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kqueue doesn't support character devices like PTY before Mac OS 10.9. This issue is discussion on Tulip mailing list, no decision was taken yet how to fix this issue.
http://buildbot.python.org/all/builders/AMD64%20Snow%20Leop%203.x/builds/1071/steps/test/logs/stdio
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ERROR: test_read_pty_output (test.test_asyncio.test_events.KqueueEventLoopTests)
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Traceback (most recent call last):
 File "/Users/buildbot/buildarea/3.x.murray-snowleopard/build/Lib/asyncio/selector_events.py", line 135, in add_reader
 key = self._selector.get_key(fd)
 File "/Users/buildbot/buildarea/3.x.murray-snowleopard/build/Lib/selectors.py", line 181, in get_key
 raise KeyError("{!r} is not registered".format(fileobj)) from None
KeyError: '7 is not registered'
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
 File "/Users/buildbot/buildarea/3.x.murray-snowleopard/build/Lib/test/test_asyncio/test_events.py", line 980, in test_read_pty_output
 self.loop.run_until_complete(connect())
 File "/Users/buildbot/buildarea/3.x.murray-snowleopard/build/Lib/asyncio/base_events.py", line 177, in run_until_complete
 return future.result()
 File "/Users/buildbot/buildarea/3.x.murray-snowleopard/build/Lib/asyncio/futures.py", line 236, in result
 raise self._exception
 File "/Users/buildbot/buildarea/3.x.murray-snowleopard/build/Lib/asyncio/tasks.py", line 281, in _step
 result = next(coro)
 File "/Users/buildbot/buildarea/3.x.murray-snowleopard/build/Lib/test/test_asyncio/test_events.py", line 974, in connect
 master_read_obj)
 File "/Users/buildbot/buildarea/3.x.murray-snowleopard/build/Lib/asyncio/base_events.py", line 537, in connect_read_pipe
 transport = self._make_read_pipe_transport(pipe, protocol, waiter)
 File "/Users/buildbot/buildarea/3.x.murray-snowleopard/build/Lib/asyncio/unix_events.py", line 149, in _make_read_pipe_transport
 return _UnixReadPipeTransport(self, pipe, protocol, waiter, extra)
 File "/Users/buildbot/buildarea/3.x.murray-snowleopard/build/Lib/asyncio/unix_events.py", line 200, in __init__
 self._loop.add_reader(self._fileno, self._read_ready)
 File "/Users/buildbot/buildarea/3.x.murray-snowleopard/build/Lib/asyncio/selector_events.py", line 138, in add_reader
 (handle, None))
 File "/Users/buildbot/buildarea/3.x.murray-snowleopard/build/Lib/selectors.py", line 462, in register
 self._kqueue.control([kev], 0, 0)
OSError: [Errno 22] Invalid argument