timeout when asynchronous tests are broken. it's all mocked so 2 seco…

…nds are very long already.

pyduofern/tests/test_replay.py

@@ -28,6 +28,7 @@
 import os
 import re
 import tempfile
+import time
 
 import pytest
 
@@ -154,10 +155,13 @@ def test_init_against_mocked_stick(event_loop, replayfile):
 
     # if proto.transport.next_is_sent():
     #    proto.transport.write(bytearray.fromhex(proto.transport.replay[-1][1].strip()))
+    start_time = time.time()
     @asyncio.coroutine
     def feedback_loop():
         while proto.transport.replay:
             yield
+            if time.time() - start_time > 3:
+                raise TimeoutError("Mock test should not take longer than 30 seconds, asynchronous loop must be stuck")
 
             if proto.transport.next_is_action():
                 asyncio.ensure_future(proto.transport.actions())