anchor.diff:      pyyaml
     ];
   
  -  checkInputs = [ pytest mock ];
  +  checkInputs = [
  +    pytestCheckHook
  +    mock
  +  ];
   
  -  checkPhase = ''
  -    pytest tests/unit
  +  postPatch = ''
  +    substituteInPlace setup.py \
  +      --replace "pyyaml~=5.1" "pyyaml" \
  +      --replace "boto3~=1.9, >=1.9.56" "boto3"
     '';
  +
  +  pytestFlagsArray = [
  +    "tests/unit"
  +  ];
  +
  +  pythonImportsCheck = [
  +    "serverlessrepo"
  +  ];
   
     meta = with lib; {
       homepage = "https://github.com/awslabs/aws-serverlessrepo-python";
  
positive.code:       A Python library with convenience helpers for working with the
        AWS Serverless Application Repository.
      '';
      license = lib.licenses.asl20;
      maintainers = with maintainers; [ dhkl ];
    };
  }
  
negative.code: { lib
  , buildPythonPackage
  , fetchPypi
  , pytestCheckHook
  , boto3
  , six
  , pyyaml
  , mock
  , pythonOlder
  }:
  
  buildPythonPackage rec {
    pname = "serverlessrepo";
    version = "0.1.10";
    format = "setuptools";
  
    disabled = pythonOlder "3.7";
  
    src = fetchPypi {
      inherit pname version;
  