def test_purge_subscribers(self):
c = Channel(1)
messages = []
onTimeout = lambda: self._onTimeout(messages)
self.assertEqual(0, len(c.subscribers))
c.subscribe(None, onTimeout, timeoutSec = 1)
self.assertEqual(1, len(c.subscribers))
c.purgeSubscribers()
self.assertEqual(1, len(c.subscribers))
self.assertEqual(0, len(messages))
time.sleep(1)
print c.subscribers
c.purgeSubscribers()
self.assertEqual(0, len(c.subscribers))
self.assertEqual("timeout", messages[0])
