anchor.diff:            fi
           '' + postInstall;
   
  +        checkPhase =
  +          if checkPhase != null
  +            then checkPhase
  +            else ''
  +              export LANG=en_US.UTF-8
  +              export LOCALE_ARCHIVE=${glibcLocales}/lib/locale/locale-archive
  +              export APP_TESTING=${name}
  +
  +              flake8 --exclude=nix_run_setup.py,migrations/,build/
  +              pytest tests/
  +            '';
  +
           shellHook = ''
             export CACHE_DEFAULT_TIMEOUT=3600
             export CACHE_TYPE=filesystem
             export CACHE_DIR=$PWD/cache
             export LANG=en_US.UTF-8
             export DEBUG=1
  +          export APP_TESTING=${name}
             export FLASK_APP=${dirname}:app
           '' + shellHook;
   
  
positive.code:     , buildInputs ? []
      , propagatedBuildInputs ? []
      , doCheck ? true
      , postInstall ? ""
      , shellHook ? ""
      , dockerConfig ? {}
  
negative.code: 
        extractEggName =
          map
            (line:
              let
                split = splitString "egg=" line;
              in
  