test_nonblock.rb: refine failure message

* test/socket/test_nonblock.rb (test_accept_nonblock): refine
  assertion for better failure message.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@50530 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 1 insertions, 1 deletions

diff --git a/test/socket/test_nonblock.rb b/test/socket/test_nonblock.rb
index 526825269e..0109d19636 100644
--- a/test/socket/test_nonblock.rb
+++ b/test/socket/test_nonblock.rb
@@ -26,7 +26,7 @@ class TestSocketNonblock < Test::Unit::TestCase
     end
     assert_equal(Socket.unpack_sockaddr_in(c.getsockname), Socket.unpack_sockaddr_in(sockaddr))
     if s.respond_to?(:nonblock?)
-      assert s.nonblock?, 'accepted socket is non-blocking'
+      assert_predicate(s, :nonblock?, 'accepted socket is non-blocking')
     end
   ensure
     serv.close if serv