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Test helpers to temporarily alter zope.component registrations

Project Description

This packages allows you to replace, add or delete zope.component registrations of utilities, adapters and event handlers, and to later on undo the changes you made.


To change something in a registry, instantiate gocept.zcapatch.Patches for that registry (if no registry is given, the current one as returned by zope.component.getSiteManager() is used). It offers the following methods:

patch_utility(new, provided=None, name=u’‘, registry=None):

Register the given new object as a utility, instead of what is currently registered for this interface (and name).

If no provided interface is given, it is read from the object’s zope.interface.implements declaration.

If you want to delete a utility registration, pass new=None.

patch_adapter(factory, required=None, provided=None, name=u’‘, registry=None):

Register the given factory as an adapter, instead of what is currently registered for these required and provided interfaces (and name).

Any of the required or provided interfaces not given will be read from the object’s zope.component.adapts and zope.interface.implements declarations.

If you want to delete an adapter registration, pass factory=lambda *args: None.

patch_handler(handler, required, registry=None):

Register the given handler instead of what is currently registered for the required interfaces.

If no required interfaces are given, they are read from the object’s zope.component.adapts declaration.

If you want to delete a handler registration, use remove_handler.

remove_handler(handler, required=None, registry=None):

Delete the specified registration of handler. (Since handlers are set-valued, you cannot delete one without explicitly specifying which one you mean.)

If no required interfaces are given, they are read from the object’s zope.component.adapts declaration.


Undo all changes made via this Patches instance: Unregister all utilities, adapters and handlers added, and restore any previously present registrations that were replaced or removed.

Here’s a typical usage example:

import gocept.zcapatch
import unittest

class TestCase(unittest.TestCase):

    def setUp(self):
        self.zca = gocept.zcapatch.Patches()

    def tearDown(self):

    def test_something(self):


plone.testing provides the ability to create a stack of registries, where each delegates to the previous one (plone.testing.zca.pushGlobalRegistry / popGlobalRegistry) – so you could, for example, push a new registry for each test, manipulate that at will, and throw it away afterwards. While this approach is much more elegant than the one provided by gocept.zcapatch for common use cases, do note the following limitations:

  • plone.testing only ever deals with zope.component.getGlobalSiteManager(), so you can’t stack other registries (e.g. LocalSiteManagers as implemented by
  • plone.testing does not allow you to (temporarily) delete registrations from the registry.


The mercurial repository of the source code as well as the issue tracker are available at <>.


1.0 (2011-12-01)

  • first release.
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