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diff --git a/contrib/python/zope.interface/py2/zope/interface/tests/test_registry.py b/contrib/python/zope.interface/py2/zope/interface/tests/test_registry.py
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+##############################################################################
+#
+# Copyright (c) 2001, 2002, 2009 Zope Foundation and Contributors.
+# All Rights Reserved.
+#
+# This software is subject to the provisions of the Zope Public License,
+# Version 2.1 (ZPL).  A copy of the ZPL should accompany this distribution.
+# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
+# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
+# FOR A PARTICULAR PURPOSE.
+#
+##############################################################################
+"""Component Registry Tests"""
+# pylint:disable=protected-access
+import unittest
+
+from zope.interface import Interface
+from zope.interface.adapter import VerifyingAdapterRegistry
+
+from zope.interface.registry import Components
+
+class ComponentsTests(unittest.TestCase):
+
+    def _getTargetClass(self):
+        return Components
+
+    def _makeOne(self, name='test', *args, **kw):
+        return self._getTargetClass()(name, *args, **kw)
+
+    def _wrapEvents(self):
+        from zope.interface import registry
+        _events = []
+        def _notify(*args, **kw):
+            _events.append((args, kw))
+        _monkey = _Monkey(registry, notify=_notify)
+        return _monkey, _events
+
+    def test_ctor_no_bases(self):
+        from zope.interface.adapter import AdapterRegistry
+        comp = self._makeOne('testing')
+        self.assertEqual(comp.__name__, 'testing')
+        self.assertEqual(comp.__bases__, ())
+        self.assertTrue(isinstance(comp.adapters, AdapterRegistry))
+        self.assertTrue(isinstance(comp.utilities, AdapterRegistry))
+        self.assertEqual(comp.adapters.__bases__, ())
+        self.assertEqual(comp.utilities.__bases__, ())
+        self.assertEqual(comp._utility_registrations, {})
+        self.assertEqual(comp._adapter_registrations, {})
+        self.assertEqual(comp._subscription_registrations, [])
+        self.assertEqual(comp._handler_registrations, [])
+
+    def test_ctor_w_base(self):
+        base = self._makeOne('base')
+        comp = self._makeOne('testing', (base,))
+        self.assertEqual(comp.__name__, 'testing')
+        self.assertEqual(comp.__bases__, (base,))
+        self.assertEqual(comp.adapters.__bases__, (base.adapters,))
+        self.assertEqual(comp.utilities.__bases__, (base.utilities,))
+
+    def test___repr__(self):
+        comp = self._makeOne('testing')
+        self.assertEqual(repr(comp), '<Components testing>')
+
+    # test _init_registries / _init_registrations via only caller, __init__.
+
+    def test_assign_to___bases__(self):
+        base1 = self._makeOne('base1')
+        base2 = self._makeOne('base2')
+        comp = self._makeOne()
+        comp.__bases__ = (base1, base2)
+        self.assertEqual(comp.__bases__, (base1, base2))
+        self.assertEqual(comp.adapters.__bases__,
+                         (base1.adapters, base2.adapters))
+        self.assertEqual(comp.utilities.__bases__,
+                         (base1.utilities, base2.utilities))
+
+    def test_registerUtility_with_component_name(self):
+        from zope.interface.declarations import named, InterfaceClass
+
+
+        class IFoo(InterfaceClass):
+            pass
+        ifoo = IFoo('IFoo')
+
+        @named(u'foo')
+        class Foo(object):
+            pass
+        foo = Foo()
+        _info = u'info'
+
+        comp = self._makeOne()
+        comp.registerUtility(foo, ifoo, info=_info)
+        self.assertEqual(
+            comp._utility_registrations[ifoo, u'foo'],
+            (foo, _info, None))
+
+    def test_registerUtility_both_factory_and_component(self):
+        def _factory():
+            raise NotImplementedError()
+        _to_reg = object()
+        comp = self._makeOne()
+        self.assertRaises(TypeError, comp.registerUtility,
+                          component=_to_reg, factory=_factory)
+
+    def test_registerUtility_w_component(self):
+        from zope.interface.declarations import InterfaceClass
+        from zope.interface.interfaces import Registered
+        from zope.interface.registry import UtilityRegistration
+
+        class IFoo(InterfaceClass):
+            pass
+        ifoo = IFoo('IFoo')
+        _info = u'info'
+        _name = u'name'
+        _to_reg = object()
+        comp = self._makeOne()
+        _monkey, _events = self._wrapEvents()
+        with _monkey:
+            comp.registerUtility(_to_reg, ifoo, _name, _info)
+        self.assertTrue(comp.utilities._adapters[0][ifoo][_name] is _to_reg)
+        self.assertEqual(comp._utility_registrations[ifoo, _name],
+                         (_to_reg, _info, None))
+        self.assertEqual(comp.utilities._subscribers[0][ifoo][''], (_to_reg,))
+        self.assertEqual(len(_events), 1)
+        args, kw = _events[0]
+        event, = args
+        self.assertEqual(kw, {})
+        self.assertTrue(isinstance(event, Registered))
+        self.assertTrue(isinstance(event.object, UtilityRegistration))
+        self.assertTrue(event.object.registry is comp)
+        self.assertTrue(event.object.provided is ifoo)
+        self.assertTrue(event.object.name is _name)
+        self.assertTrue(event.object.component is _to_reg)
+        self.assertTrue(event.object.info is _info)
+        self.assertTrue(event.object.factory is None)
+
+    def test_registerUtility_w_factory(self):
+        from zope.interface.declarations import InterfaceClass
+        from zope.interface.interfaces import Registered
+        from zope.interface.registry import UtilityRegistration
+
+        class IFoo(InterfaceClass):
+            pass
+        ifoo = IFoo('IFoo')
+        _info = u'info'
+        _name = u'name'
+        _to_reg = object()
+        def _factory():
+            return _to_reg
+        comp = self._makeOne()
+        _monkey, _events = self._wrapEvents()
+        with _monkey:
+            comp.registerUtility(None, ifoo, _name, _info, factory=_factory)
+        self.assertEqual(len(_events), 1)
+        args, kw = _events[0]
+        event, = args
+        self.assertEqual(kw, {})
+        self.assertTrue(isinstance(event, Registered))
+        self.assertTrue(isinstance(event.object, UtilityRegistration))
+        self.assertTrue(event.object.registry is comp)
+        self.assertTrue(event.object.provided is ifoo)
+        self.assertTrue(event.object.name is _name)
+        self.assertTrue(event.object.component is _to_reg)
+        self.assertTrue(event.object.info is _info)
+        self.assertTrue(event.object.factory is _factory)
+
+    def test_registerUtility_no_provided_available(self):
+        class Foo(object):
+            pass
+
+        _info = u'info'
+        _name = u'name'
+        _to_reg = Foo()
+        comp = self._makeOne()
+        self.assertRaises(TypeError,
+                          comp.registerUtility, _to_reg, None, _name, _info)
+
+    def test_registerUtility_wo_provided(self):
+        from zope.interface.declarations import directlyProvides
+        from zope.interface.declarations import InterfaceClass
+        from zope.interface.interfaces import Registered
+        from zope.interface.registry import UtilityRegistration
+
+        class IFoo(InterfaceClass):
+            pass
+        class Foo(object):
+            pass
+        ifoo = IFoo('IFoo')
+        _info = u'info'
+        _name = u'name'
+        _to_reg = Foo()
+        directlyProvides(_to_reg, ifoo)
+        comp = self._makeOne()
+        _monkey, _events = self._wrapEvents()
+        with _monkey:
+            comp.registerUtility(_to_reg, None, _name, _info)
+        self.assertEqual(len(_events), 1)
+        args, kw = _events[0]
+        event, = args
+        self.assertEqual(kw, {})
+        self.assertTrue(isinstance(event, Registered))
+        self.assertTrue(isinstance(event.object, UtilityRegistration))
+        self.assertTrue(event.object.registry is comp)
+        self.assertTrue(event.object.provided is ifoo)
+        self.assertTrue(event.object.name is _name)
+        self.assertTrue(event.object.component is _to_reg)
+        self.assertTrue(event.object.info is _info)
+        self.assertTrue(event.object.factory is None)
+
+    def test_registerUtility_duplicates_existing_reg(self):
+        from zope.interface.declarations import InterfaceClass
+
+        class IFoo(InterfaceClass):
+            pass
+        ifoo = IFoo('IFoo')
+        _info = u'info'
+        _name = u'name'
+        _to_reg = object()
+        comp = self._makeOne()
+        comp.registerUtility(_to_reg, ifoo, _name, _info)
+        _monkey, _events = self._wrapEvents()
+        with _monkey:
+            comp.registerUtility(_to_reg, ifoo, _name, _info)
+        self.assertEqual(len(_events), 0)
+
+    def test_registerUtility_w_different_info(self):
+        from zope.interface.declarations import InterfaceClass
+
+        class IFoo(InterfaceClass):
+            pass
+        ifoo = IFoo('IFoo')
+        _info1 = u'info1'
+        _info2 = u'info2'
+        _name = u'name'
+        _to_reg = object()
+        comp = self._makeOne()
+        comp.registerUtility(_to_reg, ifoo, _name, _info1)
+        _monkey, _events = self._wrapEvents()
+        with _monkey:
+            comp.registerUtility(_to_reg, ifoo, _name, _info2)
+        self.assertEqual(len(_events), 2)  # unreg, reg
+        self.assertEqual(comp._utility_registrations[(ifoo, _name)],
+                         (_to_reg, _info2, None))  # replaced
+        self.assertEqual(comp.utilities._subscribers[0][ifoo][u''],
+                         (_to_reg,))
+
+    def test_registerUtility_w_different_names_same_component(self):
+        from zope.interface.declarations import InterfaceClass
+
+        class IFoo(InterfaceClass):
+            pass
+        ifoo = IFoo('IFoo')
+        _info = u'info'
+        _name1 = u'name1'
+        _name2 = u'name2'
+        _other_reg = object()
+        _to_reg = object()
+        comp = self._makeOne()
+        comp.registerUtility(_other_reg, ifoo, _name1, _info)
+        _monkey, _events = self._wrapEvents()
+        with _monkey:
+            comp.registerUtility(_to_reg, ifoo, _name2, _info)
+        self.assertEqual(len(_events), 1)  # reg
+        self.assertEqual(comp._utility_registrations[(ifoo, _name1)],
+                         (_other_reg, _info, None))
+        self.assertEqual(comp._utility_registrations[(ifoo, _name2)],
+                         (_to_reg, _info, None))
+        self.assertEqual(comp.utilities._subscribers[0][ifoo][u''],
+                         (_other_reg, _to_reg,))
+
+    def test_registerUtility_replaces_existing_reg(self):
+        from zope.interface.declarations import InterfaceClass
+        from zope.interface.interfaces import Unregistered
+        from zope.interface.interfaces import Registered
+        from zope.interface.registry import UtilityRegistration
+
+        class IFoo(InterfaceClass):
+            pass
+        ifoo = IFoo('IFoo')
+        _info = u'info'
+        _name = u'name'
+        _before, _after = object(), object()
+        comp = self._makeOne()
+        comp.registerUtility(_before, ifoo, _name, _info)
+        _monkey, _events = self._wrapEvents()
+        with _monkey:
+            comp.registerUtility(_after, ifoo, _name, _info)
+        self.assertEqual(len(_events), 2)
+        args, kw = _events[0]
+        event, = args
+        self.assertEqual(kw, {})
+        self.assertTrue(isinstance(event, Unregistered))
+        self.assertTrue(isinstance(event.object, UtilityRegistration))
+        self.assertTrue(event.object.registry is comp)
+        self.assertTrue(event.object.provided is ifoo)
+        self.assertTrue(event.object.name is _name)
+        self.assertTrue(event.object.component is _before)
+        self.assertTrue(event.object.info is _info)
+        self.assertTrue(event.object.factory is None)
+        args, kw = _events[1]
+        event, = args
+        self.assertEqual(kw, {})
+        self.assertTrue(isinstance(event, Registered))
+        self.assertTrue(isinstance(event.object, UtilityRegistration))
+        self.assertTrue(event.object.registry is comp)
+        self.assertTrue(event.object.provided is ifoo)
+        self.assertTrue(event.object.name is _name)
+        self.assertTrue(event.object.component is _after)
+        self.assertTrue(event.object.info is _info)
+        self.assertTrue(event.object.factory is None)
+
+    def test_registerUtility_w_existing_subscr(self):
+        from zope.interface.declarations import InterfaceClass
+
+        class IFoo(InterfaceClass):
+            pass
+        ifoo = IFoo('IFoo')
+        _info = u'info'
+        _name1 = u'name1'
+        _name2 = u'name2'
+        _to_reg = object()
+        comp = self._makeOne()
+        comp.registerUtility(_to_reg, ifoo, _name1, _info)
+        _monkey, _events = self._wrapEvents()
+        with _monkey:
+            comp.registerUtility(_to_reg, ifoo, _name2, _info)
+        self.assertEqual(comp.utilities._subscribers[0][ifoo][''], (_to_reg,))
+
+    def test_registerUtility_wo_event(self):
+        from zope.interface.declarations import InterfaceClass
+
+        class IFoo(InterfaceClass):
+            pass
+        ifoo = IFoo('IFoo')
+        _info = u'info'
+        _name = u'name'
+        _to_reg = object()
+        comp = self._makeOne()
+        _monkey, _events = self._wrapEvents()
+        with _monkey:
+            comp.registerUtility(_to_reg, ifoo, _name, _info, False)
+        self.assertEqual(len(_events), 0)
+
+    def test_registerUtility_changes_object_identity_after(self):
+        # If a subclass changes the identity of the _utility_registrations,
+        # the cache is updated and the right thing still happens.
+        class CompThatChangesAfter1Reg(self._getTargetClass()):
+            reg_count = 0
+            def registerUtility(self, *args):
+                self.reg_count += 1
+                super(CompThatChangesAfter1Reg, self).registerUtility(*args)
+                if self.reg_count == 1:
+                    self._utility_registrations = dict(self._utility_registrations)
+
+        comp = CompThatChangesAfter1Reg()
+        comp.registerUtility(object(), Interface)
+
+        self.assertEqual(len(list(comp.registeredUtilities())), 1)
+
+        class IFoo(Interface):
+            pass
+
+        comp.registerUtility(object(), IFoo)
+        self.assertEqual(len(list(comp.registeredUtilities())), 2)
+
+    def test_registerUtility_changes_object_identity_before(self):
+        # If a subclass changes the identity of the _utility_registrations,
+        # the cache is updated and the right thing still happens.
+        class CompThatChangesAfter2Reg(self._getTargetClass()):
+            reg_count = 0
+            def registerUtility(self, *args):
+                self.reg_count += 1
+                if self.reg_count == 2:
+                    self._utility_registrations = dict(self._utility_registrations)
+
+                super(CompThatChangesAfter2Reg, self).registerUtility(*args)
+
+        comp = CompThatChangesAfter2Reg()
+        comp.registerUtility(object(), Interface)
+
+        self.assertEqual(len(list(comp.registeredUtilities())), 1)
+
+        class IFoo(Interface):
+            pass
+
+        comp.registerUtility(object(), IFoo)
+        self.assertEqual(len(list(comp.registeredUtilities())), 2)
+
+
+        class IBar(Interface):
+            pass
+
+        comp.registerUtility(object(), IBar)
+        self.assertEqual(len(list(comp.registeredUtilities())), 3)
+
+
+    def test_unregisterUtility_neither_factory_nor_component_nor_provided(self):
+        comp = self._makeOne()
+        self.assertRaises(TypeError, comp.unregisterUtility,
+                          component=None, provided=None, factory=None)
+
+    def test_unregisterUtility_both_factory_and_component(self):
+        def _factory():
+            raise NotImplementedError()
+        _to_reg = object()
+        comp = self._makeOne()
+        self.assertRaises(TypeError, comp.unregisterUtility,
+                          component=_to_reg, factory=_factory)
+
+    def test_unregisterUtility_w_component_miss(self):
+        from zope.interface.declarations import InterfaceClass
+
+        class IFoo(InterfaceClass):
+            pass
+        ifoo = IFoo('IFoo')
+        _name = u'name'
+        _to_reg = object()
+        comp = self._makeOne()
+        _monkey, _events = self._wrapEvents()
+        with _monkey:
+            unreg = comp.unregisterUtility(_to_reg, ifoo, _name)
+        self.assertFalse(unreg)
+        self.assertFalse(_events)
+
+    def test_unregisterUtility_w_component(self):
+        from zope.interface.declarations import InterfaceClass
+        from zope.interface.interfaces import Unregistered
+        from zope.interface.registry import UtilityRegistration
+
+        class IFoo(InterfaceClass):
+            pass
+        ifoo = IFoo('IFoo')
+        _name = u'name'
+        _to_reg = object()
+        comp = self._makeOne()
+        comp.registerUtility(_to_reg, ifoo, _name)
+        _monkey, _events = self._wrapEvents()
+        with _monkey:
+            unreg = comp.unregisterUtility(_to_reg, ifoo, _name)
+        self.assertTrue(unreg)
+        self.assertFalse(comp.utilities._adapters) # all erased
+        self.assertFalse((ifoo, _name) in comp._utility_registrations)
+        self.assertFalse(comp.utilities._subscribers)
+        self.assertEqual(len(_events), 1)
+        args, kw = _events[0]
+        event, = args
+        self.assertEqual(kw, {})
+        self.assertTrue(isinstance(event, Unregistered))
+        self.assertTrue(isinstance(event.object, UtilityRegistration))
+        self.assertTrue(event.object.registry is comp)
+        self.assertTrue(event.object.provided is ifoo)
+        self.assertTrue(event.object.name is _name)
+        self.assertTrue(event.object.component is _to_reg)
+        self.assertTrue(event.object.factory is None)
+
+    def test_unregisterUtility_w_factory(self):
+        from zope.interface.declarations import InterfaceClass
+        from zope.interface.interfaces import Unregistered
+        from zope.interface.registry import UtilityRegistration
+
+        class IFoo(InterfaceClass):
+            pass
+        ifoo = IFoo('IFoo')
+        _info = u'info'
+        _name = u'name'
+        _to_reg = object()
+        def _factory():
+            return _to_reg
+        comp = self._makeOne()
+        comp.registerUtility(None, ifoo, _name, _info, factory=_factory)
+        _monkey, _events = self._wrapEvents()
+        with _monkey:
+            unreg = comp.unregisterUtility(None, ifoo, _name, factory=_factory)
+        self.assertTrue(unreg)
+        self.assertEqual(len(_events), 1)
+        args, kw = _events[0]
+        event, = args
+        self.assertEqual(kw, {})
+        self.assertTrue(isinstance(event, Unregistered))
+        self.assertTrue(isinstance(event.object, UtilityRegistration))
+        self.assertTrue(event.object.registry is comp)
+        self.assertTrue(event.object.provided is ifoo)
+        self.assertTrue(event.object.name is _name)
+        self.assertTrue(event.object.component is _to_reg)
+        self.assertTrue(event.object.factory is _factory)
+
+    def test_unregisterUtility_wo_explicit_provided(self):
+        from zope.interface.declarations import directlyProvides
+        from zope.interface.declarations import InterfaceClass
+        from zope.interface.interfaces import Unregistered
+        from zope.interface.registry import UtilityRegistration
+
+        class IFoo(InterfaceClass):
+            pass
+        class Foo(object):
+            pass
+        ifoo = IFoo('IFoo')
+        _info = u'info'
+        _name = u'name'
+        _to_reg = Foo()
+        directlyProvides(_to_reg, ifoo)
+        comp = self._makeOne()
+        comp.registerUtility(_to_reg, ifoo, _name, _info)
+        _monkey, _events = self._wrapEvents()
+        with _monkey:
+            unreg = comp.unregisterUtility(_to_reg, None, _name)
+        self.assertTrue(unreg)
+        self.assertEqual(len(_events), 1)
+        args, kw = _events[0]
+        event, = args
+        self.assertEqual(kw, {})
+        self.assertTrue(isinstance(event, Unregistered))
+        self.assertTrue(isinstance(event.object, UtilityRegistration))
+        self.assertTrue(event.object.registry is comp)
+        self.assertTrue(event.object.provided is ifoo)
+        self.assertTrue(event.object.name is _name)
+        self.assertTrue(event.object.component is _to_reg)
+        self.assertTrue(event.object.info is _info)
+        self.assertTrue(event.object.factory is None)
+
+    def test_unregisterUtility_wo_component_or_factory(self):
+        from zope.interface.declarations import directlyProvides
+        from zope.interface.declarations import InterfaceClass
+        from zope.interface.interfaces import Unregistered
+        from zope.interface.registry import UtilityRegistration
+
+        class IFoo(InterfaceClass):
+            pass
+        class Foo(object):
+            pass
+        ifoo = IFoo('IFoo')
+        _info = u'info'
+        _name = u'name'
+        _to_reg = Foo()
+        directlyProvides(_to_reg, ifoo)
+        comp = self._makeOne()
+        comp.registerUtility(_to_reg, ifoo, _name, _info)
+        _monkey, _events = self._wrapEvents()
+        with _monkey:
+            # Just pass the interface / name
+            unreg = comp.unregisterUtility(provided=ifoo, name=_name)
+        self.assertTrue(unreg)
+        self.assertEqual(len(_events), 1)
+        args, kw = _events[0]
+        event, = args
+        self.assertEqual(kw, {})
+        self.assertTrue(isinstance(event, Unregistered))
+        self.assertTrue(isinstance(event.object, UtilityRegistration))
+        self.assertTrue(event.object.registry is comp)
+        self.assertTrue(event.object.provided is ifoo)
+        self.assertTrue(event.object.name is _name)
+        self.assertTrue(event.object.component is _to_reg)
+        self.assertTrue(event.object.info is _info)
+        self.assertTrue(event.object.factory is None)
+
+    def test_unregisterUtility_w_existing_subscr(self):
+        from zope.interface.declarations import InterfaceClass
+
+        class IFoo(InterfaceClass):
+            pass
+        ifoo = IFoo('IFoo')
+        _info = u'info'
+        _name1 = u'name1'
+        _name2 = u'name2'
+        _to_reg = object()
+        comp = self._makeOne()
+        comp.registerUtility(_to_reg, ifoo, _name1, _info)
+        comp.registerUtility(_to_reg, ifoo, _name2, _info)
+        _monkey, _events = self._wrapEvents()
+        with _monkey:
+            comp.unregisterUtility(_to_reg, ifoo, _name2)
+        self.assertEqual(comp.utilities._subscribers[0][ifoo][''], (_to_reg,))
+
+    def test_unregisterUtility_w_existing_subscr_non_hashable(self):
+        from zope.interface.declarations import InterfaceClass
+
+        class IFoo(InterfaceClass):
+            pass
+        ifoo = IFoo('IFoo')
+        _info = u'info'
+        _name1 = u'name1'
+        _name2 = u'name2'
+        _to_reg = dict()
+        comp = self._makeOne()
+        comp.registerUtility(_to_reg, ifoo, _name1, _info)
+        comp.registerUtility(_to_reg, ifoo, _name2, _info)
+        _monkey, _events = self._wrapEvents()
+        with _monkey:
+            comp.unregisterUtility(_to_reg, ifoo, _name2)
+        self.assertEqual(comp.utilities._subscribers[0][ifoo][''], (_to_reg,))
+
+    def test_unregisterUtility_w_existing_subscr_non_hashable_fresh_cache(self):
+        # We correctly populate the cache of registrations if it has gone away
+        # (for example, the Components was unpickled)
+        from zope.interface.declarations import InterfaceClass
+        from zope.interface.registry import _UtilityRegistrations
+
+        class IFoo(InterfaceClass):
+            pass
+        ifoo = IFoo('IFoo')
+        _info = u'info'
+        _name1 = u'name1'
+        _name2 = u'name2'
+        _to_reg = dict()
+        comp = self._makeOne()
+        comp.registerUtility(_to_reg, ifoo, _name1, _info)
+        comp.registerUtility(_to_reg, ifoo, _name2, _info)
+
+        _monkey, _events = self._wrapEvents()
+        with _monkey:
+            comp.unregisterUtility(_to_reg, ifoo, _name2)
+        self.assertEqual(comp.utilities._subscribers[0][ifoo][''], (_to_reg,))
+
+    def test_unregisterUtility_w_existing_subscr_non_hashable_reinitted(self):
+        # We correctly populate the cache of registrations if the base objects change
+        # out from under us
+        from zope.interface.declarations import InterfaceClass
+
+        class IFoo(InterfaceClass):
+            pass
+        ifoo = IFoo('IFoo')
+        _info = u'info'
+        _name1 = u'name1'
+        _name2 = u'name2'
+        _to_reg = dict()
+        comp = self._makeOne()
+        comp.registerUtility(_to_reg, ifoo, _name1, _info)
+        comp.registerUtility(_to_reg, ifoo, _name2, _info)
+
+        # zope.component.testing does this
+        comp.__init__('base')
+
+        comp.registerUtility(_to_reg, ifoo, _name2, _info)
+
+        _monkey, _events = self._wrapEvents()
+        with _monkey:
+            # Nothing to do, but we don't break either
+            comp.unregisterUtility(_to_reg, ifoo, _name2)
+        self.assertEqual(0, len(comp.utilities._subscribers))
+
+    def test_unregisterUtility_w_existing_subscr_other_component(self):
+        from zope.interface.declarations import InterfaceClass
+
+        class IFoo(InterfaceClass):
+            pass
+        ifoo = IFoo('IFoo')
+        _info = u'info'
+        _name1 = u'name1'
+        _name2 = u'name2'
+        _other_reg = object()
+        _to_reg = object()
+        comp = self._makeOne()
+        comp.registerUtility(_other_reg, ifoo, _name1, _info)
+        comp.registerUtility(_to_reg, ifoo, _name2, _info)
+        _monkey, _events = self._wrapEvents()
+        with _monkey:
+            comp.unregisterUtility(_to_reg, ifoo, _name2)
+        self.assertEqual(comp.utilities._subscribers[0][ifoo][''],
+                         (_other_reg,))
+
+    def test_unregisterUtility_w_existing_subscr_other_component_mixed_hash(self):
+        from zope.interface.declarations import InterfaceClass
+
+        class IFoo(InterfaceClass):
+            pass
+        ifoo = IFoo('IFoo')
+        _info = u'info'
+        _name1 = u'name1'
+        _name2 = u'name2'
+        # First register something hashable
+        _other_reg = object()
+        # Then it transfers to something unhashable
+        _to_reg = dict()
+        comp = self._makeOne()
+        comp.registerUtility(_other_reg, ifoo, _name1, _info)
+        comp.registerUtility(_to_reg, ifoo, _name2, _info)
+        _monkey, _events = self._wrapEvents()
+        with _monkey:
+            comp.unregisterUtility(_to_reg, ifoo, _name2)
+        self.assertEqual(comp.utilities._subscribers[0][ifoo][''],
+                         (_other_reg,))
+
+    def test_registeredUtilities_empty(self):
+        comp = self._makeOne()
+        self.assertEqual(list(comp.registeredUtilities()), [])
+
+    def test_registeredUtilities_notempty(self):
+        from zope.interface.declarations import InterfaceClass
+
+        from zope.interface.registry import UtilityRegistration
+        class IFoo(InterfaceClass):
+            pass
+        ifoo = IFoo('IFoo')
+        _info = u'info'
+        _name1 = u'name1'
+        _name2 = u'name2'
+        _to_reg = object()
+        comp = self._makeOne()
+        comp.registerUtility(_to_reg, ifoo, _name1, _info)
+        comp.registerUtility(_to_reg, ifoo, _name2, _info)
+        reg = sorted(comp.registeredUtilities(), key=lambda r: r.name)
+        self.assertEqual(len(reg), 2)
+        self.assertTrue(isinstance(reg[0], UtilityRegistration))
+        self.assertTrue(reg[0].registry is comp)
+        self.assertTrue(reg[0].provided is ifoo)
+        self.assertTrue(reg[0].name is _name1)
+        self.assertTrue(reg[0].component is _to_reg)
+        self.assertTrue(reg[0].info is _info)
+        self.assertTrue(reg[0].factory is None)
+        self.assertTrue(isinstance(reg[1], UtilityRegistration))
+        self.assertTrue(reg[1].registry is comp)
+        self.assertTrue(reg[1].provided is ifoo)
+        self.assertTrue(reg[1].name is _name2)
+        self.assertTrue(reg[1].component is _to_reg)
+        self.assertTrue(reg[1].info is _info)
+        self.assertTrue(reg[1].factory is None)
+
+    def test_queryUtility_miss_no_default(self):
+        from zope.interface.declarations import InterfaceClass
+        class IFoo(InterfaceClass):
+            pass
+        ifoo = IFoo('IFoo')
+        comp = self._makeOne()
+        self.assertTrue(comp.queryUtility(ifoo) is None)
+
+    def test_queryUtility_miss_w_default(self):
+        from zope.interface.declarations import InterfaceClass
+        class IFoo(InterfaceClass):
+            pass
+        ifoo = IFoo('IFoo')
+        comp = self._makeOne()
+        _default = object()
+        self.assertTrue(comp.queryUtility(ifoo, default=_default) is _default)
+
+    def test_queryUtility_hit(self):
+        from zope.interface.declarations import InterfaceClass
+        class IFoo(InterfaceClass):
+            pass
+        ifoo = IFoo('IFoo')
+        _to_reg = object()
+        comp = self._makeOne()
+        comp.registerUtility(_to_reg, ifoo)
+        self.assertTrue(comp.queryUtility(ifoo) is _to_reg)
+
+    def test_getUtility_miss(self):
+        from zope.interface.declarations import InterfaceClass
+        from zope.interface.interfaces import ComponentLookupError
+        class IFoo(InterfaceClass):
+            pass
+        ifoo = IFoo('IFoo')
+        comp = self._makeOne()
+        self.assertRaises(ComponentLookupError, comp.getUtility, ifoo)
+
+    def test_getUtility_hit(self):
+        from zope.interface.declarations import InterfaceClass
+        class IFoo(InterfaceClass):
+            pass
+        ifoo = IFoo('IFoo')
+        _to_reg = object()
+        comp = self._makeOne()
+        comp.registerUtility(_to_reg, ifoo)
+        self.assertTrue(comp.getUtility(ifoo) is _to_reg)
+
+    def test_getUtilitiesFor_miss(self):
+        from zope.interface.declarations import InterfaceClass
+        class IFoo(InterfaceClass):
+            pass
+        ifoo = IFoo('IFoo')
+        comp = self._makeOne()
+        self.assertEqual(list(comp.getUtilitiesFor(ifoo)), [])
+
+    def test_getUtilitiesFor_hit(self):
+        from zope.interface.declarations import InterfaceClass
+
+        class IFoo(InterfaceClass):
+            pass
+        ifoo = IFoo('IFoo')
+        _name1 = u'name1'
+        _name2 = u'name2'
+        _to_reg = object()
+        comp = self._makeOne()
+        comp.registerUtility(_to_reg, ifoo, name=_name1)
+        comp.registerUtility(_to_reg, ifoo, name=_name2)
+        self.assertEqual(sorted(comp.getUtilitiesFor(ifoo)),
+                         [(_name1, _to_reg), (_name2, _to_reg)])
+
+    def test_getAllUtilitiesRegisteredFor_miss(self):
+        from zope.interface.declarations import InterfaceClass
+        class IFoo(InterfaceClass):
+            pass
+        ifoo = IFoo('IFoo')
+        comp = self._makeOne()
+        self.assertEqual(list(comp.getAllUtilitiesRegisteredFor(ifoo)), [])
+
+    def test_getAllUtilitiesRegisteredFor_hit(self):
+        from zope.interface.declarations import InterfaceClass
+
+        class IFoo(InterfaceClass):
+            pass
+        ifoo = IFoo('IFoo')
+        _name1 = u'name1'
+        _name2 = u'name2'
+        _to_reg = object()
+        comp = self._makeOne()
+        comp.registerUtility(_to_reg, ifoo, name=_name1)
+        comp.registerUtility(_to_reg, ifoo, name=_name2)
+        self.assertEqual(list(comp.getAllUtilitiesRegisteredFor(ifoo)),
+                         [_to_reg])
+
+    def test_registerAdapter_with_component_name(self):
+        from zope.interface.declarations import named, InterfaceClass
+
+
+        class IFoo(InterfaceClass):
+            pass
+        ifoo = IFoo('IFoo')
+        ibar = IFoo('IBar')
+
+        @named(u'foo')
+        class Foo(object):
+            pass
+        _info = u'info'
+
+        comp = self._makeOne()
+        comp.registerAdapter(Foo, (ibar,), ifoo, info=_info)
+
+        self.assertEqual(
+            comp._adapter_registrations[(ibar,), ifoo, u'foo'],
+            (Foo, _info))
+
+    def test_registerAdapter_w_explicit_provided_and_required(self):
+        from zope.interface.declarations import InterfaceClass
+        from zope.interface.interfaces import Registered
+        from zope.interface.registry import AdapterRegistration
+
+        class IFoo(InterfaceClass):
+            pass
+        ifoo = IFoo('IFoo')
+        ibar = IFoo('IBar')
+        _info = u'info'
+        _name = u'name'
+
+        def _factory(context):
+            raise NotImplementedError()
+        comp = self._makeOne()
+        _monkey, _events = self._wrapEvents()
+        with _monkey:
+            comp.registerAdapter(_factory, (ibar,), ifoo, _name, _info)
+        self.assertTrue(comp.adapters._adapters[1][ibar][ifoo][_name]
+                        is _factory)
+        self.assertEqual(comp._adapter_registrations[(ibar,), ifoo, _name],
+                         (_factory, _info))
+        self.assertEqual(len(_events), 1)
+        args, kw = _events[0]
+        event, = args
+        self.assertEqual(kw, {})
+        self.assertTrue(isinstance(event, Registered))
+        self.assertTrue(isinstance(event.object, AdapterRegistration))
+        self.assertTrue(event.object.registry is comp)
+        self.assertTrue(event.object.provided is ifoo)
+        self.assertEqual(event.object.required, (ibar,))
+        self.assertTrue(event.object.name is _name)
+        self.assertTrue(event.object.info is _info)
+        self.assertTrue(event.object.factory is _factory)
+
+    def test_registerAdapter_no_provided_available(self):
+        from zope.interface.declarations import InterfaceClass
+
+        class IFoo(InterfaceClass):
+            pass
+
+        ibar = IFoo('IBar')
+        _info = u'info'
+        _name = u'name'
+
+        class _Factory(object):
+            pass
+
+        comp = self._makeOne()
+        self.assertRaises(TypeError, comp.registerAdapter, _Factory, (ibar,),
+                          name=_name, info=_info)
+
+    def test_registerAdapter_wo_explicit_provided(self):
+        from zope.interface.declarations import InterfaceClass
+        from zope.interface.declarations import implementer
+        from zope.interface.interfaces import Registered
+        from zope.interface.registry import AdapterRegistration
+
+        class IFoo(InterfaceClass):
+            pass
+        ifoo = IFoo('IFoo')
+        ibar = IFoo('IBar')
+        _info = u'info'
+        _name = u'name'
+        _to_reg = object()
+
+        @implementer(ifoo)
+        class _Factory(object):
+            pass
+
+        comp = self._makeOne()
+        _monkey, _events = self._wrapEvents()
+        with _monkey:
+            comp.registerAdapter(_Factory, (ibar,), name=_name, info=_info)
+        self.assertTrue(comp.adapters._adapters[1][ibar][ifoo][_name]
+                        is _Factory)
+        self.assertEqual(comp._adapter_registrations[(ibar,), ifoo, _name],
+                         (_Factory, _info))
+        self.assertEqual(len(_events), 1)
+        args, kw = _events[0]
+        event, = args
+        self.assertEqual(kw, {})
+        self.assertTrue(isinstance(event, Registered))
+        self.assertTrue(isinstance(event.object, AdapterRegistration))
+        self.assertTrue(event.object.registry is comp)
+        self.assertTrue(event.object.provided is ifoo)
+        self.assertEqual(event.object.required, (ibar,))
+        self.assertTrue(event.object.name is _name)
+        self.assertTrue(event.object.info is _info)
+        self.assertTrue(event.object.factory is _Factory)
+
+    def test_registerAdapter_no_required_available(self):
+        from zope.interface.declarations import InterfaceClass
+
+        class IFoo(InterfaceClass):
+            pass
+        ifoo = IFoo('IFoo')
+
+        _info = u'info'
+        _name = u'name'
+        class _Factory(object):
+           pass
+
+        comp = self._makeOne()
+        self.assertRaises(TypeError, comp.registerAdapter, _Factory,
+                          provided=ifoo, name=_name, info=_info)
+
+    def test_registerAdapter_w_invalid_required(self):
+        from zope.interface.declarations import InterfaceClass
+
+        class IFoo(InterfaceClass):
+            pass
+        ifoo = IFoo('IFoo')
+        ibar = IFoo('IBar')
+        _info = u'info'
+        _name = u'name'
+        class _Factory(object):
+            pass
+        comp = self._makeOne()
+        self.assertRaises(TypeError, comp.registerAdapter, _Factory,
+                          ibar, provided=ifoo, name=_name, info=_info)
+
+    def test_registerAdapter_w_required_containing_None(self):
+        from zope.interface.declarations import InterfaceClass
+        from zope.interface.interface import Interface
+        from zope.interface.interfaces import Registered
+        from zope.interface.registry import AdapterRegistration
+
+        class IFoo(InterfaceClass):
+            pass
+        ifoo = IFoo('IFoo')
+        _info = u'info'
+        _name = u'name'
+        class _Factory(object):
+            pass
+        comp = self._makeOne()
+        _monkey, _events = self._wrapEvents()
+        with _monkey:
+            comp.registerAdapter(_Factory, [None], provided=ifoo,
+                                 name=_name, info=_info)
+        self.assertTrue(comp.adapters._adapters[1][Interface][ifoo][_name]
+                        is _Factory)
+        self.assertEqual(comp._adapter_registrations[(Interface,), ifoo, _name],
+                         (_Factory, _info))
+        self.assertEqual(len(_events), 1)
+        args, kw = _events[0]
+        event, = args
+        self.assertEqual(kw, {})
+        self.assertTrue(isinstance(event, Registered))
+        self.assertTrue(isinstance(event.object, AdapterRegistration))
+        self.assertTrue(event.object.registry is comp)
+        self.assertTrue(event.object.provided is ifoo)
+        self.assertEqual(event.object.required, (Interface,))
+        self.assertTrue(event.object.name is _name)
+        self.assertTrue(event.object.info is _info)
+        self.assertTrue(event.object.factory is _Factory)
+
+    def test_registerAdapter_w_required_containing_class(self):
+        from zope.interface.declarations import InterfaceClass
+        from zope.interface.declarations import implementer
+        from zope.interface.declarations import implementedBy
+        from zope.interface.interfaces import Registered
+        from zope.interface.registry import AdapterRegistration
+
+        class IFoo(InterfaceClass):
+            pass
+        ifoo = IFoo('IFoo')
+        ibar = IFoo('IBar')
+        _info = u'info'
+        _name = u'name'
+        class _Factory(object):
+            pass
+
+        @implementer(ibar)
+        class _Context(object):
+            pass
+        _ctx_impl = implementedBy(_Context)
+        comp = self._makeOne()
+        _monkey, _events = self._wrapEvents()
+        with _monkey:
+            comp.registerAdapter(_Factory, [_Context], provided=ifoo,
+                                 name=_name, info=_info)
+        self.assertTrue(comp.adapters._adapters[1][_ctx_impl][ifoo][_name]
+                        is _Factory)
+        self.assertEqual(comp._adapter_registrations[(_ctx_impl,), ifoo, _name],
+                         (_Factory, _info))
+        self.assertEqual(len(_events), 1)
+        args, kw = _events[0]
+        event, = args
+        self.assertEqual(kw, {})
+        self.assertTrue(isinstance(event, Registered))
+        self.assertTrue(isinstance(event.object, AdapterRegistration))
+        self.assertTrue(event.object.registry is comp)
+        self.assertTrue(event.object.provided is ifoo)
+        self.assertEqual(event.object.required, (_ctx_impl,))
+        self.assertTrue(event.object.name is _name)
+        self.assertTrue(event.object.info is _info)
+        self.assertTrue(event.object.factory is _Factory)
+
+    def test_registerAdapter_w_required_containing_junk(self):
+        from zope.interface.declarations import InterfaceClass
+
+        class IFoo(InterfaceClass):
+            pass
+        ifoo = IFoo('IFoo')
+
+        _info = u'info'
+        _name = u'name'
+        class _Factory(object):
+            pass
+        comp = self._makeOne()
+        self.assertRaises(TypeError, comp.registerAdapter, _Factory, [object()],
+                          provided=ifoo, name=_name, info=_info)
+
+    def test_registerAdapter_wo_explicit_required(self):
+        from zope.interface.declarations import InterfaceClass
+        from zope.interface.interfaces import Registered
+        from zope.interface.registry import AdapterRegistration
+
+        class IFoo(InterfaceClass):
+            pass
+        ifoo = IFoo('IFoo')
+        ibar = IFoo('IBar')
+        _info = u'info'
+        _name = u'name'
+        class _Factory(object):
+            __component_adapts__ = (ibar,)
+
+        comp = self._makeOne()
+        _monkey, _events = self._wrapEvents()
+        with _monkey:
+            comp.registerAdapter(_Factory, provided=ifoo, name=_name,
+                                 info=_info)
+        self.assertTrue(comp.adapters._adapters[1][ibar][ifoo][_name]
+                        is _Factory)
+        self.assertEqual(comp._adapter_registrations[(ibar,), ifoo, _name],
+                         (_Factory, _info))
+        self.assertEqual(len(_events), 1)
+        args, kw = _events[0]
+        event, = args
+        self.assertEqual(kw, {})
+        self.assertTrue(isinstance(event, Registered))
+        self.assertTrue(isinstance(event.object, AdapterRegistration))
+        self.assertTrue(event.object.registry is comp)
+        self.assertTrue(event.object.provided is ifoo)
+        self.assertEqual(event.object.required, (ibar,))
+        self.assertTrue(event.object.name is _name)
+        self.assertTrue(event.object.info is _info)
+        self.assertTrue(event.object.factory is _Factory)
+
+    def test_registerAdapter_wo_event(self):
+        from zope.interface.declarations import InterfaceClass
+
+        class IFoo(InterfaceClass):
+            pass
+        ifoo = IFoo('IFoo')
+        ibar = IFoo('IBar')
+        _info = u'info'
+        _name = u'name'
+
+        def _factory(context):
+            raise NotImplementedError()
+        comp = self._makeOne()
+        _monkey, _events = self._wrapEvents()
+        with _monkey:
+            comp.registerAdapter(_factory, (ibar,), ifoo, _name, _info,
+                                 event=False)
+        self.assertEqual(len(_events), 0)
+
+    def test_unregisterAdapter_neither_factory_nor_provided(self):
+        comp = self._makeOne()
+        self.assertRaises(TypeError, comp.unregisterAdapter,
+                          factory=None, provided=None)
+
+    def test_unregisterAdapter_neither_factory_nor_required(self):
+        from zope.interface.declarations import InterfaceClass
+        class IFoo(InterfaceClass):
+            pass
+        ifoo = IFoo('IFoo')
+        comp = self._makeOne()
+        self.assertRaises(TypeError, comp.unregisterAdapter,
+                          factory=None, provided=ifoo, required=None)
+
+    def test_unregisterAdapter_miss(self):
+        from zope.interface.declarations import InterfaceClass
+        class IFoo(InterfaceClass):
+            pass
+        ifoo = IFoo('IFoo')
+        ibar = IFoo('IBar')
+        class _Factory(object):
+            pass
+
+        comp = self._makeOne()
+        _monkey, _events = self._wrapEvents()
+        with _monkey:
+            unreg = comp.unregisterAdapter(_Factory, (ibar,), ifoo)
+        self.assertFalse(unreg)
+
+    def test_unregisterAdapter_hit_w_explicit_provided_and_required(self):
+        from zope.interface.declarations import InterfaceClass
+        from zope.interface.interfaces import Unregistered
+        from zope.interface.registry import AdapterRegistration
+        class IFoo(InterfaceClass):
+            pass
+        ifoo = IFoo('IFoo')
+        ibar = IFoo('IBar')
+        class _Factory(object):
+            pass
+
+        comp = self._makeOne()
+        comp.registerAdapter(_Factory, (ibar,), ifoo)
+        _monkey, _events = self._wrapEvents()
+        with _monkey:
+            unreg = comp.unregisterAdapter(_Factory, (ibar,), ifoo)
+        self.assertTrue(unreg)
+        self.assertFalse(comp.adapters._adapters)
+        self.assertFalse(comp._adapter_registrations)
+        self.assertEqual(len(_events), 1)
+        args, kw = _events[0]
+        event, = args
+        self.assertEqual(kw, {})
+        self.assertTrue(isinstance(event, Unregistered))
+        self.assertTrue(isinstance(event.object, AdapterRegistration))
+        self.assertTrue(event.object.registry is comp)
+        self.assertTrue(event.object.provided is ifoo)
+        self.assertEqual(event.object.required, (ibar,))
+        self.assertEqual(event.object.name, '')
+        self.assertEqual(event.object.info, '')
+        self.assertTrue(event.object.factory is _Factory)
+
+    def test_unregisterAdapter_wo_explicit_provided(self):
+        from zope.interface.declarations import InterfaceClass
+        from zope.interface.declarations import implementer
+        from zope.interface.interfaces import Unregistered
+        from zope.interface.registry import AdapterRegistration
+        class IFoo(InterfaceClass):
+            pass
+        ifoo = IFoo('IFoo')
+        ibar = IFoo('IBar')
+        @implementer(ifoo)
+        class _Factory(object):
+            pass
+
+        comp = self._makeOne()
+        comp.registerAdapter(_Factory, (ibar,), ifoo)
+        _monkey, _events = self._wrapEvents()
+        with _monkey:
+            unreg = comp.unregisterAdapter(_Factory, (ibar,))
+        self.assertTrue(unreg)
+        self.assertEqual(len(_events), 1)
+        args, kw = _events[0]
+        event, = args
+        self.assertEqual(kw, {})
+        self.assertTrue(isinstance(event, Unregistered))
+        self.assertTrue(isinstance(event.object, AdapterRegistration))
+        self.assertTrue(event.object.registry is comp)
+        self.assertTrue(event.object.provided is ifoo)
+        self.assertEqual(event.object.required, (ibar,))
+        self.assertEqual(event.object.name, '')
+        self.assertEqual(event.object.info, '')
+        self.assertTrue(event.object.factory is _Factory)
+
+    def test_unregisterAdapter_wo_explicit_required(self):
+        from zope.interface.declarations import InterfaceClass
+        from zope.interface.interfaces import Unregistered
+        from zope.interface.registry import AdapterRegistration
+        class IFoo(InterfaceClass):
+            pass
+        ifoo = IFoo('IFoo')
+        ibar = IFoo('IBar')
+        class _Factory(object):
+            __component_adapts__ = (ibar,)
+
+        comp = self._makeOne()
+        comp.registerAdapter(_Factory, (ibar,), ifoo)
+        _monkey, _events = self._wrapEvents()
+        with _monkey:
+            unreg = comp.unregisterAdapter(_Factory, provided=ifoo)
+        self.assertTrue(unreg)
+        self.assertEqual(len(_events), 1)
+        args, kw = _events[0]
+        event, = args
+        self.assertEqual(kw, {})
+        self.assertTrue(isinstance(event, Unregistered))
+        self.assertTrue(isinstance(event.object, AdapterRegistration))
+        self.assertTrue(event.object.registry is comp)
+        self.assertTrue(event.object.provided is ifoo)
+        self.assertEqual(event.object.required, (ibar,))
+        self.assertEqual(event.object.name, '')
+        self.assertEqual(event.object.info, '')
+        self.assertTrue(event.object.factory is _Factory)
+
+    def test_registeredAdapters_empty(self):
+        comp = self._makeOne()
+        self.assertEqual(list(comp.registeredAdapters()), [])
+
+    def test_registeredAdapters_notempty(self):
+        from zope.interface.declarations import InterfaceClass
+
+        from zope.interface.registry import AdapterRegistration
+        class IFoo(InterfaceClass):
+            pass
+        ifoo = IFoo('IFoo')
+        ibar = IFoo('IFoo')
+        _info = u'info'
+        _name1 = u'name1'
+        _name2 = u'name2'
+        class _Factory(object):
+            pass
+
+        comp = self._makeOne()
+        comp.registerAdapter(_Factory, (ibar,), ifoo, _name1, _info)
+        comp.registerAdapter(_Factory, (ibar,), ifoo, _name2, _info)
+        reg = sorted(comp.registeredAdapters(), key=lambda r: r.name)
+        self.assertEqual(len(reg), 2)
+        self.assertTrue(isinstance(reg[0], AdapterRegistration))
+        self.assertTrue(reg[0].registry is comp)
+        self.assertTrue(reg[0].provided is ifoo)
+        self.assertEqual(reg[0].required, (ibar,))
+        self.assertTrue(reg[0].name is _name1)
+        self.assertTrue(reg[0].info is _info)
+        self.assertTrue(reg[0].factory is _Factory)
+        self.assertTrue(isinstance(reg[1], AdapterRegistration))
+        self.assertTrue(reg[1].registry is comp)
+        self.assertTrue(reg[1].provided is ifoo)
+        self.assertEqual(reg[1].required, (ibar,))
+        self.assertTrue(reg[1].name is _name2)
+        self.assertTrue(reg[1].info is _info)
+        self.assertTrue(reg[1].factory is _Factory)
+
+    def test_queryAdapter_miss_no_default(self):
+        from zope.interface.declarations import InterfaceClass
+        class IFoo(InterfaceClass):
+            pass
+        ifoo = IFoo('IFoo')
+        comp = self._makeOne()
+        _context = object()
+        self.assertTrue(comp.queryAdapter(_context, ifoo) is None)
+
+    def test_queryAdapter_miss_w_default(self):
+        from zope.interface.declarations import InterfaceClass
+        class IFoo(InterfaceClass):
+            pass
+        ifoo = IFoo('IFoo')
+        comp = self._makeOne()
+        _context = object()
+        _default = object()
+        self.assertTrue(
+            comp.queryAdapter(_context, ifoo, default=_default) is _default)
+
+    def test_queryAdapter_hit(self):
+        from zope.interface.declarations import InterfaceClass
+        from zope.interface.declarations import implementer
+        class IFoo(InterfaceClass):
+            pass
+        ifoo = IFoo('IFoo')
+        ibar = IFoo('IBar')
+        class _Factory(object):
+            def __init__(self, context):
+                self.context = context
+        @implementer(ibar)
+        class _Context(object):
+            pass
+        _context = _Context()
+        comp = self._makeOne()
+        comp.registerAdapter(_Factory, (ibar,), ifoo)
+        adapter = comp.queryAdapter(_context, ifoo)
+        self.assertTrue(isinstance(adapter, _Factory))
+        self.assertTrue(adapter.context is _context)
+
+    def test_getAdapter_miss(self):
+        from zope.interface.declarations import InterfaceClass
+        from zope.interface.declarations import implementer
+        from zope.interface.interfaces import ComponentLookupError
+        class IFoo(InterfaceClass):
+            pass
+        ifoo = IFoo('IFoo')
+        ibar = IFoo('IBar')
+        @implementer(ibar)
+        class _Context(object):
+            pass
+        _context = _Context()
+        comp = self._makeOne()
+        self.assertRaises(ComponentLookupError,
+                          comp.getAdapter, _context, ifoo)
+
+    def test_getAdapter_hit(self):
+        from zope.interface.declarations import InterfaceClass
+        from zope.interface.declarations import implementer
+        class IFoo(InterfaceClass):
+            pass
+        ifoo = IFoo('IFoo')
+        ibar = IFoo('IBar')
+        class _Factory(object):
+            def __init__(self, context):
+                self.context = context
+        @implementer(ibar)
+        class _Context(object):
+            pass
+        _context = _Context()
+        comp = self._makeOne()
+        comp.registerAdapter(_Factory, (ibar,), ifoo)
+        adapter = comp.getAdapter(_context, ifoo)
+        self.assertIsInstance(adapter, _Factory)
+        self.assertIs(adapter.context, _context)
+
+    def test_getAdapter_hit_super(self):
+        from zope.interface import Interface
+        from zope.interface.declarations import implementer
+
+        class IBase(Interface):
+            pass
+
+        class IDerived(IBase):
+            pass
+
+        class IFoo(Interface):
+            pass
+
+        @implementer(IBase)
+        class Base(object):
+            pass
+
+        @implementer(IDerived)
+        class Derived(Base):
+            pass
+
+        class AdapterBase(object):
+            def __init__(self, context):
+                self.context = context
+
+        class AdapterDerived(object):
+            def __init__(self, context):
+                self.context = context
+
+        comp = self._makeOne()
+        comp.registerAdapter(AdapterDerived, (IDerived,), IFoo)
+        comp.registerAdapter(AdapterBase, (IBase,), IFoo)
+        self._should_not_change(comp)
+
+        derived = Derived()
+        adapter = comp.getAdapter(derived, IFoo)
+        self.assertIsInstance(adapter, AdapterDerived)
+        self.assertIs(adapter.context, derived)
+
+        supe = super(Derived, derived)
+        adapter = comp.getAdapter(supe, IFoo)
+        self.assertIsInstance(adapter, AdapterBase)
+        self.assertIs(adapter.context, derived)
+
+    def test_getAdapter_hit_super_when_parent_implements_interface_diamond(self):
+        from zope.interface import Interface
+        from zope.interface.declarations import implementer
+
+        class IBase(Interface):
+            pass
+
+        class IDerived(IBase):
+            pass
+
+        class IFoo(Interface):
+            pass
+
+        class Base(object):
+            pass
+
+        class Child1(Base):
+            pass
+
+        @implementer(IBase)
+        class Child2(Base):
+            pass
+
+        @implementer(IDerived)
+        class Derived(Child1, Child2):
+            pass
+
+        class AdapterBase(object):
+            def __init__(self, context):
+                self.context = context
+
+        class AdapterDerived(object):
+            def __init__(self, context):
+                self.context = context
+
+        comp = self._makeOne()
+        comp.registerAdapter(AdapterDerived, (IDerived,), IFoo)
+        comp.registerAdapter(AdapterBase, (IBase,), IFoo)
+        self._should_not_change(comp)
+
+        derived = Derived()
+        adapter = comp.getAdapter(derived, IFoo)
+        self.assertIsInstance(adapter, AdapterDerived)
+        self.assertIs(adapter.context, derived)
+
+        supe = super(Derived, derived)
+        adapter = comp.getAdapter(supe, IFoo)
+        self.assertIsInstance(adapter, AdapterBase)
+        self.assertIs(adapter.context, derived)
+
+    def test_queryMultiAdapter_miss(self):
+        from zope.interface.declarations import InterfaceClass
+        from zope.interface.declarations import implementer
+        class IFoo(InterfaceClass):
+            pass
+        ifoo = IFoo('IFoo')
+        ibar = IFoo('IBar')
+        ibaz = IFoo('IBaz')
+        @implementer(ibar)
+        class _Context1(object):
+            pass
+        @implementer(ibaz)
+        class _Context2(object):
+            pass
+        _context1 = _Context1()
+        _context2 = _Context2()
+        comp = self._makeOne()
+        self.assertEqual(comp.queryMultiAdapter((_context1, _context2), ifoo),
+                         None)
+
+    def test_queryMultiAdapter_miss_w_default(self):
+        from zope.interface.declarations import InterfaceClass
+        from zope.interface.declarations import implementer
+        class IFoo(InterfaceClass):
+            pass
+        ifoo = IFoo('IFoo')
+        ibar = IFoo('IBar')
+        ibaz = IFoo('IBaz')
+        @implementer(ibar)
+        class _Context1(object):
+            pass
+        @implementer(ibaz)
+        class _Context2(object):
+            pass
+        _context1 = _Context1()
+        _context2 = _Context2()
+        _default = object()
+        comp = self._makeOne()
+        self.assertTrue(
+            comp.queryMultiAdapter((_context1, _context2), ifoo,
+                                   default=_default) is _default)
+
+    def test_queryMultiAdapter_hit(self):
+        from zope.interface.declarations import InterfaceClass
+        from zope.interface.declarations import implementer
+        class IFoo(InterfaceClass):
+            pass
+        ifoo = IFoo('IFoo')
+        ibar = IFoo('IBar')
+        ibaz = IFoo('IBaz')
+        @implementer(ibar)
+        class _Context1(object):
+            pass
+        @implementer(ibaz)
+        class _Context2(object):
+            pass
+        _context1 = _Context1()
+        _context2 = _Context2()
+        class _Factory(object):
+            def __init__(self, context1, context2):
+                self.context = context1, context2
+        comp = self._makeOne()
+        comp.registerAdapter(_Factory, (ibar, ibaz), ifoo)
+        adapter = comp.queryMultiAdapter((_context1, _context2), ifoo)
+        self.assertTrue(isinstance(adapter, _Factory))
+        self.assertEqual(adapter.context, (_context1, _context2))
+
+    def test_getMultiAdapter_miss(self):
+        from zope.interface.declarations import InterfaceClass
+        from zope.interface.declarations import implementer
+        from zope.interface.interfaces import ComponentLookupError
+        class IFoo(InterfaceClass):
+            pass
+        ifoo = IFoo('IFoo')
+        ibar = IFoo('IBar')
+        ibaz = IFoo('IBaz')
+        @implementer(ibar)
+        class _Context1(object):
+            pass
+        @implementer(ibaz)
+        class _Context2(object):
+            pass
+        _context1 = _Context1()
+        _context2 = _Context2()
+        comp = self._makeOne()
+        self.assertRaises(ComponentLookupError,
+                          comp.getMultiAdapter, (_context1, _context2), ifoo)
+
+    def test_getMultiAdapter_hit(self):
+        from zope.interface.declarations import InterfaceClass
+        from zope.interface.declarations import implementer
+        class IFoo(InterfaceClass):
+            pass
+        ifoo = IFoo('IFoo')
+        ibar = IFoo('IBar')
+        ibaz = IFoo('IBaz')
+        @implementer(ibar)
+        class _Context1(object):
+            pass
+        @implementer(ibaz)
+        class _Context2(object):
+            pass
+        _context1 = _Context1()
+        _context2 = _Context2()
+        class _Factory(object):
+            def __init__(self, context1, context2):
+                self.context = context1, context2
+        comp = self._makeOne()
+        comp.registerAdapter(_Factory, (ibar, ibaz), ifoo)
+        adapter = comp.getMultiAdapter((_context1, _context2), ifoo)
+        self.assertTrue(isinstance(adapter, _Factory))
+        self.assertEqual(adapter.context, (_context1, _context2))
+
+    def _should_not_change(self, comp):
+        # Be sure that none of the underlying structures
+        # get told that they have changed during this process
+        # because that invalidates caches.
+        def no_changes(*args):
+            self.fail("Nothing should get changed")
+        comp.changed = no_changes
+        comp.adapters.changed = no_changes
+        comp.adapters._v_lookup.changed = no_changes
+
+    def test_getMultiAdapter_hit_super(self):
+        from zope.interface import Interface
+        from zope.interface.declarations import implementer
+
+        class IBase(Interface):
+            pass
+
+        class IDerived(IBase):
+            pass
+
+        class IFoo(Interface):
+            pass
+
+        @implementer(IBase)
+        class Base(object):
+            pass
+
+        @implementer(IDerived)
+        class Derived(Base):
+            pass
+
+        class AdapterBase(object):
+            def __init__(self, context1, context2):
+                self.context1 = context1
+                self.context2 = context2
+
+        class AdapterDerived(AdapterBase):
+            pass
+
+        comp = self._makeOne()
+        comp.registerAdapter(AdapterDerived, (IDerived, IDerived), IFoo)
+        comp.registerAdapter(AdapterBase, (IBase, IDerived), IFoo)
+        self._should_not_change(comp)
+
+        derived = Derived()
+        adapter = comp.getMultiAdapter((derived, derived), IFoo)
+        self.assertIsInstance(adapter, AdapterDerived)
+        self.assertIs(adapter.context1, derived)
+        self.assertIs(adapter.context2, derived)
+
+        supe = super(Derived, derived)
+        adapter = comp.getMultiAdapter((supe, derived), IFoo)
+        self.assertIsInstance(adapter, AdapterBase)
+        self.assertNotIsInstance(adapter, AdapterDerived)
+        self.assertIs(adapter.context1, derived)
+        self.assertIs(adapter.context2, derived)
+
+    def test_getAdapters_empty(self):
+        from zope.interface.declarations import InterfaceClass
+        from zope.interface.declarations import implementer
+        class IFoo(InterfaceClass):
+            pass
+        ifoo = IFoo('IFoo')
+        ibar = IFoo('IBar')
+        ibaz = IFoo('IBaz')
+        @implementer(ibar)
+        class _Context1(object):
+            pass
+        @implementer(ibaz)
+        class _Context2(object):
+            pass
+        _context1 = _Context1()
+        _context2 = _Context2()
+        comp = self._makeOne()
+        self.assertEqual(
+            list(comp.getAdapters((_context1, _context2), ifoo)), [])
+
+    def test_getAdapters_factory_returns_None(self):
+        from zope.interface.declarations import InterfaceClass
+        from zope.interface.declarations import implementer
+        class IFoo(InterfaceClass):
+            pass
+        ifoo = IFoo('IFoo')
+        ibar = IFoo('IBar')
+        ibaz = IFoo('IBaz')
+        @implementer(ibar)
+        class _Context1(object):
+            pass
+        @implementer(ibaz)
+        class _Context2(object):
+            pass
+        _context1 = _Context1()
+        _context2 = _Context2()
+        comp = self._makeOne()
+        _called_with = []
+        def _side_effect_only(context1, context2):
+            _called_with.append((context1, context2))
+            return None
+        comp.registerAdapter(_side_effect_only, (ibar, ibaz), ifoo)
+        self.assertEqual(
+            list(comp.getAdapters((_context1, _context2), ifoo)), [])
+        self.assertEqual(_called_with, [(_context1, _context2)])
+
+    def test_getAdapters_non_empty(self):
+        from zope.interface.declarations import InterfaceClass
+        from zope.interface.declarations import implementer
+
+        class IFoo(InterfaceClass):
+            pass
+        ifoo = IFoo('IFoo')
+        ibar = IFoo('IBar')
+        ibaz = IFoo('IBaz')
+        @implementer(ibar)
+        class _Context1(object):
+            pass
+        @implementer(ibaz)
+        class _Context2(object):
+            pass
+        _context1 = _Context1()
+        _context2 = _Context2()
+        class _Factory1(object):
+            def __init__(self, context1, context2):
+                self.context = context1, context2
+        class _Factory2(object):
+            def __init__(self, context1, context2):
+                self.context = context1, context2
+        _name1 = u'name1'
+        _name2 = u'name2'
+        comp = self._makeOne()
+        comp.registerAdapter(_Factory1, (ibar, ibaz), ifoo, name=_name1)
+        comp.registerAdapter(_Factory2, (ibar, ibaz), ifoo, name=_name2)
+        found = sorted(comp.getAdapters((_context1, _context2), ifoo))
+        self.assertEqual(len(found), 2)
+        self.assertEqual(found[0][0], _name1)
+        self.assertTrue(isinstance(found[0][1], _Factory1))
+        self.assertEqual(found[1][0], _name2)
+        self.assertTrue(isinstance(found[1][1], _Factory2))
+
+    def test_registerSubscriptionAdapter_w_nonblank_name(self):
+        from zope.interface.declarations import InterfaceClass
+
+        class IFoo(InterfaceClass):
+            pass
+        ifoo = IFoo('IFoo')
+        ibar = IFoo('IBar')
+        _name = u'name'
+        _info = u'info'
+        def _factory(context):
+            raise NotImplementedError()
+
+        comp = self._makeOne()
+        self.assertRaises(TypeError, comp.registerSubscriptionAdapter,
+                          _factory, (ibar,), ifoo, _name, _info)
+
+    def test_registerSubscriptionAdapter_w_explicit_provided_and_required(self):
+        from zope.interface.declarations import InterfaceClass
+        from zope.interface.interfaces import Registered
+        from zope.interface.registry import SubscriptionRegistration
+
+        class IFoo(InterfaceClass):
+            pass
+        ifoo = IFoo('IFoo')
+        ibar = IFoo('IBar')
+        _blank = u''
+        _info = u'info'
+        def _factory(context):
+            raise NotImplementedError()
+        comp = self._makeOne()
+        _monkey, _events = self._wrapEvents()
+        with _monkey:
+            comp.registerSubscriptionAdapter(_factory, (ibar,), ifoo,
+                                             info=_info)
+        reg = comp.adapters._subscribers[1][ibar][ifoo][_blank]
+        self.assertEqual(len(reg), 1)
+        self.assertTrue(reg[0] is _factory)
+        self.assertEqual(comp._subscription_registrations,
+                         [((ibar,), ifoo, _blank, _factory, _info)])
+        self.assertEqual(len(_events), 1)
+        args, kw = _events[0]
+        event, = args
+        self.assertEqual(kw, {})
+        self.assertTrue(isinstance(event, Registered))
+        self.assertTrue(isinstance(event.object, SubscriptionRegistration))
+        self.assertTrue(event.object.registry is comp)
+        self.assertTrue(event.object.provided is ifoo)
+        self.assertEqual(event.object.required, (ibar,))
+        self.assertEqual(event.object.name, _blank)
+        self.assertTrue(event.object.info is _info)
+        self.assertTrue(event.object.factory is _factory)
+
+    def test_registerSubscriptionAdapter_wo_explicit_provided(self):
+        from zope.interface.declarations import InterfaceClass
+        from zope.interface.declarations import implementer
+        from zope.interface.interfaces import Registered
+        from zope.interface.registry import SubscriptionRegistration
+
+        class IFoo(InterfaceClass):
+            pass
+        ifoo = IFoo('IFoo')
+        ibar = IFoo('IBar')
+        _info = u'info'
+        _blank = u''
+
+        @implementer(ifoo)
+        class _Factory(object):
+            pass
+
+        comp = self._makeOne()
+        _monkey, _events = self._wrapEvents()
+        with _monkey:
+            comp.registerSubscriptionAdapter(_Factory, (ibar,), info=_info)
+        reg = comp.adapters._subscribers[1][ibar][ifoo][_blank]
+        self.assertEqual(len(reg), 1)
+        self.assertTrue(reg[0] is _Factory)
+        self.assertEqual(comp._subscription_registrations,
+                         [((ibar,), ifoo, _blank, _Factory, _info)])
+        self.assertEqual(len(_events), 1)
+        args, kw = _events[0]
+        event, = args
+        self.assertEqual(kw, {})
+        self.assertTrue(isinstance(event, Registered))
+        self.assertTrue(isinstance(event.object, SubscriptionRegistration))
+        self.assertTrue(event.object.registry is comp)
+        self.assertTrue(event.object.provided is ifoo)
+        self.assertEqual(event.object.required, (ibar,))
+        self.assertEqual(event.object.name, _blank)
+        self.assertTrue(event.object.info is _info)
+        self.assertTrue(event.object.factory is _Factory)
+
+    def test_registerSubscriptionAdapter_wo_explicit_required(self):
+        from zope.interface.declarations import InterfaceClass
+        from zope.interface.interfaces import Registered
+        from zope.interface.registry import SubscriptionRegistration
+
+        class IFoo(InterfaceClass):
+            pass
+        ifoo = IFoo('IFoo')
+        ibar = IFoo('IBar')
+        _info = u'info'
+        _blank = u''
+        class _Factory(object):
+            __component_adapts__ = (ibar,)
+
+        comp = self._makeOne()
+        _monkey, _events = self._wrapEvents()
+        with _monkey:
+            comp.registerSubscriptionAdapter(
+                    _Factory, provided=ifoo, info=_info)
+        reg = comp.adapters._subscribers[1][ibar][ifoo][_blank]
+        self.assertEqual(len(reg), 1)
+        self.assertTrue(reg[0] is _Factory)
+        self.assertEqual(comp._subscription_registrations,
+                         [((ibar,), ifoo, _blank, _Factory, _info)])
+        self.assertEqual(len(_events), 1)
+        args, kw = _events[0]
+        event, = args
+        self.assertEqual(kw, {})
+        self.assertTrue(isinstance(event, Registered))
+        self.assertTrue(isinstance(event.object, SubscriptionRegistration))
+        self.assertTrue(event.object.registry is comp)
+        self.assertTrue(event.object.provided is ifoo)
+        self.assertEqual(event.object.required, (ibar,))
+        self.assertEqual(event.object.name, _blank)
+        self.assertTrue(event.object.info is _info)
+        self.assertTrue(event.object.factory is _Factory)
+
+    def test_registerSubscriptionAdapter_wo_event(self):
+        from zope.interface.declarations import InterfaceClass
+
+        class IFoo(InterfaceClass):
+            pass
+        ifoo = IFoo('IFoo')
+        ibar = IFoo('IBar')
+        _blank = u''
+        _info = u'info'
+
+        def _factory(context):
+            raise NotImplementedError()
+
+        comp = self._makeOne()
+        _monkey, _events = self._wrapEvents()
+        with _monkey:
+            comp.registerSubscriptionAdapter(_factory, (ibar,), ifoo,
+                                             info=_info, event=False)
+        self.assertEqual(len(_events), 0)
+
+    def test_registeredSubscriptionAdapters_empty(self):
+        comp = self._makeOne()
+        self.assertEqual(list(comp.registeredSubscriptionAdapters()), [])
+
+    def test_registeredSubscriptionAdapters_notempty(self):
+        from zope.interface.declarations import InterfaceClass
+
+        from zope.interface.registry import SubscriptionRegistration
+        class IFoo(InterfaceClass):
+            pass
+        ifoo = IFoo('IFoo')
+        ibar = IFoo('IFoo')
+        _info = u'info'
+        _blank = u''
+        class _Factory(object):
+            pass
+
+        comp = self._makeOne()
+        comp.registerSubscriptionAdapter(_Factory, (ibar,), ifoo, info=_info)
+        comp.registerSubscriptionAdapter(_Factory, (ibar,), ifoo, info=_info)
+        reg = list(comp.registeredSubscriptionAdapters())
+        self.assertEqual(len(reg), 2)
+        self.assertTrue(isinstance(reg[0], SubscriptionRegistration))
+        self.assertTrue(reg[0].registry is comp)
+        self.assertTrue(reg[0].provided is ifoo)
+        self.assertEqual(reg[0].required, (ibar,))
+        self.assertEqual(reg[0].name, _blank)
+        self.assertTrue(reg[0].info is _info)
+        self.assertTrue(reg[0].factory is _Factory)
+        self.assertTrue(isinstance(reg[1], SubscriptionRegistration))
+        self.assertTrue(reg[1].registry is comp)
+        self.assertTrue(reg[1].provided is ifoo)
+        self.assertEqual(reg[1].required, (ibar,))
+        self.assertEqual(reg[1].name, _blank)
+        self.assertTrue(reg[1].info is _info)
+        self.assertTrue(reg[1].factory is _Factory)
+
+    def test_unregisterSubscriptionAdapter_w_nonblank_name(self):
+        from zope.interface.declarations import InterfaceClass
+
+        class IFoo(InterfaceClass):
+            pass
+        ifoo = IFoo('IFoo')
+        ibar = IFoo('IBar')
+        _nonblank = u'nonblank'
+        comp = self._makeOne()
+        self.assertRaises(TypeError, comp.unregisterSubscriptionAdapter,
+                          required=ifoo, provided=ibar, name=_nonblank)
+
+    def test_unregisterSubscriptionAdapter_neither_factory_nor_provided(self):
+        comp = self._makeOne()
+        self.assertRaises(TypeError, comp.unregisterSubscriptionAdapter,
+                          factory=None, provided=None)
+
+    def test_unregisterSubscriptionAdapter_neither_factory_nor_required(self):
+        from zope.interface.declarations import InterfaceClass
+        class IFoo(InterfaceClass):
+            pass
+        ifoo = IFoo('IFoo')
+        comp = self._makeOne()
+        self.assertRaises(TypeError, comp.unregisterSubscriptionAdapter,
+                          factory=None, provided=ifoo, required=None)
+
+    def test_unregisterSubscriptionAdapter_miss(self):
+        from zope.interface.declarations import InterfaceClass
+        class IFoo(InterfaceClass):
+            pass
+        ifoo = IFoo('IFoo')
+        ibar = IFoo('IBar')
+        class _Factory(object):
+            pass
+
+        comp = self._makeOne()
+        _monkey, _events = self._wrapEvents()
+        with _monkey:
+            unreg = comp.unregisterSubscriptionAdapter(_Factory, (ibar,), ifoo)
+        self.assertFalse(unreg)
+        self.assertFalse(_events)
+
+    def test_unregisterSubscriptionAdapter_hit_wo_factory(self):
+        from zope.interface.declarations import InterfaceClass
+        from zope.interface.interfaces import Unregistered
+        from zope.interface.registry import SubscriptionRegistration
+        class IFoo(InterfaceClass):
+            pass
+        ifoo = IFoo('IFoo')
+        ibar = IFoo('IBar')
+        class _Factory(object):
+            pass
+
+        comp = self._makeOne()
+        comp.registerSubscriptionAdapter(_Factory, (ibar,), ifoo)
+        _monkey, _events = self._wrapEvents()
+        with _monkey:
+            unreg = comp.unregisterSubscriptionAdapter(None, (ibar,), ifoo)
+        self.assertTrue(unreg)
+        self.assertFalse(comp.adapters._subscribers)
+        self.assertFalse(comp._subscription_registrations)
+        self.assertEqual(len(_events), 1)
+        args, kw = _events[0]
+        event, = args
+        self.assertEqual(kw, {})
+        self.assertTrue(isinstance(event, Unregistered))
+        self.assertTrue(isinstance(event.object, SubscriptionRegistration))
+        self.assertTrue(event.object.registry is comp)
+        self.assertTrue(event.object.provided is ifoo)
+        self.assertEqual(event.object.required, (ibar,))
+        self.assertEqual(event.object.name, '')
+        self.assertEqual(event.object.info, '')
+        self.assertTrue(event.object.factory is None)
+
+    def test_unregisterSubscriptionAdapter_hit_w_factory(self):
+        from zope.interface.declarations import InterfaceClass
+        from zope.interface.interfaces import Unregistered
+        from zope.interface.registry import SubscriptionRegistration
+        class IFoo(InterfaceClass):
+            pass
+        ifoo = IFoo('IFoo')
+        ibar = IFoo('IBar')
+        class _Factory(object):
+            pass
+
+        comp = self._makeOne()
+        comp.registerSubscriptionAdapter(_Factory, (ibar,), ifoo)
+        _monkey, _events = self._wrapEvents()
+        with _monkey:
+            unreg = comp.unregisterSubscriptionAdapter(_Factory, (ibar,), ifoo)
+        self.assertTrue(unreg)
+        self.assertFalse(comp.adapters._subscribers)
+        self.assertFalse(comp._subscription_registrations)
+        self.assertEqual(len(_events), 1)
+        args, kw = _events[0]
+        event, = args
+        self.assertEqual(kw, {})
+        self.assertTrue(isinstance(event, Unregistered))
+        self.assertTrue(isinstance(event.object, SubscriptionRegistration))
+        self.assertTrue(event.object.registry is comp)
+        self.assertTrue(event.object.provided is ifoo)
+        self.assertEqual(event.object.required, (ibar,))
+        self.assertEqual(event.object.name, '')
+        self.assertEqual(event.object.info, '')
+        self.assertTrue(event.object.factory is _Factory)
+
+    def test_unregisterSubscriptionAdapter_wo_explicit_provided(self):
+        from zope.interface.declarations import InterfaceClass
+        from zope.interface.declarations import implementer
+        from zope.interface.interfaces import Unregistered
+        from zope.interface.registry import SubscriptionRegistration
+        class IFoo(InterfaceClass):
+            pass
+        ifoo = IFoo('IFoo')
+        ibar = IFoo('IBar')
+        @implementer(ifoo)
+        class _Factory(object):
+            pass
+
+        comp = self._makeOne()
+        comp.registerSubscriptionAdapter(_Factory, (ibar,), ifoo)
+        _monkey, _events = self._wrapEvents()
+        with _monkey:
+            unreg = comp.unregisterSubscriptionAdapter(_Factory, (ibar,))
+        self.assertTrue(unreg)
+        self.assertEqual(len(_events), 1)
+        args, kw = _events[0]
+        event, = args
+        self.assertEqual(kw, {})
+        self.assertTrue(isinstance(event, Unregistered))
+        self.assertTrue(isinstance(event.object, SubscriptionRegistration))
+        self.assertTrue(event.object.registry is comp)
+        self.assertTrue(event.object.provided is ifoo)
+        self.assertEqual(event.object.required, (ibar,))
+        self.assertEqual(event.object.name, '')
+        self.assertEqual(event.object.info, '')
+        self.assertTrue(event.object.factory is _Factory)
+
+    def test_unregisterSubscriptionAdapter_wo_explicit_required(self):
+        from zope.interface.declarations import InterfaceClass
+        from zope.interface.interfaces import Unregistered
+        from zope.interface.registry import SubscriptionRegistration
+        class IFoo(InterfaceClass):
+            pass
+        ifoo = IFoo('IFoo')
+        ibar = IFoo('IBar')
+        class _Factory(object):
+            __component_adapts__ = (ibar,)
+
+        comp = self._makeOne()
+        comp.registerSubscriptionAdapter(_Factory, (ibar,), ifoo)
+        _monkey, _events = self._wrapEvents()
+        with _monkey:
+            unreg = comp.unregisterSubscriptionAdapter(_Factory, provided=ifoo)
+        self.assertTrue(unreg)
+        self.assertEqual(len(_events), 1)
+        args, kw = _events[0]
+        event, = args
+        self.assertEqual(kw, {})
+        self.assertTrue(isinstance(event, Unregistered))
+        self.assertTrue(isinstance(event.object, SubscriptionRegistration))
+        self.assertTrue(event.object.registry is comp)
+        self.assertTrue(event.object.provided is ifoo)
+        self.assertEqual(event.object.required, (ibar,))
+        self.assertEqual(event.object.name, '')
+        self.assertEqual(event.object.info, '')
+        self.assertTrue(event.object.factory is _Factory)
+
+    def test_subscribers_empty(self):
+        from zope.interface.declarations import InterfaceClass
+        from zope.interface.declarations import implementer
+        class IFoo(InterfaceClass):
+            pass
+        ifoo = IFoo('IFoo')
+        ibar = IFoo('IBar')
+        comp = self._makeOne()
+        @implementer(ibar)
+        class Bar(object):
+            pass
+        bar = Bar()
+        self.assertEqual(list(comp.subscribers((bar,), ifoo)), [])
+
+    def test_subscribers_non_empty(self):
+        from zope.interface.declarations import InterfaceClass
+        from zope.interface.declarations import implementer
+        class IFoo(InterfaceClass):
+            pass
+        ifoo = IFoo('IFoo')
+        ibar = IFoo('IBar')
+        class _Factory(object):
+            __component_adapts__ = (ibar,)
+            def __init__(self, context):
+                self._context = context
+        class _Derived(_Factory):
+            pass
+        comp = self._makeOne()
+        comp.registerSubscriptionAdapter(_Factory, (ibar,), ifoo)
+        comp.registerSubscriptionAdapter(_Derived, (ibar,), ifoo)
+        @implementer(ibar)
+        class Bar(object):
+            pass
+        bar = Bar()
+        subscribers = comp.subscribers((bar,), ifoo)
+        def _klassname(x):
+            return x.__class__.__name__
+        subscribers = sorted(subscribers, key=_klassname)
+        self.assertEqual(len(subscribers), 2)
+        self.assertTrue(isinstance(subscribers[0], _Derived))
+        self.assertTrue(isinstance(subscribers[1], _Factory))
+
+    def test_registerHandler_w_nonblank_name(self):
+        from zope.interface.declarations import InterfaceClass
+
+        class IFoo(InterfaceClass):
+            pass
+        ifoo = IFoo('IFoo')
+        _nonblank = u'nonblank'
+        comp = self._makeOne()
+        def _factory(context):
+            raise NotImplementedError()
+
+        self.assertRaises(TypeError, comp.registerHandler, _factory,
+                          required=ifoo, name=_nonblank)
+
+    def test_registerHandler_w_explicit_required(self):
+        from zope.interface.declarations import InterfaceClass
+        from zope.interface.interfaces import Registered
+        from zope.interface.registry import HandlerRegistration
+
+        class IFoo(InterfaceClass):
+            pass
+        ifoo = IFoo('IFoo')
+        _blank = u''
+        _info = u'info'
+        def _factory(context):
+            raise NotImplementedError()
+
+        comp = self._makeOne()
+        _monkey, _events = self._wrapEvents()
+        with _monkey:
+            comp.registerHandler(_factory, (ifoo,), info=_info)
+        reg = comp.adapters._subscribers[1][ifoo][None][_blank]
+        self.assertEqual(len(reg), 1)
+        self.assertTrue(reg[0] is _factory)
+        self.assertEqual(comp._handler_registrations,
+                         [((ifoo,), _blank, _factory, _info)])
+        self.assertEqual(len(_events), 1)
+        args, kw = _events[0]
+        event, = args
+        self.assertEqual(kw, {})
+        self.assertTrue(isinstance(event, Registered))
+        self.assertTrue(isinstance(event.object, HandlerRegistration))
+        self.assertTrue(event.object.registry is comp)
+        self.assertEqual(event.object.required, (ifoo,))
+        self.assertEqual(event.object.name, _blank)
+        self.assertTrue(event.object.info is _info)
+        self.assertTrue(event.object.factory is _factory)
+
+    def test_registerHandler_wo_explicit_required_no_event(self):
+        from zope.interface.declarations import InterfaceClass
+
+        class IFoo(InterfaceClass):
+            pass
+        ifoo = IFoo('IFoo')
+        _info = u'info'
+        _blank = u''
+        class _Factory(object):
+            __component_adapts__ = (ifoo,)
+            pass
+
+        comp = self._makeOne()
+        _monkey, _events = self._wrapEvents()
+        with _monkey:
+            comp.registerHandler(_Factory, info=_info, event=False)
+        reg = comp.adapters._subscribers[1][ifoo][None][_blank]
+        self.assertEqual(len(reg), 1)
+        self.assertTrue(reg[0] is _Factory)
+        self.assertEqual(comp._handler_registrations,
+                         [((ifoo,), _blank, _Factory, _info)])
+        self.assertEqual(len(_events), 0)
+
+    def test_registeredHandlers_empty(self):
+        comp = self._makeOne()
+        self.assertFalse(list(comp.registeredHandlers()))
+
+    def test_registeredHandlers_non_empty(self):
+        from zope.interface.declarations import InterfaceClass
+        from zope.interface.registry import HandlerRegistration
+        class IFoo(InterfaceClass):
+            pass
+        ifoo = IFoo('IFoo')
+        def _factory1(context):
+            raise NotImplementedError()
+        def _factory2(context):
+            raise NotImplementedError()
+        comp = self._makeOne()
+        comp.registerHandler(_factory1, (ifoo,))
+        comp.registerHandler(_factory2, (ifoo,))
+        def _factory_name(x):
+            return x.factory.__code__.co_name
+        subscribers = sorted(comp.registeredHandlers(), key=_factory_name)
+        self.assertEqual(len(subscribers), 2)
+        self.assertTrue(isinstance(subscribers[0], HandlerRegistration))
+        self.assertEqual(subscribers[0].required, (ifoo,))
+        self.assertEqual(subscribers[0].name, '')
+        self.assertEqual(subscribers[0].factory, _factory1)
+        self.assertEqual(subscribers[0].info, '')
+        self.assertTrue(isinstance(subscribers[1], HandlerRegistration))
+        self.assertEqual(subscribers[1].required, (ifoo,))
+        self.assertEqual(subscribers[1].name, '')
+        self.assertEqual(subscribers[1].factory, _factory2)
+        self.assertEqual(subscribers[1].info, '')
+
+    def test_unregisterHandler_w_nonblank_name(self):
+        from zope.interface.declarations import InterfaceClass
+
+        class IFoo(InterfaceClass):
+            pass
+        ifoo = IFoo('IFoo')
+        _nonblank = u'nonblank'
+        comp = self._makeOne()
+        self.assertRaises(TypeError, comp.unregisterHandler,
+                          required=(ifoo,), name=_nonblank)
+
+    def test_unregisterHandler_neither_factory_nor_required(self):
+        comp = self._makeOne()
+        self.assertRaises(TypeError, comp.unregisterHandler)
+
+    def test_unregisterHandler_miss(self):
+        from zope.interface.declarations import InterfaceClass
+        class IFoo(InterfaceClass):
+            pass
+        ifoo = IFoo('IFoo')
+        comp = self._makeOne()
+        unreg = comp.unregisterHandler(required=(ifoo,))
+        self.assertFalse(unreg)
+
+    def test_unregisterHandler_hit_w_factory_and_explicit_provided(self):
+        from zope.interface.declarations import InterfaceClass
+        from zope.interface.interfaces import Unregistered
+        from zope.interface.registry import HandlerRegistration
+        class IFoo(InterfaceClass):
+            pass
+        ifoo = IFoo('IFoo')
+        comp = self._makeOne()
+        def _factory(context):
+            raise NotImplementedError()
+        comp = self._makeOne()
+        comp.registerHandler(_factory, (ifoo,))
+        _monkey, _events = self._wrapEvents()
+        with _monkey:
+            unreg = comp.unregisterHandler(_factory, (ifoo,))
+        self.assertTrue(unreg)
+        self.assertEqual(len(_events), 1)
+        args, kw = _events[0]
+        event, = args
+        self.assertEqual(kw, {})
+        self.assertTrue(isinstance(event, Unregistered))
+        self.assertTrue(isinstance(event.object, HandlerRegistration))
+        self.assertTrue(event.object.registry is comp)
+        self.assertEqual(event.object.required, (ifoo,))
+        self.assertEqual(event.object.name, '')
+        self.assertTrue(event.object.factory is _factory)
+
+    def test_unregisterHandler_hit_w_only_explicit_provided(self):
+        from zope.interface.declarations import InterfaceClass
+        from zope.interface.interfaces import Unregistered
+        from zope.interface.registry import HandlerRegistration
+        class IFoo(InterfaceClass):
+            pass
+        ifoo = IFoo('IFoo')
+        comp = self._makeOne()
+        def _factory(context):
+            raise NotImplementedError()
+        comp = self._makeOne()
+        comp.registerHandler(_factory, (ifoo,))
+        _monkey, _events = self._wrapEvents()
+        with _monkey:
+            unreg = comp.unregisterHandler(required=(ifoo,))
+        self.assertTrue(unreg)
+        self.assertEqual(len(_events), 1)
+        args, kw = _events[0]
+        event, = args
+        self.assertEqual(kw, {})
+        self.assertTrue(isinstance(event, Unregistered))
+        self.assertTrue(isinstance(event.object, HandlerRegistration))
+        self.assertTrue(event.object.registry is comp)
+        self.assertEqual(event.object.required, (ifoo,))
+        self.assertEqual(event.object.name, '')
+        self.assertTrue(event.object.factory is None)
+
+    def test_unregisterHandler_wo_explicit_required(self):
+        from zope.interface.declarations import InterfaceClass
+        from zope.interface.interfaces import Unregistered
+        from zope.interface.registry import HandlerRegistration
+        class IFoo(InterfaceClass):
+            pass
+        ifoo = IFoo('IFoo')
+        class _Factory(object):
+            __component_adapts__ = (ifoo,)
+
+        comp = self._makeOne()
+        comp.registerHandler(_Factory)
+        _monkey, _events = self._wrapEvents()
+        with _monkey:
+            unreg = comp.unregisterHandler(_Factory)
+        self.assertTrue(unreg)
+        self.assertEqual(len(_events), 1)
+        args, kw = _events[0]
+        event, = args
+        self.assertEqual(kw, {})
+        self.assertTrue(isinstance(event, Unregistered))
+        self.assertTrue(isinstance(event.object, HandlerRegistration))
+        self.assertTrue(event.object.registry is comp)
+        self.assertEqual(event.object.required, (ifoo,))
+        self.assertEqual(event.object.name, '')
+        self.assertEqual(event.object.info, '')
+        self.assertTrue(event.object.factory is _Factory)
+
+    def test_handle_empty(self):
+        from zope.interface.declarations import InterfaceClass
+        from zope.interface.declarations import implementer
+        class IFoo(InterfaceClass):
+            pass
+        ifoo = IFoo('IFoo')
+        comp = self._makeOne()
+        @implementer(ifoo)
+        class Bar(object):
+            pass
+        bar = Bar()
+        comp.handle((bar,)) # doesn't raise
+
+    def test_handle_non_empty(self):
+        from zope.interface.declarations import InterfaceClass
+        from zope.interface.declarations import implementer
+        class IFoo(InterfaceClass):
+            pass
+        ifoo = IFoo('IFoo')
+        _called_1 = []
+        def _factory_1(context):
+                _called_1.append(context)
+        _called_2 = []
+        def _factory_2(context):
+                _called_2.append(context)
+        comp = self._makeOne()
+        comp.registerHandler(_factory_1, (ifoo,))
+        comp.registerHandler(_factory_2, (ifoo,))
+        @implementer(ifoo)
+        class Bar(object):
+            pass
+        bar = Bar()
+        comp.handle(bar)
+        self.assertEqual(_called_1, [bar])
+        self.assertEqual(_called_2, [bar])
+
+    def test_register_unregister_identical_objects_provided(self, identical=True):
+        # https://github.com/zopefoundation/zope.interface/issues/227
+        class IFoo(Interface):
+            pass
+
+        comp = self._makeOne()
+        first = object()
+        second = first if identical else object()
+
+        comp.registerUtility(first, provided=IFoo)
+        comp.registerUtility(second, provided=IFoo, name='bar')
+
+        self.assertEqual(len(comp.utilities._subscribers), 1)
+        self.assertEqual(comp.utilities._subscribers, [{
+            IFoo: {'': (first, ) if identical else (first, second)}
+        }])
+        self.assertEqual(comp.utilities._provided, {
+            IFoo: 3 if identical else 4
+        })
+
+        res = comp.unregisterUtility(first, provided=IFoo)
+        self.assertTrue(res)
+        res = comp.unregisterUtility(second, provided=IFoo, name='bar')
+        self.assertTrue(res)
+
+        self.assertEqual(comp.utilities._provided, {})
+        self.assertEqual(len(comp.utilities._subscribers), 0)
+
+    def test_register_unregister_nonequal_objects_provided(self):
+        self.test_register_unregister_identical_objects_provided(identical=False)
+
+    def test_rebuildUtilityRegistryFromLocalCache(self):
+        class IFoo(Interface):
+            "Does nothing"
+
+        class UtilityImplementingFoo(object):
+            "Does nothing"
+
+        comps = self._makeOne()
+
+        for i in range(30):
+            comps.registerUtility(UtilityImplementingFoo(), IFoo, name=u'%s' % (i,))
+
+        orig_generation = comps.utilities._generation
+
+        orig_adapters = comps.utilities._adapters
+        self.assertEqual(len(orig_adapters), 1)
+        self.assertEqual(len(orig_adapters[0]), 1)
+        self.assertEqual(len(orig_adapters[0][IFoo]), 30)
+
+        orig_subscribers = comps.utilities._subscribers
+        self.assertEqual(len(orig_subscribers), 1)
+        self.assertEqual(len(orig_subscribers[0]), 1)
+        self.assertEqual(len(orig_subscribers[0][IFoo]), 1)
+        self.assertEqual(len(orig_subscribers[0][IFoo][u'']), 30)
+
+        # Blow a bunch of them away, creating artificial corruption
+        new_adapters = comps.utilities._adapters = type(orig_adapters)()
+        new_adapters.append({})
+        d = new_adapters[0][IFoo] = {}
+        for name in range(10):
+            name = type(u'')(str(name))
+            d[name] = orig_adapters[0][IFoo][name]
+
+        self.assertNotEqual(orig_adapters, new_adapters)
+
+        new_subscribers = comps.utilities._subscribers = type(orig_subscribers)()
+        new_subscribers.append({})
+        d = new_subscribers[0][IFoo] = {}
+        d[u''] = ()
+
+        for name in range(5, 12): # 12 - 5 = 7
+            name = type(u'')(str(name))
+            comp = orig_adapters[0][IFoo][name]
+            d[u''] += (comp,)
+
+        # We can preflight (by default) and nothing changes
+        rebuild_results_preflight = comps.rebuildUtilityRegistryFromLocalCache()
+
+        self.assertEqual(comps.utilities._generation, orig_generation)
+        self.assertEqual(rebuild_results_preflight, {
+            'did_not_register': 10,
+            'needed_registered': 20,
+
+            'did_not_subscribe': 7,
+            'needed_subscribed': 23,
+        })
+
+        # Now for real
+        rebuild_results = comps.rebuildUtilityRegistryFromLocalCache(rebuild=True)
+
+        # The generation only got incremented once
+        self.assertEqual(comps.utilities._generation, orig_generation + 1)
+        # The result was the same
+        self.assertEqual(rebuild_results_preflight, rebuild_results)
+        self.assertEqual(new_adapters, orig_adapters)
+        self.assertEqual(
+            len(new_subscribers[0][IFoo][u'']),
+            len(orig_subscribers[0][IFoo][u'']))
+
+        for orig_subscriber in orig_subscribers[0][IFoo][u'']:
+            self.assertIn(orig_subscriber, new_subscribers[0][IFoo][u''])
+
+        # Preflighting, rebuilding again produce no changes.
+        preflight_after = comps.rebuildUtilityRegistryFromLocalCache()
+        self.assertEqual(preflight_after, {
+            'did_not_register': 30,
+            'needed_registered': 0,
+
+            'did_not_subscribe': 30,
+            'needed_subscribed': 0,
+        })
+
+        rebuild_after = comps.rebuildUtilityRegistryFromLocalCache(rebuild=True)
+        self.assertEqual(rebuild_after, preflight_after)
+        self.assertEqual(comps.utilities._generation, orig_generation + 1)
+
+
+class UnhashableComponentsTests(ComponentsTests):
+
+    def _getTargetClass(self):
+        # Mimic what pyramid does to create an unhashable
+        # registry
+        class Components(super(UnhashableComponentsTests, self)._getTargetClass(), dict):
+            pass
+        return Components
+
+# Test _getUtilityProvided, _getAdapterProvided, _getAdapterRequired via their
+# callers (Component.registerUtility, Component.registerAdapter).
+
+
+class UtilityRegistrationTests(unittest.TestCase):
+
+    def _getTargetClass(self):
+        from zope.interface.registry import UtilityRegistration
+        return UtilityRegistration
+
+    def _makeOne(self, component=None, factory=None):
+        from zope.interface.declarations import InterfaceClass
+
+        class InterfaceClassSubclass(InterfaceClass):
+            pass
+
+        ifoo = InterfaceClassSubclass('IFoo')
+        class _Registry(object):
+            def __repr__(self):
+                return '_REGISTRY'
+        registry = _Registry()
+        name = u'name'
+        doc = 'DOCSTRING'
+        klass = self._getTargetClass()
+        return (klass(registry, ifoo, name, component, doc, factory),
+                registry,
+                name,
+               )
+
+    def test_class_conforms_to_IUtilityRegistration(self):
+        from zope.interface.verify import verifyClass
+        from zope.interface.interfaces import IUtilityRegistration
+        verifyClass(IUtilityRegistration, self._getTargetClass())
+
+    def test_instance_conforms_to_IUtilityRegistration(self):
+        from zope.interface.verify import verifyObject
+        from zope.interface.interfaces import IUtilityRegistration
+        ur, _, _ =  self._makeOne()
+        verifyObject(IUtilityRegistration, ur)
+
+    def test___repr__(self):
+        class _Component(object):
+            __name__ = 'TEST'
+        _component = _Component()
+        ur, _registry, _name = self._makeOne(_component)
+        self.assertEqual(repr(ur),
+            "UtilityRegistration(_REGISTRY, IFoo, %r, TEST, None, 'DOCSTRING')"
+                            % (_name))
+
+    def test___repr___provided_wo_name(self):
+        class _Component(object):
+            def __repr__(self):
+                return 'TEST'
+        _component = _Component()
+        ur, _registry, _name = self._makeOne(_component)
+        ur.provided = object()
+        self.assertEqual(repr(ur),
+            "UtilityRegistration(_REGISTRY, None, %r, TEST, None, 'DOCSTRING')"
+                            % (_name))
+
+    def test___repr___component_wo_name(self):
+        class _Component(object):
+            def __repr__(self):
+                return 'TEST'
+        _component = _Component()
+        ur, _registry, _name = self._makeOne(_component)
+        ur.provided = object()
+        self.assertEqual(repr(ur),
+            "UtilityRegistration(_REGISTRY, None, %r, TEST, None, 'DOCSTRING')"
+                            % (_name))
+
+    def test___hash__(self):
+        _component = object()
+        ur, _registry, _name = self._makeOne(_component)
+        self.assertEqual(ur.__hash__(), id(ur))
+
+    def test___eq___identity(self):
+        _component = object()
+        ur, _registry, _name = self._makeOne(_component)
+        self.assertTrue(ur == ur)
+
+    def test___eq___hit(self):
+        _component = object()
+        ur, _registry, _name = self._makeOne(_component)
+        ur2, _, _ = self._makeOne(_component)
+        self.assertTrue(ur == ur2)
+
+    def test___eq___miss(self):
+        _component = object()
+        _component2 = object()
+        ur, _registry, _name = self._makeOne(_component)
+        ur2, _, _ = self._makeOne(_component2)
+        self.assertFalse(ur == ur2)
+
+    def test___ne___identity(self):
+        _component = object()
+        ur, _registry, _name = self._makeOne(_component)
+        self.assertFalse(ur != ur)
+
+    def test___ne___hit(self):
+        _component = object()
+        ur, _registry, _name = self._makeOne(_component)
+        ur2, _, _ = self._makeOne(_component)
+        self.assertFalse(ur != ur2)
+
+    def test___ne___miss(self):
+        _component = object()
+        _component2 = object()
+        ur, _registry, _name = self._makeOne(_component)
+        ur2, _, _ = self._makeOne(_component2)
+        self.assertTrue(ur != ur2)
+
+    def test___lt___identity(self):
+        _component = object()
+        ur, _registry, _name = self._makeOne(_component)
+        self.assertFalse(ur < ur)
+
+    def test___lt___hit(self):
+        _component = object()
+        ur, _registry, _name = self._makeOne(_component)
+        ur2, _, _ = self._makeOne(_component)
+        self.assertFalse(ur < ur2)
+
+    def test___lt___miss(self):
+        _component = object()
+        _component2 = object()
+        ur, _registry, _name = self._makeOne(_component)
+        ur2, _, _ = self._makeOne(_component2)
+        ur2.name = _name + '2'
+        self.assertTrue(ur < ur2)
+
+    def test___le___identity(self):
+        _component = object()
+        ur, _registry, _name = self._makeOne(_component)
+        self.assertTrue(ur <= ur)
+
+    def test___le___hit(self):
+        _component = object()
+        ur, _registry, _name = self._makeOne(_component)
+        ur2, _, _ = self._makeOne(_component)
+        self.assertTrue(ur <= ur2)
+
+    def test___le___miss(self):
+        _component = object()
+        _component2 = object()
+        ur, _registry, _name = self._makeOne(_component)
+        ur2, _, _ = self._makeOne(_component2)
+        ur2.name = _name + '2'
+        self.assertTrue(ur <= ur2)
+
+    def test___gt___identity(self):
+        _component = object()
+        ur, _registry, _name = self._makeOne(_component)
+        self.assertFalse(ur > ur)
+
+    def test___gt___hit(self):
+        _component = object()
+        _component2 = object()
+        ur, _registry, _name = self._makeOne(_component)
+        ur2, _, _ = self._makeOne(_component2)
+        ur2.name = _name + '2'
+        self.assertTrue(ur2 > ur)
+
+    def test___gt___miss(self):
+        _component = object()
+        ur, _registry, _name = self._makeOne(_component)
+        ur2, _, _ = self._makeOne(_component)
+        self.assertFalse(ur2 > ur)
+
+    def test___ge___identity(self):
+        _component = object()
+        ur, _registry, _name = self._makeOne(_component)
+        self.assertTrue(ur >= ur)
+
+    def test___ge___miss(self):
+        _component = object()
+        _component2 = object()
+        ur, _registry, _name = self._makeOne(_component)
+        ur2, _, _ = self._makeOne(_component2)
+        ur2.name = _name + '2'
+        self.assertFalse(ur >= ur2)
+
+    def test___ge___hit(self):
+        _component = object()
+        ur, _registry, _name = self._makeOne(_component)
+        ur2, _, _ = self._makeOne(_component)
+        ur2.name = _name + '2'
+        self.assertTrue(ur2 >= ur)
+
+
+class AdapterRegistrationTests(unittest.TestCase):
+
+    def _getTargetClass(self):
+        from zope.interface.registry import AdapterRegistration
+        return AdapterRegistration
+
+    def _makeOne(self, component=None):
+        from zope.interface.declarations import InterfaceClass
+
+        class IFoo(InterfaceClass):
+            pass
+        ifoo = IFoo('IFoo')
+        ibar = IFoo('IBar')
+        class _Registry(object):
+            def __repr__(self):
+                return '_REGISTRY'
+        registry = _Registry()
+        name = u'name'
+        doc = 'DOCSTRING'
+        klass = self._getTargetClass()
+        return (klass(registry, (ibar,), ifoo, name, component, doc),
+                registry,
+                name,
+               )
+
+    def test_class_conforms_to_IAdapterRegistration(self):
+        from zope.interface.verify import verifyClass
+        from zope.interface.interfaces import IAdapterRegistration
+        verifyClass(IAdapterRegistration, self._getTargetClass())
+
+    def test_instance_conforms_to_IAdapterRegistration(self):
+        from zope.interface.verify import verifyObject
+        from zope.interface.interfaces import IAdapterRegistration
+        ar, _, _ =  self._makeOne()
+        verifyObject(IAdapterRegistration, ar)
+
+    def test___repr__(self):
+        class _Component(object):
+            __name__ = 'TEST'
+        _component = _Component()
+        ar, _registry, _name = self._makeOne(_component)
+        self.assertEqual(repr(ar),
+            ("AdapterRegistration(_REGISTRY, [IBar], IFoo, %r, TEST, "
+           + "'DOCSTRING')") % (_name))
+
+    def test___repr___provided_wo_name(self):
+        class _Component(object):
+            def __repr__(self):
+                return 'TEST'
+        _component = _Component()
+        ar, _registry, _name = self._makeOne(_component)
+        ar.provided = object()
+        self.assertEqual(repr(ar),
+            ("AdapterRegistration(_REGISTRY, [IBar], None, %r, TEST, "
+           + "'DOCSTRING')") % (_name))
+
+    def test___repr___component_wo_name(self):
+        class _Component(object):
+            def __repr__(self):
+                return 'TEST'
+        _component = _Component()
+        ar, _registry, _name = self._makeOne(_component)
+        ar.provided = object()
+        self.assertEqual(repr(ar),
+            ("AdapterRegistration(_REGISTRY, [IBar], None, %r, TEST, "
+           + "'DOCSTRING')") % (_name))
+
+    def test___hash__(self):
+        _component = object()
+        ar, _registry, _name = self._makeOne(_component)
+        self.assertEqual(ar.__hash__(), id(ar))
+
+    def test___eq___identity(self):
+        _component = object()
+        ar, _registry, _name = self._makeOne(_component)
+        self.assertTrue(ar == ar)
+
+    def test___eq___hit(self):
+        _component = object()
+        ar, _registry, _name = self._makeOne(_component)
+        ar2, _, _ = self._makeOne(_component)
+        self.assertTrue(ar == ar2)
+
+    def test___eq___miss(self):
+        _component = object()
+        _component2 = object()
+        ar, _registry, _name = self._makeOne(_component)
+        ar2, _, _ = self._makeOne(_component2)
+        self.assertFalse(ar == ar2)
+
+    def test___ne___identity(self):
+        _component = object()
+        ar, _registry, _name = self._makeOne(_component)
+        self.assertFalse(ar != ar)
+
+    def test___ne___miss(self):
+        _component = object()
+        ar, _registry, _name = self._makeOne(_component)
+        ar2, _, _ = self._makeOne(_component)
+        self.assertFalse(ar != ar2)
+
+    def test___ne___hit_component(self):
+        _component = object()
+        _component2 = object()
+        ar, _registry, _name = self._makeOne(_component)
+        ar2, _, _ = self._makeOne(_component2)
+        self.assertTrue(ar != ar2)
+
+    def test___ne___hit_provided(self):
+        from zope.interface.declarations import InterfaceClass
+        class IFoo(InterfaceClass):
+            pass
+        ibaz = IFoo('IBaz')
+        _component = object()
+        ar, _registry, _name = self._makeOne(_component)
+        ar2, _, _ = self._makeOne(_component)
+        ar2.provided = ibaz
+        self.assertTrue(ar != ar2)
+
+    def test___ne___hit_required(self):
+        from zope.interface.declarations import InterfaceClass
+        class IFoo(InterfaceClass):
+            pass
+        ibaz = IFoo('IBaz')
+        _component = object()
+        _component2 = object()
+        ar, _registry, _name = self._makeOne(_component)
+        ar2, _, _ = self._makeOne(_component2)
+        ar2.required = (ibaz,)
+        self.assertTrue(ar != ar2)
+
+    def test___lt___identity(self):
+        _component = object()
+        ar, _registry, _name = self._makeOne(_component)
+        self.assertFalse(ar < ar)
+
+    def test___lt___hit(self):
+        _component = object()
+        ar, _registry, _name = self._makeOne(_component)
+        ar2, _, _ = self._makeOne(_component)
+        self.assertFalse(ar < ar2)
+
+    def test___lt___miss(self):
+        _component = object()
+        _component2 = object()
+        ar, _registry, _name = self._makeOne(_component)
+        ar2, _, _ = self._makeOne(_component2)
+        ar2.name = _name + '2'
+        self.assertTrue(ar < ar2)
+
+    def test___le___identity(self):
+        _component = object()
+        ar, _registry, _name = self._makeOne(_component)
+        self.assertTrue(ar <= ar)
+
+    def test___le___hit(self):
+        _component = object()
+        ar, _registry, _name = self._makeOne(_component)
+        ar2, _, _ = self._makeOne(_component)
+        self.assertTrue(ar <= ar2)
+
+    def test___le___miss(self):
+        _component = object()
+        _component2 = object()
+        ar, _registry, _name = self._makeOne(_component)
+        ar2, _, _ = self._makeOne(_component2)
+        ar2.name = _name + '2'
+        self.assertTrue(ar <= ar2)
+
+    def test___gt___identity(self):
+        _component = object()
+        ar, _registry, _name = self._makeOne(_component)
+        self.assertFalse(ar > ar)
+
+    def test___gt___hit(self):
+        _component = object()
+        _component2 = object()
+        ar, _registry, _name = self._makeOne(_component)
+        ar2, _, _ = self._makeOne(_component2)
+        ar2.name = _name + '2'
+        self.assertTrue(ar2 > ar)
+
+    def test___gt___miss(self):
+        _component = object()
+        ar, _registry, _name = self._makeOne(_component)
+        ar2, _, _ = self._makeOne(_component)
+        self.assertFalse(ar2 > ar)
+
+    def test___ge___identity(self):
+        _component = object()
+        ar, _registry, _name = self._makeOne(_component)
+        self.assertTrue(ar >= ar)
+
+    def test___ge___miss(self):
+        _component = object()
+        _component2 = object()
+        ar, _registry, _name = self._makeOne(_component)
+        ar2, _, _ = self._makeOne(_component2)
+        ar2.name = _name + '2'
+        self.assertFalse(ar >= ar2)
+
+    def test___ge___hit(self):
+        _component = object()
+        ar, _registry, _name = self._makeOne(_component)
+        ar2, _, _ = self._makeOne(_component)
+        ar2.name = _name + '2'
+        self.assertTrue(ar2 >= ar)
+
+
+class SubscriptionRegistrationTests(unittest.TestCase):
+
+    def _getTargetClass(self):
+        from zope.interface.registry import SubscriptionRegistration
+        return SubscriptionRegistration
+
+    def _makeOne(self, component=None):
+        from zope.interface.declarations import InterfaceClass
+
+        class IFoo(InterfaceClass):
+            pass
+        ifoo = IFoo('IFoo')
+        ibar = IFoo('IBar')
+        class _Registry(object):
+            def __repr__(self): # pragma: no cover
+                return '_REGISTRY'
+        registry = _Registry()
+        name = u'name'
+        doc = 'DOCSTRING'
+        klass = self._getTargetClass()
+        return (klass(registry, (ibar,), ifoo, name, component, doc),
+                registry,
+                name,
+               )
+
+    def test_class_conforms_to_ISubscriptionAdapterRegistration(self):
+        from zope.interface.verify import verifyClass
+        from zope.interface.interfaces import ISubscriptionAdapterRegistration
+        verifyClass(ISubscriptionAdapterRegistration, self._getTargetClass())
+
+    def test_instance_conforms_to_ISubscriptionAdapterRegistration(self):
+        from zope.interface.verify import verifyObject
+        from zope.interface.interfaces import ISubscriptionAdapterRegistration
+        sar, _, _ =  self._makeOne()
+        verifyObject(ISubscriptionAdapterRegistration, sar)
+
+
+class HandlerRegistrationTests(unittest.TestCase):
+
+    def _getTargetClass(self):
+        from zope.interface.registry import HandlerRegistration
+        return HandlerRegistration
+
+    def _makeOne(self, component=None):
+        from zope.interface.declarations import InterfaceClass
+
+        class IFoo(InterfaceClass):
+            pass
+        ifoo = IFoo('IFoo')
+        class _Registry(object):
+            def __repr__(self):
+                return '_REGISTRY'
+        registry = _Registry()
+        name = u'name'
+        doc = 'DOCSTRING'
+        klass = self._getTargetClass()
+        return (klass(registry, (ifoo,), name, component, doc),
+                registry,
+                name,
+               )
+
+    def test_class_conforms_to_IHandlerRegistration(self):
+        from zope.interface.verify import verifyClass
+        from zope.interface.interfaces import IHandlerRegistration
+        verifyClass(IHandlerRegistration, self._getTargetClass())
+
+    def test_instance_conforms_to_IHandlerRegistration(self):
+        from zope.interface.verify import verifyObject
+        from zope.interface.interfaces import IHandlerRegistration
+        hr, _, _ =  self._makeOne()
+        verifyObject(IHandlerRegistration, hr)
+
+    def test_properties(self):
+        def _factory(context):
+            raise NotImplementedError()
+        hr, _, _ =  self._makeOne(_factory)
+        self.assertTrue(hr.handler is _factory)
+        self.assertTrue(hr.factory is hr.handler)
+        self.assertTrue(hr.provided is None)
+
+    def test___repr___factory_w_name(self):
+        class _Factory(object):
+            __name__ = 'TEST'
+        hr, _registry, _name =  self._makeOne(_Factory())
+        self.assertEqual(repr(hr),
+            ("HandlerRegistration(_REGISTRY, [IFoo], %r, TEST, "
+           + "'DOCSTRING')") % (_name))
+
+    def test___repr___factory_wo_name(self):
+        class _Factory(object):
+            def __repr__(self):
+                return 'TEST'
+        hr, _registry, _name =  self._makeOne(_Factory())
+        self.assertEqual(repr(hr),
+            ("HandlerRegistration(_REGISTRY, [IFoo], %r, TEST, "
+           + "'DOCSTRING')") % (_name))
+
+class PersistentAdapterRegistry(VerifyingAdapterRegistry):
+
+    def __getstate__(self):
+        state = self.__dict__.copy()
+        for k in list(state):
+            if k in self._delegated or k.startswith('_v'):
+                state.pop(k)
+        state.pop('ro', None)
+        return state
+
+    def __setstate__(self, state):
+        bases = state.pop('__bases__', ())
+        self.__dict__.update(state)
+        self._createLookup()
+        self.__bases__ = bases
+        self._v_lookup.changed(self)
+
+class PersistentComponents(Components):
+    # Mimic zope.component.persistentregistry.PersistentComponents:
+    # we should be picklalable, but not persistent.Persistent ourself.
+
+    def _init_registries(self):
+        self.adapters = PersistentAdapterRegistry()
+        self.utilities = PersistentAdapterRegistry()
+
+class PersistentDictComponents(PersistentComponents, dict):
+    # Like Pyramid's Registry, we subclass Components and dict
+    pass
+
+
+class PersistentComponentsDict(dict, PersistentComponents):
+    # Like the above, but inheritance is flipped
+    def __init__(self, name):
+        dict.__init__(self)
+        PersistentComponents.__init__(self, name)
+
+class TestPersistentComponents(unittest.TestCase):
+
+    def _makeOne(self):
+        return PersistentComponents('test')
+
+    def _check_equality_after_pickle(self, made):
+        pass
+
+    def test_pickles_empty(self):
+        import pickle
+        comp = self._makeOne()
+        pickle.dumps(comp)
+        comp2 = pickle.loads(pickle.dumps(comp))
+
+        self.assertEqual(comp2.__name__, 'test')
+
+    def test_pickles_with_utility_registration(self):
+        import pickle
+        comp = self._makeOne()
+        utility = object()
+        comp.registerUtility(
+            utility,
+            Interface)
+
+        self.assertIs(utility,
+                      comp.getUtility(Interface))
+
+        comp2 = pickle.loads(pickle.dumps(comp))
+        self.assertEqual(comp2.__name__, 'test')
+
+        # The utility is still registered
+        self.assertIsNotNone(comp2.getUtility(Interface))
+
+        # We can register another one
+        comp2.registerUtility(
+            utility,
+            Interface)
+        self.assertIs(utility,
+                      comp2.getUtility(Interface))
+
+        self._check_equality_after_pickle(comp2)
+
+
+class TestPersistentDictComponents(TestPersistentComponents):
+
+    def _getTargetClass(self):
+        return PersistentDictComponents
+
+    def _makeOne(self):
+        comp = self._getTargetClass()(name='test')
+        comp['key'] = 42
+        return comp
+
+    def _check_equality_after_pickle(self, made):
+        self.assertIn('key', made)
+        self.assertEqual(made['key'], 42)
+
+class TestPersistentComponentsDict(TestPersistentDictComponents):
+
+    def _getTargetClass(self):
+        return PersistentComponentsDict
+
+class _Monkey(object):
+    # context-manager for replacing module names in the scope of a test.
+    def __init__(self, module, **kw):
+        self.module = module
+        self.to_restore = dict([(key, getattr(module, key)) for key in kw])
+        for key, value in kw.items():
+            setattr(module, key, value)
+
+    def __enter__(self):
+        return self
+
+    def __exit__(self, exc_type, exc_val, exc_tb):
+        for key, value in self.to_restore.items():
+            setattr(self.module, key, value)