anchor.diff:    # allow for gunicorn processes to have access to python packages
     makeWrapperArgs = [ "--prefix PYTHONPATH : $PYTHONPATH" ];
   
  -  checkPhase = ''
  +  preCheck = ''
      export HOME=$(mktemp -d)
      export AIRFLOW_HOME=$HOME
      export AIRFLOW__CORE__UNIT_TEST_MODE=True
  
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";
  