factory_boyどうやって使うのかいまいち分からない

djanto-factory_boy.py

from django.test import TestCase
from . import models
import factory

class PollFactory(factory.Factory):
    FACTORY_FOR = models.Poll

    question = "What's up?"
    pub_date = '2013-02-22'

class FactoryBoyTest(TestCase):
    def test_factory(self):
        poll = PollFactory.create()

        choice = models.Choice(
                poll=models.Poll.objects.get(id=poll.id),
                choice="hoge",
                votes=1)

        self.assertEqual(choice.poll.question, "What's up?")