[Django]-Test Django admin form

You have to log the client in:

c = Client()
c.login(username='your_username', password='your_password')
response = c.post(change_url, data)

The most correct way to define change_url is using reverse(). You can browse the docs to find the correct way to do this. For example:

change_url = reverse('admin:docrepo_document_add')