def METHOD_NAME(self):
    """
    If a C{doRead} returns a value indicating disconnection,
    C{connectionLost} is called on it.
    """
    reactor = Clock()
    poller = _ContinuousPolling(reactor)
    desc = Descriptor()
    desc.doRead = lambda: ConnectionDone()
    poller.addReader(desc)
    self.assertEqual(desc.events, [])
    reactor.advance(0.001)
    self.assertEqual(desc.events, ["lost"])