>>> from Products.CMFCore.utils import getToolByName
    >>> from tagger.zope3.interfaces import ITagger, IUser
    >>> portal = self.portal
    >>> catalog = getToolByName(portal, 'portal_catalog')
    >>> request = self.folder.REQUEST
    >>> tag = "I'm a tag!"
    >>> nodes=tagger.tag_item(self.folder, request, [tag])
    >>> tagger.getUsersFor(content)==set([user])