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d544df7ddd
predictable to being completely predictable. The value of hash(n) is unchanged for any n that's small enough to be representable as an int, and also unchanged for the vast majority of long integers n of reasonable size.
47 lines
1.5 KiB
Python
47 lines
1.5 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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import unittest
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from test import test_support
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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 = 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, 1L, 1.0, 1.0+0.0j)
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self.same_hash(0, 0L, 0.0, 0.0+0.0j)
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self.same_hash(-1, -1L, -1.0, -1.0+0.0j)
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self.same_hash(-2, -2L, -2.0, -2.0+0.0j)
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def test_coerced_integers(self):
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self.same_hash(int(1), long(1), float(1), complex(1),
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int('1'), float('1.0'))
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self.same_hash(int(-2**31), long(-2**31), float(-2**31))
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self.same_hash(int(1-2**31), long(1-2**31), float(1-2**31))
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self.same_hash(int(2**31-1), long(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), long(2**31), float(2**31))
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self.same_hash(int(-2**63), long(-2**63), float(-2**63))
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self.same_hash(int(1-2**63), long(1-2**63))
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self.same_hash(int(2**63-1), long(2**63-1))
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def test_coerced_floats(self):
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self.same_hash(long(1.23e300), float(1.23e300))
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self.same_hash(float(0.5), complex(0.5, 0.0))
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def test_main():
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test_support.run_unittest(HashEqualityTestCase)
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if __name__ == "__main__":
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test_main()
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