tests: support Linux kernels with CONFIG_IPV6=n

Detecting the presence of constants in C headers is insufficient,
as a Linux kernel can be built with CONFIG_IPV6=n

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@65055 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 7 insertions, 3 deletions

diff --git a/test/socket/test_udp.rb b/test/socket/test_udp.rb
index bec2181918..f060b65f2c 100644
--- a/test/socket/test_udp.rb
+++ b/test/socket/test_udp.rb
@@ -20,9 +20,13 @@ class TestSocket_UDPSocket < Test::Unit::TestCase
       assert_match(/AF_INET\b/, sock.inspect)
     }
     if Socket.const_defined?(:AF_INET6)
-      UDPSocket.open(Socket::AF_INET6) {|sock|
-        assert_match(/AF_INET6\b/, sock.inspect)
-      }
+      begin
+        UDPSocket.open(Socket::AF_INET6) {|sock|
+          assert_match(/AF_INET6\b/, sock.inspect)
+        }
+      rescue Errno::EAFNOSUPPORT
+        skip 'AF_INET6 not supported by kernel'
+      end
     end
   end