second testcase for https://github.com/arskom/spyne/issues/272

gistfile1.py

from spyne.application import Application
from spyne.decorator import rpc
from spyne.model import Unicode
from spyne.protocol.soap.soap11 import Soap11
from spyne.service import ServiceBase

class Customer(Unicode):
    class Attributes(Unicode.Attributes):
        min_len=1


class DummyService(ServiceBase):
    @rpc(Customer, _returns=Unicode)
    def loadServices(ctx, serviceParams):
        return '42'


spyne_application = Application([DummyService],
    tns='dummy',
    name='DummyService', 
    in_protocol=Soap11(validator='lxml'),
    out_protocol=Soap11()
)