gistfile1.py

class MyModelA(models.Model):
    model_b = models.ForeignKey(MyModelB, blank=True, null=True)


class MyModelB(models.Model):
    name = models.CharField(max_length=10)


# Fixtureless use case
from django.test import TestCase
from fixtureless import Factory

from my_models import MyModelA, MyModelB


class MyTestCase(TestCase):
    def setUp(self):
        factory = Factory()
        self.model_b = factory.create(MyModelB)

        init_dict = {'model_b': self.model_b}
        self.model_a = factory.create(MyModelA, init_dict)

    def test_this(self):
        self.assertEqual(self.model_a.model_b, self.model_b)