akr	2014-01-21 00:51:33 +0900 (Tue, 21 Jan 2014)

  New Revision: 44666

  http://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=rev&revision=44666

  Log:
    add a test.

  Modified files:
    trunk/test/socket/test_sockopt.rb
Index: test/socket/test_sockopt.rb
===================================================================
--- test/socket/test_sockopt.rb	(revision 44665)
+++ test/socket/test_sockopt.rb	(revision 44666)
@@ -43,6 +43,13 @@ class TestSocketOption < Test::Unit::Tes https://github.com/ruby/ruby/blob/trunk/test/socket/test_sockopt.rb#L43
     assert_equal(128, sockopt.ipv4_multicast_ttl)
   end
 
+  def test_ipv4_multicast_ttl_size
+    expected_size = Socket.open(:INET, :DGRAM) {|s|
+      s.getsockopt(:IP, :MULTICAST_TTL).to_s.bytesize
+    }
+    assert_equal(expected_size, Socket::Option.ipv4_multicast_ttl(0).to_s.bytesize)
+  end
+
   def test_unpack
     sockopt = Socket::Option.new(:INET, :SOCKET, :KEEPALIVE, [1].pack("i"))
     assert_equal([1], sockopt.unpack("i"))

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