'A L{crefutil._Container} where all of its elements are known at
construction time is nonsensical and will result in errors in any call
to addDependant.'

def test_containerWhereAllElementsAreKnown(self):

    container = crefutil._Container([1, 2, 3], list)
    self.assertRaises(AssertionError, container.addDependant, {}, 'ignore-me')
