cpython/Lib/test/test_hash.py

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# test the invariant that
# iff a==b then hash(a)==hash(b)
#
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import unittest
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
# the hash values are not all the same.
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hashed = map(hash, objlist)
for h in hashed[1:]:
if h != hashed[0]:
self.fail("hashed values differ: %s" % `objlist`)
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def test_numeric_literals(self):
self.same_hash(1, 1L, 1.0, 1.0+0.0j)
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def test_coerced_integers(self):
self.same_hash(int(1), long(1), float(1), complex(1),
int('1'), float('1.0'))
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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))
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def test_main():
test_support.run_unittest(HashEqualityTestCase)
if __name__ == "__main__":
test_main()