streambase.py test fails sometimes

[Jajcus]

The 'test_connect_close' test from tests/streambase.py fails sometimes, especially when started via 'all.py':

$ ./all.py
...............................................................F.....F.....F........................
======================================================================
FAIL: test_connect_close (streambase.TestInitiatorSelect)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/users/jajcus/git/pyxmpp2/tests/streambase.py", line 70, in test_connect_close
    ConnectedEvent, DisconnectedEvent])
AssertionError: Lists differ: [<class 'pyxmpp2.streamevents.... != [<class 'pyxmpp2.streamevents....

First differing element 1:
<class 'pyxmpp2.streamevents.DisconnectedEvent'>
<class 'pyxmpp2.streamevents.ConnectedEvent'>

Second list contains 1 additional elements.
First extra element 2:
<class 'pyxmpp2.streamevents.DisconnectedEvent'>

  [<class 'pyxmpp2.streamevents.ConnectingEvent'>,
+  <class 'pyxmpp2.streamevents.ConnectedEvent'>,
   <class 'pyxmpp2.streamevents.DisconnectedEvent'>]

======================================================================
FAIL: test_connect_close (streambase.TestInitiatorPoll)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/users/jajcus/git/pyxmpp2/tests/streambase.py", line 70, in test_connect_close
    ConnectedEvent, DisconnectedEvent])
AssertionError: Lists differ: [<class 'pyxmpp2.streamevents.... != [<class 'pyxmpp2.streamevents....

First differing element 1:
<class 'pyxmpp2.streamevents.DisconnectedEvent'>
<class 'pyxmpp2.streamevents.ConnectedEvent'>

Second list contains 1 additional elements.
First extra element 2:
<class 'pyxmpp2.streamevents.DisconnectedEvent'>

  [<class 'pyxmpp2.streamevents.ConnectingEvent'>,
+  <class 'pyxmpp2.streamevents.ConnectedEvent'>,
   <class 'pyxmpp2.streamevents.DisconnectedEvent'>]

======================================================================
FAIL: test_connect_close (streambase.TestInitiatorThreaded)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/users/jajcus/git/pyxmpp2/tests/streambase.py", line 70, in test_connect_close
    ConnectedEvent, DisconnectedEvent])
AssertionError: Lists differ: [<class 'pyxmpp2.streamevents.... != [<class 'pyxmpp2.streamevents....

First differing element 1:
<class 'pyxmpp2.streamevents.DisconnectedEvent'>
<class 'pyxmpp2.streamevents.ConnectedEvent'>

Second list contains 1 additional elements.
First extra element 2:
<class 'pyxmpp2.streamevents.DisconnectedEvent'>

  [<class 'pyxmpp2.streamevents.ConnectingEvent'>,
+  <class 'pyxmpp2.streamevents.ConnectedEvent'>,
   <class 'pyxmpp2.streamevents.DisconnectedEvent'>]

----------------------------------------------------------------------
Ran 100 tests in 35.134s

FAILED (failures=3)