Django model method mocking

models.py

class Blog(django.model):
  name = models.CharField(null=False, max_length=64)
  
  def list_articles(self):
    return [
      {'body': 'abcdefg'},
      {'body': 'abcdefg'},
      {'body': 'abcdefg'},
    ]

tests.py

import mock  # python 2.7

@mock.patch('blog.models.Blog.list_articles')
class BlogFunctionalTestCase(django.test.TestCase):
  
  def test_blog__list_articles(self, mock_list):
    blog = Blog.objects.create(
      name = 'abc blog'
    )
    mock_list.return_value = [
      {'body': 'abcdefg'},
      {'body': 'abcdefg'},
      {'body': 'abcdefg'},
    ]
    articles = blog.list_articles()
    self.assertIsNone(articles)