TestDownloaderBase.setUpClass()
        cls.downloader = downloader.find("http")(cls.job)

        port = 8088
        cls.address = "http://127.0.0.1:{}".format(port)
        cls._jpg = cls.address + "/image.jpg"
        cls._png = cls.address + "/image.png"
        cls._gif = cls.address + "/image.gif"

>       server = http.server.HTTPServer(("", port), HttpRequestHandler)

test/test_downloader.py:179:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
/nix/store/65gmh01007csxmd6bbkvas8zkhlw0k7n-python3-3.8.6/lib/python3.8/socketserver.py:452: in __init__
    self.server_bind()
/nix/store/65gmh01007csxmd6bbkvas8zkhlw0k7n-python3-3.8.6/lib/python3.8/http/server.py:138: in server_bind
    socketserver.TCPServer.server_bind(self)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

self = <http.server.HTTPServer object at 0x10d31e8b0>

    def server_bind(self):
        """Called by constructor to bind the socket.

        May be overridden.

        """
        if self.allow_reuse_address:
            self.socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
>       self.socket.bind(self.server_address)
E       PermissionError: [Errno 1] Operation not permitted

/nix/store/65gmh01007csxmd6bbkvas8zkhlw0k7n-python3-3.8.6/lib/python3.8/socketserver.py:466: PermissionError
=========================== short test summary info ============================
ERROR test/test_downloader.py::TestHTTPDownloader::test_http_adjust_extension
ERROR test/test_downloader.py::TestHTTPDownloader::test_http_download - Permi...
ERROR test/test_downloader.py::TestHTTPDownloader::test_http_extension - Perm...
ERROR test/test_downloader.py::TestHTTPDownloader::test_http_filesize_max - P...
ERROR test/test_downloader.py::TestHTTPDownloader::test_http_filesize_min - P...
ERROR test/test_downloader.py::TestHTTPDownloader::test_http_offset - Permiss...
=================== 130 passed, 3 skipped, 6 errors in 3.21s ===================