=================================== FAILURES ===================================
18:06:56 _____________________ TestHttpStatus.test_server_not_found _____________________
18:06:56 
18:06:56 self = <tests.http_tests.TestHttpStatus testMethod=test_server_not_found>
18:06:56 
18:06:56     def test_server_not_found(self):
18:06:56         """Test server not found exception."""
18:06:56         with self.assertRaisesRegex(
18:06:56                 ConnectionError,
18:06:56                 'Max retries exceeded with url: /w/api.php'):
18:06:56 >           http.fetch('http://ru-sib.wikipedia.org/w/api.php',
18:06:56                        default_error_handling=True)
18:06:56 
18:06:56 tests/http_tests.py:149: 
18:06:56 _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
18:06:56 pywikibot/comms/http.py:453: in fetch
18:06:56     callback(response)
18:06:56 pywikibot/comms/http.py:338: in error_handling_callback
18:06:56     raise response from None
18:06:56 pywikibot/comms/http.py:444: in fetch
18:06:56     response = session.request(method, uri,
18:06:56 .tox/deeptest-py39/lib/python3.9/site-packages/requests/sessions.py:587: in request
18:06:56     resp = self.send(prep, **send_kwargs)
18:06:56 .tox/deeptest-py39/lib/python3.9/site-packages/requests/sessions.py:701: in send
18:06:56     r = adapter.send(request, **kwargs)
18:06:56 _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
18:06:56 
18:06:56     def send(
18:06:56         self, request, stream=False, timeout=None, verify=True, cert=None, proxies=None
18:06:56     ):
18:06:56         """Sends PreparedRequest object. Returns Response object.
18:06:56     
18:06:56         :param request: The :class:`PreparedRequest <PreparedRequest>` being sent.
18:06:56         :param stream: (optional) Whether to stream the request content.
18:06:56         :param timeout: (optional) How long to wait for the server to send
18:06:56             data before giving up, as a float, or a :ref:`(connect timeout,
18:06:56             read timeout) <timeouts>` tuple.
18:06:56         :type timeout: float or tuple or urllib3 Timeout object
18:06:56         :param verify: (optional) Either a boolean, in which case it controls whether
18:06:56             we verify the server's TLS certificate, or a string, in which case it
18:06:56             must be a path to a CA bundle to use
18:06:56         :param cert: (optional) Any user-provided SSL certificate to be trusted.
18:06:56         :param proxies: (optional) The proxies dictionary to apply to the request.
18:06:56         :rtype: requests.Response
18:06:56         """
18:06:56     
18:06:56         try:
18:06:56             conn = self.get_connection(request.url, proxies)
18:06:56         except LocationValueError as e:
18:06:56             raise InvalidURL(e, request=request)
18:06:56     
18:06:56         self.cert_verify(conn, request.url, verify, cert)
18:06:56         url = self.request_url(request, proxies)
18:06:56         self.add_headers(
18:06:56             request,
18:06:56             stream=stream,
18:06:56             timeout=timeout,
18:06:56             verify=verify,
18:06:56             cert=cert,
18:06:56             proxies=proxies,
18:06:56         )
18:06:56     
18:06:56         chunked = not (request.body is None or "Content-Length" in request.headers)
18:06:56     
18:06:56         if isinstance(timeout, tuple):
18:06:56             try:
18:06:56                 connect, read = timeout
18:06:56                 timeout = TimeoutSauce(connect=connect, read=read)
18:06:56             except ValueError:
18:06:56                 raise ValueError(
18:06:56                     f"Invalid timeout {timeout}. Pass a (connect, read) timeout tuple, "
18:06:56                     f"or a single float to set both timeouts to the same value."
18:06:56                 )
18:06:56         elif isinstance(timeout, TimeoutSauce):
18:06:56             pass
18:06:56         else:
18:06:56             timeout = TimeoutSauce(connect=timeout, read=timeout)
18:06:56     
18:06:56         try:
18:06:56             resp = conn.urlopen(
18:06:56                 method=request.method,
18:06:56                 url=url,
18:06:56                 body=request.body,
18:06:56                 headers=request.headers,
18:06:56                 redirect=False,
18:06:56                 assert_same_host=False,
18:06:56                 preload_content=False,
18:06:56                 decode_content=False,
18:06:56                 retries=self.max_retries,
18:06:56                 timeout=timeout,
18:06:56                 chunked=chunked,
18:06:56             )
18:06:56     
18:06:56         except (ProtocolError, OSError) as err:
18:06:56             raise ConnectionError(err, request=request)
18:06:56     
18:06:56         except MaxRetryError as e:
18:06:56             if isinstance(e.reason, ConnectTimeoutError):
18:06:56                 # TODO: Remove this in 3.0.0: see #2811
18:06:56                 if not isinstance(e.reason, NewConnectionError):
18:06:56                     raise ConnectTimeout(e, request=request)
18:06:56     
18:06:56             if isinstance(e.reason, ResponseError):
18:06:56                 raise RetryError(e, request=request)
18:06:56     
18:06:56             if isinstance(e.reason, _ProxyError):
18:06:56                 raise ProxyError(e, request=request)
18:06:56     
18:06:56             if isinstance(e.reason, _SSLError):
18:06:56                 # This branch is for urllib3 v1.22 and later.
18:06:56                 raise SSLError(e, request=request)
18:06:56     
18:06:56 >           raise ConnectionError(e, request=request)
18:06:56 E           requests.exceptions.ConnectionError: HTTPConnectionPool(host='ru-sib.wikipedia.org', port=80): Max retries exceeded with url: /w/api.php (Caused by NameResolutionError("<urllib3.connection.HTTPConnection object at 0x7fcdf204e910>: Failed to resolve 'ru-sib.wikipedia.org' ([Errno -2] Name or service not known)"))
18:06:56 
18:06:56 .tox/deeptest-py39/lib/python3.9/site-packages/requests/adapters.py:519: ConnectionError