AssertionError: No api proxy found for service "urlfetch"

See http://mcjeff.blogspot.com/2010/01/unit-tests-with-app-engine.html

from google.appengine.api import apiproxy_stub_map
from google.appengine.api import urlfetch_stub

# Create a stub map so we can build App Engine mock stubs.
apiproxy_stub_map.apiproxy = apiproxy_stub_map.APIProxyStubMap()

# Register App Engine mock stubs.
apiproxy_stub_map.apiproxy.RegisterStub(
    'urlfetch', urlfetch_stub.URLFetchServiceStub())

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