A doctest with functional layer
-------------------------------

We can also define ZCML layers using ``layer``. Then the tests will be
registered using a functional setup.

:doctest:
:layer: z3c.testsetup.tests.othercave.testing.FunctionalLayer1

  >>> root = getRootFolder()
  >>> root
  <zope.site.folder.Folder object at 0x...>
