def setUp(self):
# Generate random results, calculate intermediate values for those
# results.
self.random_results = [random.choice(THINGS) for _ in range(50)]
self.past_counts = oracle.count_past_events(
self.random_results, LARGE_WINDOW)
self.weights = oracle.calculate_weights(
THINGS, self.past_counts, LARGE_WINDOW)
self.cdf = oracle.calculate_cdf(self.weights)
self.random_thing = oracle.sample_cdf(self.cdf)
def test_calculate_cdf(self):
# Simple case.
weights = {'a': 0.25, 'b': 0.25, 'c': 0.25, 'd': 0.25}
self.assertEqual({0.25: 'a', 0.5: 'b', 0.75: 'c',
1.0: 'd'}, oracle.calculate_cdf(weights))
# All keys of cdf should be values in [0,1] range.
self.assertNotIn(False, [1 >= t >= 0 for t in self.cdf])
# All values of cdf should be THINGS.
self.assertNotIn(
False, [
thing in THINGS for thing in self.cdf.values()])
