'Verify that a command that requires no answer is run.'

def test_requiresNoAnswer(self):

    (c, s, p) = connectedServerAndClient(ServerClass=SimpleSymmetricCommandProtocol, ClientClass=SimpleSymmetricCommandProtocol)
    HELLO = 'world'
    c.callRemote(NoAnswerHello, hello=HELLO)
    p.flush()
    self.assertTrue(s.greeted)
