anchor.diff:  , fetchFromGitHub
   , pythonOlder
   , msgpack
  -, nose
  +, pytestCheckHook
   , numpy
   , pydantic
   , pymongo
  
positive.code:   preCheck = ''
      substituteInPlace tests/test_os.py \
        --replace 'self.assertEqual("/usr/bin/find", which("/usr/bin/find"))' '#'
    '';
  
    checkPhase = ''
      runHook preCheck
      nosetests -v
      runHook postCheck
    '';
  
    meta = with lib; {
  
negative.code:   ];
  
    checkInputs = [
      pytestCheckHook
      numpy
      pydantic
      pymongo
  