- The ``repoze.bfg.testing.setUp`` function now accepts three extra

  optional keyword arguments: ``registry``, ``request`` and
  ``hook_zca``.

  If the ``registry`` argument is not ``None``, the argument will be
  treated as the registry that is set as the "current registry" (it
  will be returned by ``repoze.bfg.threadlocal.get_current_registry``)
  for the duration of the test.  If the ``registry`` argument is
  ``None`` (the default), a new registry is created and used for the
  duration of the test.

  The value of the ``request`` argument is used as the "current
  request" (it will be returned by
  ``repoze.bfg.threadlocal.get_current_request``) for the duration of
  the test; it defaults to ``None``.

  If ``hook_zca`` is ``True`` (the default), the
  ``zope.component.getSiteManager`` function will be hooked with a
  function that returns the value of ``registry`` (or the
  default-created registry if ``registry`` is ``None``) instead of the
  registry returned by ``zope.component.getGlobalSiteManager``,
  causing the Zope Component Architecture API (``getSiteManager``,
  ``getAdapter``, ``getUtility``, and so on) to use the registry we're
  using for testing instead of the global ZCA registry.

- The ``repoze.bfg.testing.tearDown`` function now accepts an
  ``unhook_zca`` argument.  If this argument is ``True`` (the
  default), ``zope.component.getSiteManager.reset()`` will be called,
  causing the "base" registry to once again start returnining the
  result of ``zope.component.getSiteManager``.

- Remove hook_zca and unhook_zca methods from Configurator.

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