def test_can_get_sum_of_metric(self):
track = analytics.Manager(None, 'x', 'y', 'z')
track.add_observation('b', 1)
track.add_observation('b', 2)
_, result = track.summarize_and_reset('b')
self.assertEqual(3, result)
def test_summarize_resets_metric(self):
track = analytics.Manager(None, 'x', 'y', 'z')
track.add_observation('metric', 1)
track.add_observation('metric', 2)
track.summarize_and_reset('metric')
_, result = track.summarize_and_reset('metric')
self.assertIsNone(result)
def test_empty_summarize_is_none(self):
track = analytics.Manager(None, 'x', 'y', 'z')
_, result = track.summarize_and_reset('a')
self.assertIsNone(result)