https://github.com/googleapis/googleapis;