anchor.diff:  , fetchPypi
   , importlib-metadata
   , logfury
  +, pyfakefs
   , pytestCheckHook
   , pytest-lazy-fixture
   , pytest-mock
  
positive.code:     substituteInPlace requirements.txt \
        --replace 'arrow>=0.8.0,<1.0.0' 'arrow'
    '';
  
    disabledTests = [
      # Test requires an API key
  
negative.code:     pytestCheckHook
      pytest-lazy-fixture
      pytest-mock
      pyfakefs
    ];
  
    postPatch = ''
  