anchor.diff:  { lib
   , buildPythonPackage
   , fetchPypi
  -, isPy27
   , mock
   , pytestCheckHook
  +, pythonAtLeast
  +, pythonOlder
   , sybil
   , twisted
   , zope_component
  
positive.code:   };
  
    checkInputs = [
      pytestCheckHook
      mock
      sybil
      zope_component
      twisted
    ];
  
    doCheck = !isPy27;
  
    disabledTestPaths = [
      # Django is too much hasle to setup at the moment
      "testfixtures/tests/test_django"
    ];
  
    pytestFlagsArray = [
      "testfixtures/tests"
    ];
  
    pythonImportsCheck = [ "testfixtures" ];
  
    meta = with lib; {
      homepage = "https://github.com/Simplistix/testfixtures";
      description = "A collection of helpers and mock objects for unit tests and doc tests";
      license = licenses.mit;
      maintainers = with maintainers; [ siriobalmelli ];
    };
  
negative.code: buildPythonPackage rec {
    pname = "testfixtures";
    version = "6.18.3";
    format = "setuptools";
  
    disabled = pythonOlder "3.6";
  
    src = fetchPypi {
      inherit pname version;
  