Django test auto_now DateTime Fields

test_auto_now_DateTime_Fields.md

class Article(models.Model):    
    title = models.CharField()
    content = models.TextField()
    created = models.DateTimeField(auto_now_add=True)
    modified = models.DateTimeField(auto_now=True)

I want to an article which was created and modified yesterday. And test the things today.

from datetime import timedelta, datetime
import mock
class YesterdayTestCase(TestCase):
    def setUp(self):
        yesterday = datetime.now() - timedelta(days=1)
        with mock.patch('django.utils.timezone.now') as mock_now:
            mock_now.return_value = yesterday
            self.article = Article.objects.create(
                title = 'Article Title',
                content = 'Article Content'
            )

            

REF

Testing auto_now DateTime Fields in Django — Kogan.com Dev Blog