anchor.diff:    # testing based on project's tox.ini
     checkPhase = ''
       pytest --doctest-modules natsort
  -    pytest --flakes --pep8 --cov natsort --cov-report term-missing
  +    pytest --flakes --pep8
     '';
   
     meta = {
  
positive.code:   pname = "natsort";
    version = "5.2.0";
  
    buildInputs = [
      hypothesis
      pytestcache
      pytestcov
      pytestflakes
      pytestpep8
      pytest
  
negative.code: { lib
  , buildPythonPackage
  , pythonOlder
  , fetchPypi
  , hypothesis
  , pytestcache
  , pytestflakes
  , pytestpep8
  , pytest
  