'Removing a reader stops the C{LoopingCall}.'

def test_removeReader(self):

    poller = _ContinuousPolling(Clock())
    reader = object()
    poller.addReader(reader)
    poller.removeReader(reader)
    self.assertIsNone(poller._loop)
    self.assertEqual(poller._reactor.getDelayedCalls(), [])
    self.assertFalse(poller.isReading(reader))
