'L{IMAP4Client.expunge} sends the I{EXPUNGE} command and returns a
L{Deferred} which fires with a C{list} of message sequence numbers
given by the server\'s response.'

def test_expunge(self):

    d = self._expunge()
    self._response([3, 3, 5, 8])
    self.assertEqual(self._extractDeferredResult(d), [3, 3, 5, 8])
