Lib/test/test_hash.py

   1 # test the invariant that
   2 #   iff a==b then hash(a)==hash(b)
   3 #
   4
   5 import unittest
   6 from test import test_support
   7
   8
   9 class HashEqualityTestCase(unittest.TestCase):
  10
  11     def same_hash(self, *objlist):
  12         # Hash each object given and fail if
  13         # the hash values are not all the same.
  14         hashed = map(hash, objlist)
  15         for h in hashed[1:]:
  16             if h != hashed[0]:
  17                 self.fail("hashed values differ: %s" % `objlist`)
  18
  19     def test_numeric_literals(self):
  20         self.same_hash(1, 1L, 1.0, 1.0+0.0j)
  21
  22     def test_coerced_integers(self):
  23         self.same_hash(int(1), long(1), float(1), complex(1),
  24                        int('1'), float('1.0'))
  25
  26     def test_coerced_floats(self):
  27         self.same_hash(long(1.23e300), float(1.23e300))
  28         self.same_hash(float(0.5), complex(0.5, 0.0))
  29
  30
  31 def test_main():
  32     test_support.run_unittest(HashEqualityTestCase)
  33
  34
  35 if __name__ == "__main__":
  36     test_main()