Add some logging to diagnose this flaky test on travis.

diff --git a/tornado/test/tcpclient_test.py b/tornado/test/tcpclient_test.py
index a12f5aafd7179afa52e735fa4af8535bdc91c555..dc738e7e7ad135b7ef2a43c10232180a739720b8 100644 (file)
--- a/tornado/test/tcpclient_test.py
+++ b/tornado/test/tcpclient_test.py
@@ -34,7 +34,11 @@ class TestTCPServer(TCPServer):
     def __init__(self, family):
         super(TestTCPServer, self).__init__()
         self.streams = []
-        sockets = bind_sockets(None, 'localhost', family)
+        try:
+            sockets = bind_sockets(None, 'localhost', family)
+        except:
+            print(socket.getaddrinfo('localhost', 0))
+            raise
         self.add_sockets(sockets)
         self.port = sockets[0].getsockname()[1]