text: # test the invariant that
  #   iff a==b then hash(a)==hash(b)
  #
  # Also test that hash implementations are inherited as expected
  
  import unittest
  from test import support
  from collections import Hashable
  
  
  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))
          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))
  
  
  _default_hash = object.__hash__
  class DefaultHash(object): pass
  
  _FIXED_HASH_VALUE = 42
  class FixedHash(object):
      def __hash__(self):
          return _FIXED_HASH_VALUE
  
  class OnlyEquality(object):
      def __eq__(self, other):
          return self is other
  
  class OnlyInequality(object):
      def __ne__(self, other):
          return self is not other
  
  class InheritedHashWithEquality(FixedHash, OnlyEquality): pass
  class InheritedHashWithInequality(FixedHash, OnlyInequality): pass
  
  class NoHash(object):
      __hash__ = None
  
  class HashInheritanceTestCase(unittest.TestCase):
      default_expected = [object(),
                          DefaultHash(),
                          OnlyInequality(),
                         ]
      fixed_expected = [FixedHash(),
                        InheritedHashWithEquality(),
                        InheritedHashWithInequality(),
                        ]
      error_expected = [NoHash(),
                        OnlyEquality(),
                        ]
  
      def test_default_hash(self):
          for obj in self.default_expected:
              self.assertEqual(hash(obj), _default_hash(obj))
  
      def test_fixed_hash(self):
          for obj in self.fixed_expected:
              self.assertEqual(hash(obj), _FIXED_HASH_VALUE)
  
      def test_error_hash(self):
          for obj in self.error_expected:
              self.assertRaises(TypeError, hash, obj)
  
      def test_hashable(self):
          objects = (self.default_expected +
                     self.fixed_expected)
          for obj in objects:
              self.assertTrue(isinstance(obj, Hashable), repr(obj))
  
      def test_not_hashable(self):
          for obj in self.error_expected:
              self.assertFalse(isinstance(obj, Hashable), repr(obj))
  
  
  # Issue #4701: Check that some builtin types are correctly hashable
  class DefaultIterSeq(object):
      seq = range(10)
      def __len__(self):
          return len(self.seq)
      def __getitem__(self, index):
          return self.seq[index]
  
  class HashBuiltinsTestCase(unittest.TestCase):
      hashes_to_check = [range(10),
                         enumerate(range(10)),
                         iter(DefaultIterSeq()),
                         iter(lambda: 0, 0),
                        ]
  
      def test_hashes(self):
          _default_hash = object.__hash__
          for obj in self.hashes_to_check:
              self.assertEqual(hash(obj), _default_hash(obj))
  
  def test_main():
      support.run_unittest(HashEqualityTestCase,
                                HashInheritanceTestCase,
                                HashBuiltinsTestCase)
  
  
  if __name__ == "__main__":
      test_main()
  