[Django]-AssertionError: 301 != 200 : Couldn't retrieve redirection page

While the 302 / 301 reasoning is explained in the notes, the reason the test is failing in the first place may be because your LOGIN_URL path is missing the trailing slash:

LOGIN_URL = '/account/login/'

Without a trailing slash, django will attempt to redirect due to the default setting of APPEND_SLASH.

This will result in the test failing for the reason described.

The code for the assertRedirects method shows that the error message:

AssertionError: 301 != 200 : Couldn't retrieve redirection page '/accounts/sign_in'

is shown after the assertion method tries to follow the initial redirect to the login page. It expects the response status code to that second call to be whatever the target_status_code method parameter is set to (it defaults to 200).

You can stop the assertion error by either setting the target_status_code method parameter to 301, or by setting the parameter fetch_redirect_response=False which will stop the attempt to follow the initial redirect.