data value checking in TestPubSubSockets::test_conflate (#644)

* check each message value in test_messaging

* check correctness with conflate False

msgq/tests/test_messaging.py

@@ -52,9 +52,11 @@ class TestPubSubSockets:
         recvd_msgs = msgq.drain_sock_raw(sub_sock)
         if conflate:
           assert len(recvd_msgs) == 1
+          assert recvd_msgs[0] == sent_msgs[-1]
         else:
-          # TODO: compare actual data
           assert len(recvd_msgs) == len(sent_msgs)
+          for rec_msg, sent_msg in zip(recvd_msgs, sent_msgs):
+            assert rec_msg == sent_msg
 
   def test_receive_timeout(self):
     sock = random_sock()