def test_uniqueness(self):
""" Seeds should be different from one another. """
seeds = [
rank.seed_for(models.Participant(pk=33), '22'),
rank.seed_for(models.Participant(pk=22), '33'),
rank.seed_for(models.Participant(pk=22), '22'),
]
self.assertEqual(len(seeds), len(set(seeds)))
def test_uniqueness(self):
""" Seeds should be different from one another. """
seeds = [
rank.seed_for(models.Participant(pk=33), '22'),
rank.seed_for(models.Participant(pk=22), '33'),
rank.seed_for(models.Participant(pk=22), '22'),
]
self.assertEqual(len(seeds), len(set(seeds)))
def test_weight_subtraction(self):
""" Test the definition of affiliation-weighted randomness.
Specifically, we take a random float from a particular seed, and
subtract a known offset according to the participant's affiliation.
"""
# MIT undergraduates get an advantage: their number is more likely to be lower
mit_undergrad = models.Participant(pk=12, affiliation='MU')
seed = rank.seed_for(mit_undergrad, 'trip-142')
random.seed(seed)
self.assertEqual(
random.random() - 0.3,
rank.affiliation_weighted_rand(mit_undergrad, 'trip-142'))
# Non-affiliates are just a random number
non_affiliate = models.Participant(pk=24, affiliation='NA')
seed = rank.seed_for(non_affiliate, 'trip-142')
random.seed(seed)
self.assertEqual(
random.random(),
rank.affiliation_weighted_rand(non_affiliate, 'trip-142'))
def test_weight_subtraction(self):
""" Test the definition of affiliation-weighted randomness.
Specifically, we take a random float from a particular seed, and
subtract a known offset according to the participant's affiliation.
"""
# MIT undergraduates get an advantage: their number is more likely to be lower
mit_undergrad = models.Participant(pk=12, affiliation='MU')
seed = rank.seed_for(mit_undergrad, 'trip-142')
random.seed(seed)
self.assertEqual(
random.random() - 0.3,
rank.affiliation_weighted_rand(mit_undergrad, 'trip-142'),
)
# Non-affiliates are just a random number
non_affiliate = models.Participant(pk=24, affiliation='NA')
seed = rank.seed_for(non_affiliate, 'trip-142')
random.seed(seed)
self.assertEqual(
random.random(), rank.affiliation_weighted_rand(non_affiliate, 'trip-142')
)
def test_seed_contains_secret(self):
""" The seed should contain the secret that participant's don't know. """
seed = rank.seed_for(models.Participant(pk=33), 'some extra seed')
self.assertIn(settings.PRNG_SEED_SECRET, seed)
def test_participant_must_be_saved_to_db(self):
""" We can't come up with a fair seed for a participant that lacks a pk. """
with self.assertRaises(ValueError):
rank.seed_for(models.Participant(name='Not Saved'),
lottery_key='hi')
def test_participant_must_be_saved_to_db(self):
""" We can't come up with a fair seed for a participant that lacks a pk. """
with self.assertRaises(ValueError):
rank.seed_for(models.Participant(name='Not Saved'), lottery_key='hi')
def test_seed_contains_secret(self):
""" The seed should contain the secret that participant's don't know. """
seed = rank.seed_for(models.Participant(pk=33), 'some extra seed')
self.assertIn(settings.PRNG_SEED_SECRET, seed)