anchor.diff:      sha256 = "04jx6ihj3zpj4c7acqa14gl37mpdnbgmfm4nvv97xkjc1cz920xm";
     };
   
  -  checkInputs = [ pytest nose ];
     propagatedBuildInputs = [ ipython jupyter_client traitlets tornado ];
   
     # https://github.com/ipython/ipykernel/pull/377
  
positive.code:     })
    ];
  
    # For failing tests, see https://github.com/ipython/ipykernel/issues/387
    checkPhase = ''
      HOME=$(mktemp -d) pytest ipykernel -k "not (test_sys_path or test_sys_path_profile_dir or test_complete)"
    '';
  
    # Some of the tests use localhost networking.
  
negative.code: , traitlets
  , tornado
  , pythonOlder
  , pytestCheckHook
  , nose
  }:
  
  