def create_test_models(self):
self.a1 = AModel.create(a_field='a1')
self.a2 = AModel.create(a_field='a2')
self.b1 = BModel.create(b_field='b1', a=self.a1)
self.b2 = BModel.create(b_field='b2', a=self.a2)
self.c1 = CModel.create(c_field='c1', b=self.b1)
self.c2 = CModel.create(c_field='c2', b=self.b2)
self.e1 = EModel.create(e_field='e1')
self.e2 = EModel.create(e_field='e2')
self.f1 = FModel.create(f_field='f1', e=self.e1)
self.f2 = FModel.create(f_field='f2')
