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1 files changed, 144 insertions, 0 deletions

diff --git a/src/python/stdlib/test/test_hash.py b/src/python/stdlib/test/test_hash.py
new file mode 100644
index 0000000..d2571d0
--- /dev/null
+++ b/src/python/stdlib/test/test_hash.py
@@ -0,0 +1,144 @@
+# 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 test_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 = 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, 1L, 1.0, 1.0+0.0j)
+        self.same_hash(0, 0L, 0.0, 0.0+0.0j)
+        self.same_hash(-1, -1L, -1.0, -1.0+0.0j)
+        self.same_hash(-2, -2L, -2.0, -2.0+0.0j)
+
+    def test_coerced_integers(self):
+        self.same_hash(int(1), long(1), float(1), complex(1),
+                       int('1'), float('1.0'))
+        self.same_hash(int(-2**31), long(-2**31), float(-2**31))
+        self.same_hash(int(1-2**31), long(1-2**31), float(1-2**31))
+        self.same_hash(int(2**31-1), long(2**31-1), float(2**31-1))
+        # for 64-bit platforms
+        self.same_hash(int(2**31), long(2**31), float(2**31))
+        self.same_hash(int(-2**63), long(-2**63), float(-2**63))
+        self.same_hash(int(1-2**63), long(1-2**63))
+        self.same_hash(int(2**63-1), long(2**63-1))
+        self.same_hash(long(2**63), float(2**63))
+
+    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))
+
+
+_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
+    # Trick to suppress Py3k warning in 2.x
+    __hash__ = None
+del OnlyEquality.__hash__
+
+class OnlyInequality(object):
+    def __ne__(self, other):
+        return self is not other
+
+class OnlyCmp(object):
+    def __cmp__(self, other):
+        return cmp(id(self), id(other))
+    # Trick to suppress Py3k warning in 2.x
+    __hash__ = None
+del OnlyCmp.__hash__
+
+class InheritedHashWithEquality(FixedHash, OnlyEquality): pass
+class InheritedHashWithInequality(FixedHash, OnlyInequality): pass
+class InheritedHashWithCmp(FixedHash, OnlyCmp): pass
+
+class NoHash(object):
+    __hash__ = None
+
+class HashInheritanceTestCase(unittest.TestCase):
+    default_expected = [object(),
+                        DefaultHash(),
+                        OnlyEquality(),
+                        OnlyInequality(),
+                        OnlyCmp(),
+                       ]
+    fixed_expected = [FixedHash(),
+                      InheritedHashWithEquality(),
+                      InheritedHashWithInequality(),
+                      InheritedHashWithCmp(),
+                      ]
+    error_expected = [NoHash()]
+
+    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.assertIsInstance(obj, Hashable)
+
+    def test_not_hashable(self):
+        for obj in self.error_expected:
+            self.assertNotIsInstance(obj, Hashable)
+
+
+# Issue #4701: Check that some builtin types are correctly hashable
+#  (This test only used to fail in Python 3.0, but has been included
+#   in 2.x along with the lazy call to PyType_Ready in PyObject_Hash)
+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 = [xrange(10),
+                       enumerate(xrange(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():
+    test_support.run_unittest(HashEqualityTestCase,
+                              HashInheritanceTestCase,
+                              HashBuiltinsTestCase)
+
+
+if __name__ == "__main__":
+    test_main()