'A sentence attribute gets the correct value, and accessing an
unset attribute (which is specified as being a valid sentence
attribute) gets L{None}.'

def test_attributeAccess(self):

    thisSentinel = object()
    sentence = self.sentenceClass({sentinelValueOne: thisSentinel})
    self.assertEqual(getattr(sentence, sentinelValueOne), thisSentinel)
    self.assertIsNone(getattr(sentence, sentinelValueTwo))
