anchor.diff:      freezegun
       mock
       nose
  +    pytest-xdist
  +    pytestCheckHook
     ];
   
  -  doCheck = true;
  +  postPatch = ''
  +    substituteInPlace setup.py \
  +      --replace "lz4<=3.0.1" "lz4<=4"
  +  '';
  +
  +  # remove source to prevent pytest testing source instead of the build artifacts
  +  # (the source doesn't contain the extension modules)
  +  preCheck = ''
  +    rm -rf clickhouse_driver
  +  '';
  +
  +  # some test in test_buffered_reader.py doesn't seem to return
  +  disabledTestPaths = [ "tests/test_buffered_reader.py" ];
  +
  +  pytestFlagsArray = [ "-n" "$NIX_BUILD_CORES" ];
  +
  +  # most tests require `clickhouse`
  +  # TODO: enable tests after `clickhouse` unbroken
  +  doCheck = false;
  +
     pythonImportsCheck = [ "clickhouse_driver" ];
   
     meta = with lib; {
  
positive.code: { lib
  , buildPythonPackage
  , fetchPypi
  , setuptools
  , pytz
  , tzlocal
  
negative.code: , freezegun
  , mock
  , nose
  , pytestCheckHook
  , pytest-xdist
  }:
  
  buildPythonPackage rec {
    pname = "clickhouse-driver";
    version = "0.2.0";
  
    # pypi source doesn't contain tests
    src = fetchFromGitHub {
      owner = "mymarilyn";
      repo = "clickhouse-driver";
      rev = "96b7ba448c63ca2670cc9aa70d4a0e08826fb650";
      sha256 = "sha256-HFKUxJOlBCVlu7Ia8heGpwX6+HdKuwSy92s3v+GKGwE=";
    };
  
    propagatedBuildInputs = [
  