anchor.diff:      owner = "dropbox";
       repo = "dropbox-sdk-python";
       rev = "v${version}";
  -    sha256 = "sha256-pq/LkyOCS0PnujfN9aIx42aeZ8tw4XvRQ4Vid/nXgWE=";
  +    hash = "sha256-pq/LkyOCS0PnujfN9aIx42aeZ8tw4XvRQ4Vid/nXgWE=";
     };
   
     propagatedBuildInputs = [
       requests
  -    urllib3
  +    six
  +    stone
  +  ];
  +
  +  checkInputs = [
       mock
  -    setuptools
  -    stone
  +    pytest-mock
  +    pytestCheckHook
     ];
   
     postPatch = ''
  
positive.code:       --replace "'pytest-runner == 5.2.0'," ""
    '';
  
    # Set DROPBOX_TOKEN environment variable to a valid token.
    doCheck = false;
  
    pythonImportsCheck = [
      "dropbox"
    ];
  
    meta = with lib; {
  
negative.code: { lib
  , buildPythonPackage
  , pythonOlder
  , fetchFromGitHub
  , requests
  , six
  , stone
  , mock
  , pytest-mock
  , pytestCheckHook
  }:
  
  buildPythonPackage rec {
  