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//usr/lib/python2.4/test/test_hash.py
# test the invariant that # iff a==b then hash(a)==hash(b) # import os import sys import struct import datetime import unittest import subprocess from test import test_support IS_64BIT = (struct.calcsize('l') == 8) class HashEqualityTestCase(unittest.TestCase): def same_hash(self, *objlist): # Hash each object given and fail if # the hash values are not all the same. hashed = map(hash, objlist) for h in hashed[1:]: if h != hashed[0]: self.fail("hashed values differ: %r" % (objlist,)) def test_numeric_literals(self): self.same_hash(1, 1L, 1.0, 1.0+0.0j) def test_coerced_integers(self): self.same_hash(int(1), long(1), float(1), complex(1), int('1'), float('1.0')) def test_coerced_floats(self): self.same_hash(long(1.23e300), float(1.23e300)) self.same_hash(float(0.5), complex(0.5, 0.0)) class HashRandomizationTests(unittest.TestCase): # Each subclass should define a field "repr_", containing the repr() of # an object to be tested def get_hash_command(self, repr_): return 'print(hash(%s))' % repr_ def get_hash(self, repr_, seed=None): env = os.environ.copy() if seed is not None: env['PYTHONHASHSEED'] = str(seed) else: env.pop('PYTHONHASHSEED', None) cmd_line = [sys.executable, '-c', self.get_hash_command(repr_)] p = subprocess.Popen(cmd_line, stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.STDOUT, env=env) out, err = p.communicate() out = test_support.strip_python_stderr(out) return int(out.strip()) def test_randomized_hash(self): # two runs should return different hashes run1 = self.get_hash(self.repr_, seed='random') run2 = self.get_hash(self.repr_, seed='random') self.assertNotEqual(run1, run2) class StringlikeHashRandomizationTests(HashRandomizationTests): def test_null_hash(self): # PYTHONHASHSEED=0 disables the randomized hash if IS_64BIT: known_hash_of_obj = 1453079729188098211 else: known_hash_of_obj = -1600925533 # Randomization is disabled by default: self.assertEqual(self.get_hash(self.repr_), known_hash_of_obj) # It can also be disabled by setting the seed to 0: self.assertEqual(self.get_hash(self.repr_, seed=0), known_hash_of_obj) def test_fixed_hash(self): # test a fixed seed for the randomized hash # Note that all types share the same values: if IS_64BIT: if sys.byteorder == 'little': h = -4410911502303878509 else: h = -3570150969479994130 else: if sys.byteorder == 'little': h = -206076799 else: h = -1024014457 self.assertEqual(self.get_hash(self.repr_, seed=42), h) class StrHashRandomizationTests(StringlikeHashRandomizationTests): repr_ = repr('abc') def test_empty_string(self): self.assertEqual(hash(""), 0) class UnicodeHashRandomizationTests(StringlikeHashRandomizationTests): repr_ = repr(u'abc') def test_empty_string(self): self.assertEqual(hash(u""), 0) class BufferHashRandomizationTests(StringlikeHashRandomizationTests): repr_ = 'buffer("abc")' def test_empty_string(self): self.assertEqual(hash(buffer("")), 0) class DatetimeTests(HashRandomizationTests): def get_hash_command(self, repr_): return 'import datetime; print(hash(%s))' % repr_ class DatetimeDateTests(DatetimeTests): repr_ = repr(datetime.date(1066, 10, 14)) class DatetimeDatetimeTests(DatetimeTests): repr_ = repr(datetime.datetime(1, 2, 3, 4, 5, 6, 7)) class DatetimeTimeTests(DatetimeTests): repr_ = repr(datetime.time(0)) def test_main(): test_support.run_unittest(HashEqualityTestCase, StrHashRandomizationTests, UnicodeHashRandomizationTests, BufferHashRandomizationTests, DatetimeDateTests, DatetimeDatetimeTests, DatetimeTimeTests) if __name__ == "__main__": test_main()