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| -rw-r--r-- | Lib/test/test_random.py | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/Lib/test/test_random.py b/Lib/test/test_random.py index 840f3e7..4d5a874 100644 --- a/Lib/test/test_random.py +++ b/Lib/test/test_random.py @@ -205,6 +205,20 @@ class TestBasicOps: ]: self.assertTrue(set(choices(data, cum_weights=weights, k=5)) <= set(data)) + # Test weight focused on a single element of the population + self.assertEqual(choices('abcd', [1, 0, 0, 0]), ['a']) + self.assertEqual(choices('abcd', [0, 1, 0, 0]), ['b']) + self.assertEqual(choices('abcd', [0, 0, 1, 0]), ['c']) + self.assertEqual(choices('abcd', [0, 0, 0, 1]), ['d']) + + # Test consistency with random.choice() for empty population + with self.assertRaises(IndexError): + choices([], k=1) + with self.assertRaises(IndexError): + choices([], weights=[], k=1) + with self.assertRaises(IndexError): + choices([], cum_weights=[], k=5) + def test_gauss(self): # Ensure that the seed() method initializes all the hidden state. In # particular, through 2.2.1 it failed to reset a piece of state used |