'Assert that L{SSHAgentClient.signData} raises a ConchError
if we get a response from the server whose opcode doesn\'t match
the protocol for data signing requests.'

def test_signDataCallbackErrorHandling(self):

    d = self.client.signData(self.rsaPublic.blob(), 'John    Hancock')
    self.pump.flush()
    return self.assertFailure(d, ConchError)
