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, 9 insertions, 7 deletions

diff --git a/spec/ruby/library/socket/basicsocket/setsockopt_spec.rb b/spec/ruby/library/socket/basicsocket/setsockopt_spec.rb
index cafcfc202a..1471b03798 100644
--- a/spec/ruby/library/socket/basicsocket/setsockopt_spec.rb
+++ b/spec/ruby/library/socket/basicsocket/setsockopt_spec.rb
@@ -237,13 +237,15 @@ describe 'BasicSocket#setsockopt' do
         @socket.getsockopt(:IP, :TTL).int.should == 255
       end
 
-      it 'sets an IPv6 boolean option' do
-        socket = Socket.new(:INET6, :STREAM)
-        begin
-          socket.setsockopt(:IPV6, :V6ONLY, true).should == 0
-          socket.getsockopt(:IPV6, :V6ONLY).bool.should == true
-        ensure
-          socket.close
+      guard -> { SocketSpecs.ipv6_available? } do
+        it 'sets an IPv6 boolean option' do
+          socket = Socket.new(:INET6, :STREAM)
+          begin
+            socket.setsockopt(:IPV6, :V6ONLY, true).should == 0
+            socket.getsockopt(:IPV6, :V6ONLY).bool.should == true
+          ensure
+            socket.close
+          end
         end
       end