Removed model_package test dependency on contrib.sites

from django.contrib.sites.models import Site

from django.db import models

class Site(models.Model):

    name = models.CharField(max_length=100)

class Article(models.Model):

    sites = models.ManyToManyField(Site)

    headline = models.CharField(max_length=100)

from __future__ import unicode_literals

from django.contrib.sites.models import Site

from django.db import models, connection

from django.db.backends.utils import truncate_name

from django.test import TestCase

from .models.publication import Publication

from .models.article import Article

from .models.article import Article, Site

class Advertisement(models.Model):

class ModelPackageTests(TestCase):

    @classmethod

    def setUpClass(cls):

        super(ModelPackageTests, cls).setUpClass()

        # This cleanup is necessary because contrib.sites cache

        # makes tests interfere with each other, see #11505

        Site.objects.clear_cache()

    def test_m2m_tables_in_subpackage_models(self):

        """

        Regression for #12168: models split into subpackages still get M2M

        """

        p = Publication.objects.create(title="FooBar")

        current_site = Site.objects.get_current()

        self.assertEqual(current_site.domain, "example.com")

        site = Site.objects.create(name="example.com")

        a = Article.objects.create(headline="a foo headline")

        a.publications.add(p)

        a.sites.add(current_site)

        a.sites.add(site)

        a = Article.objects.get(id=a.pk)

        self.assertEqual(a.id, a.pk)