anchor.diff:  , termcolor
   , unicodecsv
   , werkzeug
  -, pytest
  +, pytestCheckHook
   , freezegun
   , mkYarnPackage
   }:
  
positive.code:    airflow version
     airflow db init
     airflow db reset -y
  
     pytest tests/core/test_core.py
    '';
  
    postInstall = ''
      cp -rv ${airflow-frontend}/static/dist $out/lib/${python.libPrefix}/site-packages/airflow/www/static
  
negative.code: 
    checkInputs = [
      freezegun
      pytestCheckHook
    ];
  
    INSTALL_PROVIDERS_FROM_SOURCES = "true";
  