Travis doesn't support IPv6 on osx and linux with sudo

radicale/tests/test_server.py

@@ -26,7 +26,6 @@ import ssl
 import tempfile
 import threading
 import time
-import warnings
 from urllib import request
 from urllib.error import HTTPError, URLError
 
@@ -109,10 +108,11 @@ class TestBaseServerRequests:
         assert status == 302
 
     def test_ipv6(self):
-        if not server.HAS_IPV6:
+        if (not server.HAS_IPV6 or os.environ.get("TRAVIS_OS_NAME") == "osx" or
+                os.environ.get("TRAVIS_SUDO") == "true"):
             pytest.skip("IPv6 not support")
-        if os.name == "nt" and os.environ.get("WINE_PYTHON"):
-            warnings.warn("WORKAROUND: incomplete errno conversion in WINE")
+        if os.name == "nt" and server.EAI_ADDRFAMILY is None:
+            # HACK: incomplete errno conversion in WINE
             server.EAI_ADDRFAMILY = -9
         with socket.socket(socket.AF_INET6, socket.SOCK_STREAM) as sock:
             sock.setsockopt(server.IPPROTO_IPV6, server.IPV6_V6ONLY, 1)