anchor.diff:  , packaging
   # Check Inputs
   , pytestCheckHook
  +, pytest-subtests
   , numpy
   , matplotlib
   , uncertainties
  
positive.code:   # Test suite explicitly requires pytest
    checkInputs = [
      pytestCheckHook
      numpy
      matplotlib
      uncertainties
  
negative.code: 
  buildPythonPackage rec {
    pname = "pint";
    version = "0.18";
  
    src = fetchPypi {
      inherit version;
      pname = "Pint";
      sha256 = "sha256-jEvOiEwmkFH+t6vGnb/RhAPAx2SryD2hMuinIi+LqAE=";
    };
  
    disabled = pythonOlder "3.6";
  