'Test an erroneous add: if a L{MemCacheProtocol.add} is called but the
key already exists on the server, it returns a B{NOT STORED} answer,
which calls back the resulting L{Deferred} with C{False}.'

def test_errorAdd(self):

    return self._test(self.proto.add('foo', 'bar'), 'add    foo    0    0    3\r\nbar\r\n', 'NOT    STORED\r\n', False)
