def test_story_is_published_validation(self):
     self.topic.canonical_story_references = [
         topic_domain.StoryReference('story_id', 'published')
     ]
     self._assert_validation_error(
         'Expected story_is_published to be a boolean')
 def test_story_id_validation(self):
     self.topic.canonical_story_references = [
         topic_domain.StoryReference(123, True)
     ]
     self._assert_validation_error('Expected story id to be a string')