'Test the single form of the STAT command, which returns a short-form
response of the number of messages in the mailbox and their total size.'

def testSTAT(self):

    p = self.pop3Server
    s = self.pop3Transport
    p.lineReceived('STAT')
    self._flush()
    self.assertEqual(s.getvalue(), '+OK    1    44\r\n')
