229 lines
7.1 KiB
Python
229 lines
7.1 KiB
Python
# test the invariant that
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# iff a==b then hash(a)==hash(b)
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#
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# Also test that hash implementations are inherited as expected
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import datetime
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import os
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import sys
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import unittest
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from test import support
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from test.script_helper import assert_python_ok
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from collections import Hashable
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IS_64BIT = sys.maxsize > 2**32
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class HashEqualityTestCase(unittest.TestCase):
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def same_hash(self, *objlist):
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# Hash each object given and fail if
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# the hash values are not all the same.
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hashed = list(map(hash, objlist))
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for h in hashed[1:]:
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if h != hashed[0]:
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self.fail("hashed values differ: %r" % (objlist,))
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def test_numeric_literals(self):
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self.same_hash(1, 1, 1.0, 1.0+0.0j)
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self.same_hash(0, 0.0, 0.0+0.0j)
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self.same_hash(-1, -1.0, -1.0+0.0j)
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self.same_hash(-2, -2.0, -2.0+0.0j)
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def test_coerced_integers(self):
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self.same_hash(int(1), int(1), float(1), complex(1),
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int('1'), float('1.0'))
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self.same_hash(int(-2**31), float(-2**31))
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self.same_hash(int(1-2**31), float(1-2**31))
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self.same_hash(int(2**31-1), float(2**31-1))
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# for 64-bit platforms
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self.same_hash(int(2**31), float(2**31))
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self.same_hash(int(-2**63), float(-2**63))
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self.same_hash(int(2**63), float(2**63))
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def test_coerced_floats(self):
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self.same_hash(int(1.23e300), float(1.23e300))
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self.same_hash(float(0.5), complex(0.5, 0.0))
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_default_hash = object.__hash__
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class DefaultHash(object): pass
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_FIXED_HASH_VALUE = 42
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class FixedHash(object):
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def __hash__(self):
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return _FIXED_HASH_VALUE
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class OnlyEquality(object):
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def __eq__(self, other):
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return self is other
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class OnlyInequality(object):
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def __ne__(self, other):
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return self is not other
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class InheritedHashWithEquality(FixedHash, OnlyEquality): pass
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class InheritedHashWithInequality(FixedHash, OnlyInequality): pass
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class NoHash(object):
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__hash__ = None
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class HashInheritanceTestCase(unittest.TestCase):
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default_expected = [object(),
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DefaultHash(),
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OnlyInequality(),
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]
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fixed_expected = [FixedHash(),
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InheritedHashWithEquality(),
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InheritedHashWithInequality(),
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]
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error_expected = [NoHash(),
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OnlyEquality(),
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]
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def test_default_hash(self):
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for obj in self.default_expected:
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self.assertEqual(hash(obj), _default_hash(obj))
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def test_fixed_hash(self):
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for obj in self.fixed_expected:
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self.assertEqual(hash(obj), _FIXED_HASH_VALUE)
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def test_error_hash(self):
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for obj in self.error_expected:
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self.assertRaises(TypeError, hash, obj)
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def test_hashable(self):
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objects = (self.default_expected +
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self.fixed_expected)
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for obj in objects:
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self.assertIsInstance(obj, Hashable)
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def test_not_hashable(self):
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for obj in self.error_expected:
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self.assertNotIsInstance(obj, Hashable)
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# Issue #4701: Check that some builtin types are correctly hashable
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class DefaultIterSeq(object):
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seq = range(10)
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def __len__(self):
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return len(self.seq)
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def __getitem__(self, index):
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return self.seq[index]
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class HashBuiltinsTestCase(unittest.TestCase):
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hashes_to_check = [enumerate(range(10)),
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iter(DefaultIterSeq()),
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iter(lambda: 0, 0),
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]
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def test_hashes(self):
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_default_hash = object.__hash__
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for obj in self.hashes_to_check:
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self.assertEqual(hash(obj), _default_hash(obj))
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class HashRandomizationTests(unittest.TestCase):
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# Each subclass should define a field "repr_", containing the repr() of
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# an object to be tested
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def get_hash_command(self, repr_):
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return 'print(hash(%s))' % repr_
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def get_hash(self, repr_, seed=None):
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env = os.environ.copy()
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env['__cleanenv'] = True # signal to assert_python not to do a copy
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# of os.environ on its own
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if seed is not None:
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env['PYTHONHASHSEED'] = str(seed)
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else:
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env.pop('PYTHONHASHSEED', None)
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out = assert_python_ok(
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'-c', self.get_hash_command(repr_),
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**env)
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stdout = out[1].strip()
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return int(stdout)
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def test_randomized_hash(self):
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# two runs should return different hashes
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run1 = self.get_hash(self.repr_, seed='random')
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run2 = self.get_hash(self.repr_, seed='random')
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self.assertNotEqual(run1, run2)
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class StringlikeHashRandomizationTests(HashRandomizationTests):
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def test_null_hash(self):
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# PYTHONHASHSEED=0 disables the randomized hash
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if IS_64BIT:
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known_hash_of_obj = 1453079729188098211
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else:
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known_hash_of_obj = -1600925533
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# Randomization is enabled by default:
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self.assertNotEqual(self.get_hash(self.repr_), known_hash_of_obj)
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# It can also be disabled by setting the seed to 0:
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self.assertEqual(self.get_hash(self.repr_, seed=0), known_hash_of_obj)
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def test_fixed_hash(self):
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# test a fixed seed for the randomized hash
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# Note that all types share the same values:
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if IS_64BIT:
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if sys.byteorder == 'little':
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h = -4410911502303878509
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else:
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h = -3570150969479994130
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else:
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if sys.byteorder == 'little':
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h = -206076799
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else:
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h = -1024014457
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self.assertEqual(self.get_hash(self.repr_, seed=42), h)
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class StrHashRandomizationTests(StringlikeHashRandomizationTests):
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repr_ = repr('abc')
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def test_empty_string(self):
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self.assertEqual(hash(""), 0)
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class BytesHashRandomizationTests(StringlikeHashRandomizationTests):
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repr_ = repr(b'abc')
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def test_empty_string(self):
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self.assertEqual(hash(b""), 0)
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class MemoryviewHashRandomizationTests(StringlikeHashRandomizationTests):
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repr_ = "memoryview(b'abc')"
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def test_empty_string(self):
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self.assertEqual(hash(memoryview(b"")), 0)
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class DatetimeTests(HashRandomizationTests):
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def get_hash_command(self, repr_):
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return 'import datetime; print(hash(%s))' % repr_
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class DatetimeDateTests(DatetimeTests):
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repr_ = repr(datetime.date(1066, 10, 14))
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class DatetimeDatetimeTests(DatetimeTests):
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repr_ = repr(datetime.datetime(1, 2, 3, 4, 5, 6, 7))
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class DatetimeTimeTests(DatetimeTests):
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repr_ = repr(datetime.time(0))
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def test_main():
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support.run_unittest(HashEqualityTestCase,
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HashInheritanceTestCase,
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HashBuiltinsTestCase,
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StrHashRandomizationTests,
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BytesHashRandomizationTests,
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MemoryviewHashRandomizationTests,
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DatetimeDateTests,
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DatetimeDatetimeTests,
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DatetimeTimeTests)
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if __name__ == "__main__":
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test_main()
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