def test_get_latest_returns_latest_data_element_for_topic(self):
C = DictConnection()
topic_id = C.add_topic("topic",
description="description",
fields=["number"])
C.add_data(topic_id, {"number": 3})
C.add_data(topic_id, {"number": 2})
C.add_data(topic_id, {"number": 1})
latest = C.get_latest(topic_id)
self.assertEqual(latest["number"], 1)
def test_get_latest_handles_empty_list(self):
C = DictConnection()
topic_id = C.add_topic("topic")
with self.assertRaises(IndexError):
C.get_latest(topic_id)