| # test the invariant that |
| # iff a==b then hash(a)==hash(b) |
| # |
| |
| import unittest |
| from test import support |
| |
| |
| 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 = list(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, 1, 1.0, 1.0+0.0j) |
| self.same_hash(0, 0.0, 0.0+0.0j) |
| self.same_hash(-1, -1.0, -1.0+0.0j) |
| self.same_hash(-2, -2.0, -2.0+0.0j) |
| |
| def test_coerced_integers(self): |
| self.same_hash(int(1), int(1), float(1), complex(1), |
| int('1'), float('1.0')) |
| self.same_hash(int(-2**31), float(-2**31)) |
| self.same_hash(int(1-2**31), float(1-2**31)) |
| self.same_hash(int(2**31-1), float(2**31-1)) |
| # for 64-bit platforms |
| self.same_hash(int(2**31), float(2**31)) |
| self.same_hash(int(-2**63), float(-2**63)) |
| |
| def test_coerced_floats(self): |
| self.same_hash(int(1.23e300), float(1.23e300)) |
| self.same_hash(float(0.5), complex(0.5, 0.0)) |
| |
| |
| def test_main(): |
| support.run_unittest(HashEqualityTestCase) |
| |
| |
| if __name__ == "__main__": |
| test_main() |