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I'm not sure what would be the best way to verify that. 
What about:
 def test_connect_with_msg_callback(self):
 with support.transient_internet("svn.python.org"):
 self.called = False
 def cb(packet):
 self.assertGreater(len(packet), 0)
 self.called = True
 ctx = ssl.SSLContext(ssl.PROTOCOL_SSLv23)
 ctx.set_msg_callback(cb)
 s = ctx.wrap_socket(socket.socket(socket.AF_INET))
 try:
 s.connect(("svn.python.org", 443))
 self.assertTrue(self.called)
 finally:
 s.close()