def test__uncached_lookupAll_empty_ro(self):
from zope.interface.interface import InterfaceClass
IFoo = InterfaceClass('IFoo')
IBar = InterfaceClass('IBar', IFoo)
registry = self._makeRegistry()
alb = self._makeOne(registry)
result = alb._uncached_lookupAll((IFoo,), IBar)
self.assertEqual(result, ())
self.assertEqual(len(alb._required), 1)
self.failUnless(IFoo.weakref() in alb._required)
