'Override in a subclass to return a L{INewsStorage} provider to test for
correct moderation behavior.
@param groups: A C{list} of C{str} naming the groups which should exist
in the resulting storage object.
@param moderators: A C{dict} mapping C{str} each group name to a C{list}
of C{str} giving moderator email (RFC 2821) addresses.'

def getStorage(self, groups, moderators, mailhost, sender):

    raise NotImplementedError()
