anchor.diff: -{ lib, python3, fetchFromGitHub, ncurses }:
  +{ lib
  +, python3
  +, fetchFromGitHub
  +, ncurses
  +}:
   
   python3.pkgs.buildPythonApplication rec {
     pname = "swaglyrics";
     version = "unstable-2021-06-17";
  +  format = "setuptools";
   
     src = fetchFromGitHub {
       owner = "SwagLyrics";
       repo = "SwagLyrics-For-Spotify";
       rev = "99fe764a9e45cac6cb9fcdf724c7d2f8cb4524fb";
  -    sha256 = "sha256-O48T1WsUIVnNQb8gmzSkFFHTOiFOKVSAEYhF9zUqZz0=";
  +    hash = "sha256-O48T1WsUIVnNQb8gmzSkFFHTOiFOKVSAEYhF9zUqZz0=";
     };
   
     propagatedBuildInputs = with python3.pkgs; [
  -    unidecode colorama beautifulsoup4 flask requests swspotify
  +    beautifulsoup4
  +    colorama
  +    flask
  +    requests
  +    swspotify
  +    unidecode
  +  ];
  +
  +  checkInputs = with python3.pkgs; [
  +    blinker
  +    flask
  +    flask-testing
  +    mock
  +    pytestCheckHook
  +  ] ++ [
  +    ncurses
     ];
   
     preConfigure = ''
  
positive.code:       --replace 'flask==2.0.1' 'flask>=2.0.1'
    '';
  
    preBuild = "export HOME=$NIX_BUILD_TOP";
  
    # disable tests which touch network
    disabledTests = [
       "test_database_for_unsupported_song"
       "test_that_lyrics_works_for_unsupported_songs"
       "test_that_get_lyrics_works"
  
negative.code:      "test_songchanged_can_raise_songplaying"
    ];
  
    pythonImportsCheck = [
      "swaglyrics"
    ];
  
    meta = with lib; {
      description = "Lyrics fetcher for currently playing Spotify song";
  