'A subclass of L{XMLRPC} can override C{lookupProcedure} to raise
L{NoSuchFunction} to indicate that a requested method is not available
to be called, signalling a fault to the XML-RPC client.'

def test_errors(self):

    self.createServer(TestLookupProcedure())
    d = self.proxy.callRemote('xxxx', 'hello')
    d = self.assertFailure(d, xmlrpc.Fault)
    return d
