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Add test for hash commutativity.

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This commit is contained in:
Raymond Hettinger 2005-07-05 05:34:43 +00:00
parent 2dfc168bc3
commit 82cb9a235d
1 changed files with 10 additions and 0 deletions
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10
Lib/test/test_set.py
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@ -5,6 +5,7 @@ import operator
import copy import copy
import pickle import pickle
import os import os
from random import randrange, shuffle
class PassThru(Exception): class PassThru(Exception):
pass pass
@ -399,6 +400,15 @@ class TestFrozenSet(TestJointOps):
self.assertEqual(hash(self.thetype('abcdeb')), self.assertEqual(hash(self.thetype('abcdeb')),
hash(self.thetype('ebecda'))) hash(self.thetype('ebecda')))
# make sure that all permutations give the same hash value
n = 100
seq = [randrange(n) for i in xrange(n)]
results = set()
for i in xrange(200):
shuffle(seq)
results.add(hash(self.thetype(seq)))
self.assertEqual(len(results), 1)
def test_copy(self): def test_copy(self):
dup = self.s.copy() dup = self.s.copy()
self.assertEqual(id(self.s), id(dup)) self.assertEqual(id(self.s), id(dup))