Testing with a custom user model as a ForeignKey in Django 1.5

I'm using Django 1.5 and I'm trying to make an application work with
any custom user model.

The issue is that I want to be able to test the app as well, but I
can't find a way to make `ForeignKey` model fields to test correctly
using custom user models. When I run the test case attached below, I
get this error:

ValueError: Cannot assign "<NewCustomUser: alice@bob.net>":
"ModelWithForeign.user" must be a "User" instance.

This is the file I'm using for testing:

from django.conf import settings
from django.contrib.auth import get_user_model
from django.contrib.auth.tests.custom_user import CustomUser,
CustomUserManager
from django.db import models
from django.test import TestCase
from django.test.utils import override_settings

class NewCustomUser(CustomUser):
objects = CustomUserManager()
class Meta:
app_label = 'myapp'

class ModelWithForeign(models.Model):
user = models.ForeignKey(settings.AUTH_USER_MODEL)

@override_settings(
AUTH_USER_MODEL = 'myapp.NewCustomUser'
)
class MyTest(TestCase):
user_info = {
'email': 'alice@bob.net',
'date_of_birth': '2013-03-12',
'password': 'password1'
}

def test_failing(self):
u = get_user_model()(**self.user_info)
m = ModelWithForeign(user=u)
m.save()

I'm referencing the user model in the `ForeignKey` argument list as
described in https://docs.djangoproject.com/en/dev/topics/auth/customizing/#django.contrib.auth.get_user_model,
but using `get_user_model` there doesn't change anything, as the
`user` attribute is evaluated before the setting change takes place.
Is there a way to make this ForeignKey play nice with testing when I'm
using custom user models?

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