diff --git a/Lib/test/mapping_tests.py b/Lib/test/mapping_tests.py
index 4b0f797..c6857ab 100644
--- a/Lib/test/mapping_tests.py
+++ b/Lib/test/mapping_tests.py
@@ -557,6 +557,8 @@
         class BadEq(object):
             def __eq__(self, other):
                 raise Exc()
+            def __hash__(self):
+                return 24
 
         d = self._empty_mapping()
         d[BadEq()] = 42
@@ -642,6 +644,8 @@
         class BadCmp(object):
             def __eq__(self, other):
                 raise Exc()
+            def __hash__(self):
+                return 42
 
         d1 = self._full_mapping({BadCmp(): 1})
         d2 = self._full_mapping({1: 1})
diff --git a/Lib/test/regrtest.py b/Lib/test/regrtest.py
index 7973b23..9694e2a 100755
--- a/Lib/test/regrtest.py
+++ b/Lib/test/regrtest.py
@@ -648,7 +648,7 @@
 
 def dash_R(the_module, test, indirect_test, huntrleaks):
     # This code is hackish and inelegant, but it seems to do the job.
-    import copy_reg
+    import copy_reg, _abcoll
 
     if not hasattr(sys, 'gettotalrefcount'):
         raise Exception("Tracking reference leaks requires a debug build "
@@ -658,6 +658,12 @@
     fs = warnings.filters[:]
     ps = copy_reg.dispatch_table.copy()
     pic = sys.path_importer_cache.copy()
+    abcs = {}
+    for abc in [getattr(_abcoll, a) for a in _abcoll.__all__]:
+        for obj in abc.__subclasses__() + [abc]:
+            abcs[obj] = obj._abc_registry.copy()
+
+    print >> sys.stderr, abcs
 
     if indirect_test:
         def run_the_test():
@@ -671,12 +677,12 @@
     repcount = nwarmup + ntracked
     print >> sys.stderr, "beginning", repcount, "repetitions"
     print >> sys.stderr, ("1234567890"*(repcount//10 + 1))[:repcount]
-    dash_R_cleanup(fs, ps, pic)
+    dash_R_cleanup(fs, ps, pic, abcs)
     for i in range(repcount):
         rc = sys.gettotalrefcount()
         run_the_test()
         sys.stderr.write('.')
-        dash_R_cleanup(fs, ps, pic)
+        dash_R_cleanup(fs, ps, pic, abcs)
         if i >= nwarmup:
             deltas.append(sys.gettotalrefcount() - rc - 2)
     print >> sys.stderr
@@ -687,11 +693,11 @@
         print >> refrep, msg
         refrep.close()
 
-def dash_R_cleanup(fs, ps, pic):
+def dash_R_cleanup(fs, ps, pic, abcs):
     import gc, copy_reg
     import _strptime, linecache, dircache
     import urlparse, urllib, urllib2, mimetypes, doctest
-    import struct, filecmp
+    import struct, filecmp, _abcoll
     from distutils.dir_util import _path_created
 
     # Restore some original values.
@@ -701,6 +707,13 @@
     sys.path_importer_cache.clear()
     sys.path_importer_cache.update(pic)
 
+    # Clear ABC registries, restoring previously saved ABC registries.
+    for abc in [getattr(_abcoll, a) for a in _abcoll.__all__]:
+        for obj in abc.__subclasses__() + [abc]:
+            obj._abc_registry = abcs.get(obj, {}).copy()
+            obj._abc_cache.clear()
+            obj._abc_negative_cache.clear()
+
     # Clear assorted module caches.
     _path_created.clear()
     re.purge()
diff --git a/Lib/test/test_abc.py b/Lib/test/test_abc.py
index 3fd9bde..c760356 100644
--- a/Lib/test/test_abc.py
+++ b/Lib/test/test_abc.py
@@ -133,6 +133,20 @@
         self.failUnless(issubclass(MyInt, A))
         self.failUnless(isinstance(42, A))
 
+    def test_all_new_methods_are_called(self):
+        class A:
+            __metaclass__ = abc.ABCMeta
+        class B:
+            counter = 0
+            def __new__(cls):
+                B.counter += 1
+                return super(B, cls).__new__(cls)
+        class C(A, B):
+            pass
+        self.assertEqual(B.counter, 0)
+        C()
+        self.assertEqual(B.counter, 1)
+
 
 def test_main():
     test_support.run_unittest(TestABC)
diff --git a/Lib/test/test_collections.py b/Lib/test/test_collections.py
index 7c5b2dc..52bae9a 100644
--- a/Lib/test/test_collections.py
+++ b/Lib/test/test_collections.py
@@ -1,6 +1,12 @@
 import unittest
 from test import test_support
 from collections import namedtuple
+from collections import Hashable, Iterable, Iterator
+from collections import Sized, Container, Callable
+from collections import Set, MutableSet
+from collections import Mapping, MutableMapping
+from collections import Sequence, MutableSequence
+
 
 class TestNamedTuple(unittest.TestCase):
 
@@ -86,9 +92,187 @@
         Dot = namedtuple('Dot', 'd')
         self.assertEqual(Dot(1), (1,))
 
+
+class TestOneTrickPonyABCs(unittest.TestCase):
+
+    def test_Hashable(self):
+        # Check some non-hashables
+        non_samples = [list(), set(), dict()]
+        for x in non_samples:
+            self.failIf(isinstance(x, Hashable), repr(x))
+            self.failIf(issubclass(type(x), Hashable), repr(type(x)))
+        # Check some hashables
+        samples = [None,
+                   int(), float(), complex(),
+                   str(),
+                   tuple(), frozenset(),
+                   int, list, object, type,
+                   ]
+        for x in samples:
+            self.failUnless(isinstance(x, Hashable), repr(x))
+            self.failUnless(issubclass(type(x), Hashable), repr(type(x)))
+        self.assertRaises(TypeError, Hashable)
+        # Check direct subclassing
+        class H(Hashable):
+            def __hash__(self):
+                return super(H, self).__hash__()
+        self.assertEqual(hash(H()), 0)
+        self.failIf(issubclass(int, H))
+
+    def test_Iterable(self):
+        # Check some non-iterables
+        non_samples = [None, 42, 3.14, 1j]
+        for x in non_samples:
+            self.failIf(isinstance(x, Iterable), repr(x))
+            self.failIf(issubclass(type(x), Iterable), repr(type(x)))
+        # Check some iterables
+        samples = [str(),
+                   tuple(), list(), set(), frozenset(), dict(),
+                   dict().keys(), dict().items(), dict().values(),
+                   (lambda: (yield))(),
+                   (x for x in []),
+                   ]
+        for x in samples:
+            self.failUnless(isinstance(x, Iterable), repr(x))
+            self.failUnless(issubclass(type(x), Iterable), repr(type(x)))
+        # Check direct subclassing
+        class I(Iterable):
+            def __iter__(self):
+                return super(I, self).__iter__()
+        self.assertEqual(list(I()), [])
+        self.failIf(issubclass(str, I))
+
+    def test_Iterator(self):
+        non_samples = [None, 42, 3.14, 1j, "".encode('ascii'), "", (), [],
+            {}, set()]
+        for x in non_samples:
+            self.failIf(isinstance(x, Iterator), repr(x))
+            self.failIf(issubclass(type(x), Iterator), repr(type(x)))
+        samples = [iter(str()),
+                   iter(tuple()), iter(list()), iter(dict()),
+                   iter(set()), iter(frozenset()),
+                   iter(dict().keys()), iter(dict().items()),
+                   iter(dict().values()),
+                   (lambda: (yield))(),
+                   (x for x in []),
+                   ]
+        for x in samples:
+            self.failUnless(isinstance(x, Iterator), repr(x))
+            self.failUnless(issubclass(type(x), Iterator), repr(type(x)))
+
+    def test_Sized(self):
+        non_samples = [None, 42, 3.14, 1j,
+                       (lambda: (yield))(),
+                       (x for x in []),
+                       ]
+        for x in non_samples:
+            self.failIf(isinstance(x, Sized), repr(x))
+            self.failIf(issubclass(type(x), Sized), repr(type(x)))
+        samples = [str(),
+                   tuple(), list(), set(), frozenset(), dict(),
+                   dict().keys(), dict().items(), dict().values(),
+                   ]
+        for x in samples:
+            self.failUnless(isinstance(x, Sized), repr(x))
+            self.failUnless(issubclass(type(x), Sized), repr(type(x)))
+
+    def test_Container(self):
+        non_samples = [None, 42, 3.14, 1j,
+                       (lambda: (yield))(),
+                       (x for x in []),
+                       ]
+        for x in non_samples:
+            self.failIf(isinstance(x, Container), repr(x))
+            self.failIf(issubclass(type(x), Container), repr(type(x)))
+        samples = [str(),
+                   tuple(), list(), set(), frozenset(), dict(),
+                   dict().keys(), dict().items(),
+                   ]
+        for x in samples:
+            self.failUnless(isinstance(x, Container), repr(x))
+            self.failUnless(issubclass(type(x), Container), repr(type(x)))
+
+    def test_Callable(self):
+        non_samples = [None, 42, 3.14, 1j,
+                       "", "".encode('ascii'), (), [], {}, set(),
+                       (lambda: (yield))(),
+                       (x for x in []),
+                       ]
+        for x in non_samples:
+            self.failIf(isinstance(x, Callable), repr(x))
+            self.failIf(issubclass(type(x), Callable), repr(type(x)))
+        samples = [lambda: None,
+                   type, int, object,
+                   len,
+                   list.append, [].append,
+                   ]
+        for x in samples:
+            self.failUnless(isinstance(x, Callable), repr(x))
+            self.failUnless(issubclass(type(x), Callable), repr(type(x)))
+
+    def test_direct_subclassing(self):
+        for B in Hashable, Iterable, Iterator, Sized, Container, Callable:
+            class C(B):
+                pass
+            self.failUnless(issubclass(C, B))
+            self.failIf(issubclass(int, C))
+
+    def test_registration(self):
+        for B in Hashable, Iterable, Iterator, Sized, Container, Callable:
+            class C:
+                __metaclass__ = type
+                __hash__ = None  # Make sure it isn't hashable by default
+            self.failIf(issubclass(C, B), B.__name__)
+            B.register(C)
+            self.failUnless(issubclass(C, B))
+
+
+class TestCollectionABCs(unittest.TestCase):
+
+    # XXX For now, we only test some virtual inheritance properties.
+    # We should also test the proper behavior of the collection ABCs
+    # as real base classes or mix-in classes.
+
+    def test_Set(self):
+        for sample in [set, frozenset]:
+            self.failUnless(isinstance(sample(), Set))
+            self.failUnless(issubclass(sample, Set))
+
+    def test_MutableSet(self):
+        self.failUnless(isinstance(set(), MutableSet))
+        self.failUnless(issubclass(set, MutableSet))
+        self.failIf(isinstance(frozenset(), MutableSet))
+        self.failIf(issubclass(frozenset, MutableSet))
+
+    def test_Mapping(self):
+        for sample in [dict]:
+            self.failUnless(isinstance(sample(), Mapping))
+            self.failUnless(issubclass(sample, Mapping))
+
+    def test_MutableMapping(self):
+        for sample in [dict]:
+            self.failUnless(isinstance(sample(), MutableMapping))
+            self.failUnless(issubclass(sample, MutableMapping))
+
+    def test_Sequence(self):
+        for sample in [tuple, list, str]:
+            self.failUnless(isinstance(sample(), Sequence))
+            self.failUnless(issubclass(sample, Sequence))
+        self.failUnless(issubclass(basestring, Sequence))
+
+    def test_MutableSequence(self):
+        for sample in [tuple, str]:
+            self.failIf(isinstance(sample(), MutableSequence))
+            self.failIf(issubclass(sample, MutableSequence))
+        for sample in [list]:
+            self.failUnless(isinstance(sample(), MutableSequence))
+            self.failUnless(issubclass(sample, MutableSequence))
+        self.failIf(issubclass(basestring, MutableSequence))
+
+
 def test_main(verbose=None):
     import collections as CollectionsModule
-    test_classes = [TestNamedTuple]
+    test_classes = [TestNamedTuple, TestOneTrickPonyABCs, TestCollectionABCs]
     test_support.run_unittest(*test_classes)
     test_support.run_doctest(CollectionsModule, verbose)
 
diff --git a/Lib/test/test_dict.py b/Lib/test/test_dict.py
index 9f049ad..342e775 100644
--- a/Lib/test/test_dict.py
+++ b/Lib/test/test_dict.py
@@ -86,6 +86,8 @@
         class BadEq(object):
             def __eq__(self, other):
                 raise Exc()
+            def __hash__(self):
+                return 24
 
         d = {}
         d[BadEq()] = 42
@@ -397,6 +399,8 @@
         class BadCmp(object):
             def __eq__(self, other):
                 raise Exc()
+            def __hash__(self):
+                return 42
 
         d1 = {BadCmp(): 1}
         d2 = {1: 1}